Oral pharmaceutical formulation in the form of a plurality of microcapsules for prolonged release of active principle(s) with low solubility
Abstract
The invention concerns microcapsules with prolonged release of active principles with low solubility, consisting of a core containing the active principle and coated with a polymer layer which controls the release of the active principle. The aim is that said oral microcapsules containing hardly soluble active principles, should have a coating film of sufficient thickness to ensure controlled permeability and should be adapted to industrial reproduction. This is achieved by the inventive microcapsules of mean diameter less than 1000 microns, and whereof the coating film contains a film-forming polymer (P1) insoluble in gastrointestinal tract fluids, a water-soluble polymer (P2), a plasticizer (PL), and optionally a lubricating surfactant (TA). Said microcapsules are characterized in that their coating films represents at least 3% p/p of dry matter, relative to their total weight and their core contains a hardly soluble active principle and a solubilizing agent (polyoxyethylene hydrogenated castor oil) which provides the core wherein it is contained with properties such that the behavior of the exposed core (non-coated) in a given dissolving test (TD), is as follows: release of 80% of active principle in less than two hours. The invention also concerns the use of such microcapsules in galenic formulation.

Term
Term ended
Expired 28 July 2023, 3.2 years ago.
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14 claims: 14 independent, 0 dependent
- 1Microcapsules for the modified release of at least one AP with low solubility, the water-solubility of which is less than 10 g/l at 25°C, intended to be administered orally and of the type of those:• each consisting of a core comprising at least one active principle and of a coating film applied onto the core and controlling the modified release of the AP(s),• the mean diameter of which is less than 1000 microns, preferably between 800 and 50 microns, and even more preferably between 600 and 100 microns,• in which the coating film of each microcapsule contains the following components: → -I-- at least one film-forming polymer (P1) insoluble in gastrointestinal tract fluids,→ -II-- at least one water-soluble polymer (P2),→ -III- at least one plasticizer (PL),→ -IV- and, optionally, at least one lubricating surfactant (TA) ;characterized in that: ➢ their coating film represents at least 3% dry weight/dry weight, preferably at least 5% dry weight/dry weight of their total mass,➢ their core contains at least one AP and at least one solubilizing agent having the particularity, as soon as it is placed in aqueous solution at a concentration of 20% w/w at 37°C, of increasing the solubility of the AP by more than 50%,➢ the solubilizing agent(s) present in the core with the AP confer(s), on the core in which it (they) is (are) included, properties such that the behavior of the exposed (non-coated) core in a given dissolving test TD is as follows: release of 80% of the AP in less than two hours, preferably in less than one hour. Microcapsules permettant la libération modifiée d'au moins un principe actif (PA) peu soluble dont la solubilité dans l'eau est inférieure à 10 g/l à 25°C, destinées à être administrées par voie orale et du type de celles : • constituées chacune par un coeur comportant au moins un principe actif et par une pellicule d'enrobage appliquée sur le coeur et régissant la libération modifiée du (ou des) PA,• dont le diamètre moyen est inférieur à 1000 microns, de préférence compris entre 800 et 50 microns et plus préférentiellement encore compris entre 600 et 100 microns,• dont la pellicule d'enrobage de chaque microcapsule contient les composants suivants: → -I- au moins un polymère filmogène (P1) insoluble dans les liquides du tractus gastro-intestinal ;→ -II- au moins un polymère hydrosoluble (P2) ;→ -III- au moins un plastifiant (PL) ;→ -IV- et éventuellement au moins un agent tensioactif (TA) lubrifiant ;caractérisées en ce que : ➢ leur pellicule d'enrobage représente au moins 3 % p/p sec, de préférence au moins 5% p/p sec de leur masse totale,➢ leur coeur contient au moins un PA et au moins un agent solubilisant ayant pour particularité, dès lors qu'il est mis en solution aqueuse à une concentration de 20 % p/p à 37°C, d'accroître de plus de 50% la solubilité du PA,➢ le (ou les) ageng(s) solubilisant(s) présent(s) dans le coeur avec le PA, confère(nt) au coeur dans lequel il(s) est (sont) inclus des propriétés telles que le comportement du coeur nu (non enrobé) dans un test de dissolution TD donné, est le suivant : libération de 80 % du PA en moins de deux heures, de préférence en moins d'une heure. Mikrokapseln, die eine modifizierte Freisetzung mindestens eines schlecht löslichen Wirkstoffs (PA), dessen Löslichkeit in Wasser unter 10 g/l bei 25°C liegt erlauben, darauf ausgerichtet, auf oralem Wege verabreicht zu werden, und folgender Art: - jeweils aus einem Kern bestehend, der mindestens einen Wirkstoff umfasst und mit einer Hüllschicht, die auf den Kern aufgetragen wird, und die modifizierte Freisetzung des (oder der) PA steuert,- deren mittlerer Durchmesser unter 1.000 µm liegt, vorzugsweise zwischen 800 und 50 µm liegt, und noch bevorzugter zwischen 600 und 100 µm liegt,- wobei die Hüllschicht jeder Mikrokapsel die folgenden Bestandteile enthält: I. mindestens ein filmbildendes Polymer (P1), das in den Flüssigkeiten des Gastrointestinaltrakts unlöslich ist;II. mindestens ein wasserlösliches Polymer (P2) ;III. mindestens einen Weichmacher (PL) ;IV. und gegebenenfalls mindestens ein oberflächenaktives Schmiermittel (TA) ;dadurch gekennzeichnet, dass: - ihre Hüllschicht mindestens 3 Gew.-% Trockengewicht, vorzugsweise mindestens 5 Gew.-% Trockengewicht ihrer gesamten Masse darstellt,- ihr Kern mindestens einen PA und mindestens ein Lösungsmittel enthält, das die Eigenschaft besitzt, dass es, sofern es in eine wässrige Lösung in einer Konzentration von 20 Gew.-% bei 37°C gegeben wird, die Löslichkeit des PA um mehr als 50 % erhöht,- das (oder die) Lösungsmittel, die in dem Kern zusammen mit dem PA vorhanden sind, dem Kern, in dem es/sie enthalten ist/sind, Eigenschaften, wie das Verhalten des nackten (nicht umhüllten) Kerns in einem gegebenen Auflösungstest TD verleihen, der wie folgt ist: Freisetzung von 80 % des PA in weniger als zwei Stunden, vorzugsweise weniger als einer Stunde.
- 2Microcapsules selon la revendication 1, caractérisées en ce que les composants P1, P2, PL de la pellicule d'enrobage satisfont aux caractéristiques suivantes :■ fraction massique en poids sec de P1 par rapport à la masse totale de l'enrobage, comprise entre 40 et 90 % et de préférence entre 50 et 80 %;■ fraction massique en poids sec P2/P1+P2 comprise entre 15 et 60 % et de préférence entre 15 et 55 %;■ fraction massique en poids sec PL/P1+PL comprise entre 1 et 30 % et de préférence entre 5 et 25%. Mikrokapseln gemäß Anspruch 1, dadurch gekennzeichnet, dass die Bestandteile P1, P2, PL der Hüllschicht die folgenden Eigenschaften erfüllen: Anteil des Trockenmassegewichts von P1, bezogen auf die gesamte Masse der Hülle, zwischen 40 und 90 % und bevorzugt zwischen 50 und 80 %;Anteil der Trockenmassegewichts P2/P1+P2 zwischen 15 und 60 % und vorzugsweise zwischen 15 und 55 %;Anteil des Trockenmassegewichts PL/P1+PL zwischen 1 und 30 % und vorzugsweise zwischen 5 und 25 %. The microcapsules as claimed in claim 1, characterized in that the components P1, P2 and PL of the coating film satisfy the following characteristics: ■ mass fraction by dry weight of P1 relative to the total mass of the coating of between 40 and 90%, and preferably of between 50 and 80%;■ mass fraction by dry weight P2/P1+P2 of between 15 and 60%, and preferably of between 15 and 55%;■ mass fraction by dry weight PL/P1+PL of between 1 and 30%, and preferably of between 5 and 25%.
- 3Microcapsules selon la revendication 1 ou 2, caractérisées en ce que la pellicule d'enrobage comprend du composant TA à raison de 2 à 20 % et de préférence entre 4 et 15% de la masse totale de l'enrobage sec. Mikrokapseln gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Hüllschicht den Bestandteil TA in einem Verhältnis von 2 bis 20 % und vorzugsweise zwischen 4 und 15 % der Gesamtmasse des Trockengewichts der Hüllschicht umfasst. The microcapsules as claimed in claim 1 or 2, characterized in that the coating film comprises component TA in a proportion of 2 to 20%, and preferably of between 4 and 15% of the total mass of the dry coating.
- 4Microcapsules selon l'une quelconque des revendications 1 à 3, caractérisées en ce que l'agent solubilisant est choisi parmi les familles suivantes :(a) les polymères hydrophiles, de préférence : - PolyVinylPyrrolidone,- Alcool polyVinylique,- dérivés hydrophiles de la cellulose de préférence l'hydroxypropylcellulose et/ou la-CarboxyMéthylCellulose,- Maltodextrines,- polyéthylèneglycol (PEG);(b) les tensioactifs, de préférence : - Copolymères polyoxyéthylène-polyoxypzopylène,- Huile de ricin hydrogénée polyoxyéthylènés,- SodiumDodécylSulfate,- esters de saccharose et de sorbitan,- Phospholipides,- Polyéthylène glycol(PEG)-stéarate,- Disodiumpamoate,- huiles polyoxyéthylénées,- polysorbates;(c) ou encore parmi les séquestrants, de préférence les cyclodextrines ;(d) et leurs mélanges. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Lösungsmittel aus den folgenden Familien ausgewählt ist: (a) hydrophilen Polymeren, vorzugsweise: Polyvinylpyrrolidon,Polyvinylalkohol,hydrophile Cellulosederivate, vorzugsweise derHydroxypropylcellulose und/oder derCarboxymethylcellulose,Maltodextrine,Polyethylenglycol (PEG);(b) Tensiden, vorzugsweise: Polyoxyethylen-Polypropylen-Copolymeren, hydrogeniertes polyoxyethyleniertes Rizinöl,Natriumdodecylsulfat,Sorbitansaccharoseester,Phospholipide,Polyethylenglycol-(PEG)-stearat,Dinatriumpamoat,polyoxyethylenierte Öle,Polysorbate;(c) oder aus Komplexbildnern, vorzugsweise Cyclodextrin;(d) und ihren Gemischen. The microcapsules as claimed in any one of claims 1 to 3, characterized in that the solubilizing agent is chosen from the following families: (a) hydrophilic polymers, preferably: - polyvinyl pyrrolidone,- polyvinyl alcohol,- hydrophilic derivatives of cellulose, preferably hydroxypropylcellulose and/or carboxymethylcellulose,- maltodextrins,- polyethylene glycol (PEG) ;(b) surfactants, preferably: - polyoxyethylene-polyoxypropylene copolymers,- polyoxyethylenated hydrogenated castor oil,- sodium dodecyl sulfate,- esters of sucrose and of sorbitan,- phospholipids,- polyethylene glycol (PEG) stearate,- disodium pamoate,- polyoxyethylenated oils,- polysorbates;(c) or else from sequestering agents, preferably cyclodextrins;(d) and mixtures thereof.
- 5Microcapsules selon l'une quelconque des revendications 1 à 4, caracterisées en ce que la fraction massique [agent solubilisant] x 100/ [agent solubilisant + PA] est supérieure ou égale à 5 % et de préférence comprise entre 10 et 98%. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Masseanteil (Lösungsmittel) x 100/(Lösungsmittel + PA) über oder gleich 5 % ist und vorzugsweise zwischen 10 und 98 % liegt. The microcapsules as claimed in any one of claims 1 to 4, characterized in that the mass fraction [solubilizing agent] x 100/ [solubilizing agent + AP] is greater than or equal to 5%, and preferably between 10 and 98%.
- 6Microcapsules selon l'une quelconque des revendications 1 à 5, caractérisées en ce que P1 est sélectionné dans le groupe de produits suivants:• les dérivés non hydrosolubles de la cellulose, de préférence l'éthylcellulose et/ou l'acétate de cellulose,• les dérivés acryliques,• les polyvinylacétates,• et leurs mélanges. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass P1 aus der Gruppe der folgenden Produkte ausgewählt ist: wasserunlösliche Cellulosederivate, vorzugsweise Ethylcellulose und/oder Celluloseacetat, Acrylderivate,Polyvinylacetate,und deren Gemische. The microcapsules as claimed in any one of claims 1 to 5, characterized in that P1 is selected from the group of products below: • water-insoluble derivatives of cellulose, preferably ethylcellulose and/or cellulose acetate,• acrylic derivatives,• poly(vinyl acetates),• and mixtures thereof.
- 7Microcapsules selon l'une quelconque des revendications 1 à 6, caractérisées en ce que P2 est sélectionné dans le groupe de produits suivants:• les dérivés hydrosolubles de la cellulose,• les polyacrylamides,• les poly-N-vinylamides,• les poly-N-vinyl-lactames,• les alcools polyvinyliques (APV),• les Pelyoxyéthylènes (POE),• les polyvinylpyrrolidones (PVP) (ces dernières étant préférées),• et leurs mélanges. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass P2 aus der Gruppe der folgenden Produkte ausgewählt ist: wasserlöslichen Cellulosederivaten,Polyacrylamiden,Poly-N-vinylamiden,Poly-N-vinyllactamen,Polyvinylalkoholen (PVA),Polyoxyethylenen (POE),Polyvinylpyrrolidonen (PVP) (die letztgenannten sind bevorzugt), und deren Gemischen. The microcapsules as claimed in any of one of claims 1 to 6, characterized in that P2 is selected from the group of products below: • water-soluble derivatives of cellulose,• polyacrylamides,• poly-N-vinylamides,• poly(N-vinyl lactams),• polyvinyl alcohols (PVAs),• polyoxyethylenes (POEs),• polyvinylpyrrolidones (PVPs) (the latter being preferred),• and mixtures thereof.
- 8Microcapsules selon l'une quelconque des revendications 1 à 7, caractérisées en ce que PL est sélectionné dans le groupe de produits suivants:• le glycérol et ses esters, de préférence dans le sous-groupe suivant: glycérides acétylés, glycérolmonostéarate, glycéryltriacétate, glycéroltributyrate,• les phtalates, de préférence dans le sous-groupe suivant : dibutylphthalate, diéthylphthalate, diméthylphthalate, dioctyl-phthalate,• les citrates, de préférence dans le sous-groupe suivant : acétyltributylcitrate, acétyltriéthylcitrate, tributylcitrate, triéthyl-citrate,• les sébaçates, de préférence dans le sous-groupe suivant: diéthylsébaçate, dibutylsébaçate,• les adipates,• les azélates,• les benzoates,• les huiles végétales,• les fumarates de préférence le diéthylfumarate,• les malates;de préférence le diéthylmalate,• les oxalates, de préférence le diéthyloxalate,• les succinates;de préférence le dibutylsuccinate,• les butyrates,• les esters de l'alcool cétylique,• l'acide salicylique,• la triacétine,• les malonates, de préférence le diéthylmalonate,• la cutine,• l'huile de ricin (celle-ci étant particulièrement préférée),• et leurs mélanges. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass PL ausgewählt ist aus der Gruppe der folgenden Produkte: Glycerol und dessen Estern, vorzugsweise aus der folgenden Untergruppe: acetylierte Glyceride, Glycerolmonostearat, Glyceryltriacetat, Glyceroltributyrat,den Phthalaten, vorzugsweise aus der folgenden Untergruppe: Dibutylphthalat, Diethylphthalat, Dimethylphthalat, Dioctylphthalat,den Citraten, vorzugsweise aus der folgenden Untergruppe: Acetyltributylcitrat, Acetyltriethylcitrat, Tributylcitrat, Triethylcitrat,den Sebacaten, vorzugsweise aus der folgenden Gruppe: Diethylsebacat, Dibutylsebacat,den Adipaten,den Azelaten,den Benzoaten,den Pflanzenölen,den Fumaraten, vorzugsweise Diethylfumarat,den Malaten, vorzugsweise Diethylmalat,den Oxalaten, vorzugsweise Diethyloxalat,den Succinaten, vorzugsweise Dibutylsuccinat,den Butyraten,den Cetylalkoholestern,der Salicylsäure,dem Triacetin,den Malonaten, vorzugsweise Diethylmalonat,dem Cutin,Rizinöl (dieses ist besonders bevorzugt), und ihren Gemischen. The microcapsules as claimed in any one of claims 1 to 7, characterized in that PL is selected from the group of products below: • glycerol and esters thereof, preferably from the following subgroup: acetylated glycerides, glyceryl monostearate, glyceryl triacetate, glyceryl tributyrate,• phthalates, preferably from the following subgroup: dibutyl phthalate, diethyl phthalate, dimethyl phthalate, dioctyl phthalate,• citrates, preferably from the following subgroup: acetyl tributyl citrate, acetyl triethyl citrate, tributyl citrate, triethyl citrate,• sebacates, preferably from the following subgroup: diethyl sebacate, dibutyl sebacate,• adipates,• azelates,• benzoates,• plant oils,• fumarates, preferably diethyl fumarate,• malates, preferably diethyl malate,• oxalates, preferably diethyl oxalate,• succinates, preferably dibutyl succinate,• butyrates,• cetyl alcohol esters,• salicylic acid,• triacetin,• malonates, preferably diethyl malonate,• cutin,• castor oil (this being particularly preferred),• and mixtures thereof.
- 9Microcapsules selon l'une quelconque des revendications 1 à 8, caractérisées en ce que TA est sélectionné dans le groupe de produits suivants:• les tensioactifs anioniques, de préférence dans le sous-groupe des sels alcalins ou alcalinoterreux des acides gras, l'acide stéarique et/ou oléique étant préférés,• et/ou les tensioactifs non ioniques, de préférence dans le sous-groupe suivant: o les huiles polyoxyéthyiénées de préférence l'huile de ricin hydrogénée polyoxyéthylénée,o les copolymères polyoxyéthylène-polyoxypropylène,o les esters de sorbitan polyoxyéthylénés,o les dérivés de l'huile de ricin polyoxyéthylénés,o les stéarates, de préférence de calcium, de magnésium, d'aluminium ou de zinc,o les stéarylfumarates, de préférence de sodium,o le béhénate de glycérol,o et leurs mélanges. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass TA aus der folgenden Produktgruppe ausgewählt ist: den anionischen Tensiden, vorzugsweise aus der Untergruppe Alkalisalzen oder Erdalkalisalzen der Fettsäuren, wobei Stearinsäure und/oder Oleinsäure bevorzugt sind,und/oder den nichtionischen Tensiden, vorzugsweise aus der folgenden Untergruppe: polyoxyethylenierten Ölen, vorzugsweise polyoxyethyliertem hydrogeniertem Rizinöl, den Polyoxyethylen-Polyoxypropylen-Copolymeren,den Polyoxyethylensorbitanestern,den Derivaten des polyoxyethylenierten Rizinöls,den Stearaten, vorzugsweise von Calcium, Magnesium, Aluminium oder Zink,den Stearylfumaraten, vorzugsweise des Natriums,dem Glycerolbenenat,und deren Gemischen. The microcapsules as claimed in any one of claims 1 to 8, characterized in that TA is selected from the group of products below: • anionic surfactants, preferably from the subgroup of alkali metal salts or alkaline-earth metal salts of fatty acids, stearic acid and/or oleic acid being preferred,• and/or nonionic surfactants, preferably from the following subgroup: o polyoxyethylenated oils, preferably polyoxyethylenated hydrogenated castor oil,o polyoxyethylene-polyoxypropylene copolymers,o polyoxyethylenated sorbitan esters,o polyoxyethylenated castor oil derivatives,o stearates, preferably calcium stearate, magnesium stearate, aluminum stearate or zinc stearate,o stearyl fumarates, preferably sodium stearyl fumarate,o glyceryl behenate,o and mixtures thereof.
- 10Microcapsules selon l'une quelconque des revendications 1 à 9, caractérisées en ce que les PA peu solubles sont choisis parmi au moins l'une des grandes variétés de substances actives suivantes :antiulcéreux, antidiabétiques, anticoagulants, antithrombiques, hypo-lipémiants, antiarythmiques, vasodilatateurs, antiangineux, antihypertenseurs, vasoprotecteurs, promoteurs de fécondité, inducteurs et inhibiteurs du travail utérin, contraceptifs, antibiotiques, antifongiques, antiviraux, anticancéreux, anti-inflammatoires, analgésiques, antiépileptiques, antiparkinsoniens, neuroleptiques, hypnotiques, anxiolytiques, psychostimulants, antimigraineux, antidépresseurs, antitussifs, antihistaminiques ou antiallergiques. Mikrokapseln gemäß irgendeinem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die schlecht löslichen PA ausgewählt sind aus mindestens einer der großen Anzahl an folgenden Wirkstoffen: Antiulcerativa, Antidiabetika, Antikoagulanzien, Antithrombotika, Fettsenkern, Antiarythmiemitteln, Vasodilatatoren, Mitteln gegen Angina, Mitteln gegen Hochdruck, gefäßschützenden Mitteln, Fertilitäts-fördernden Mitteln, Förderern oder Inhibitoren von Wehen, Kontrazeptiva, Antibiotika, Antifungiziden, Antivirusmitteln, Antikrebsmitteln, Anti-Entzündungsmitteln, Analgetika, Antiepileptika, Anti-Parkinson-Mitteln, Neuroleptika, Hypnotika, Anxiolytika, Psychostimulanzien, Anti-Migräne-Mittel, Antidepressiva, Antitussiva, Antihistaminika oder Antiallergika. The microcapsules as claimed in any one of claims 1 to 9, characterized in that the APs with low solubility are chosen from at least one of the major varieties of active substances below: antiulcer agents, antidiabetic agents, anticoagulants, antithrombics, blood lipid-lowering agents, anti-arrhythmics, vasodilators, antiangina agents, antihypertensives, vasoprotective agents, fertility promoters, inducers and inhibitors of uterine labor, contraceptives, antibiotics, antifungal agents, antiviral agents, anticancer agents, anti-inflammatories, analgesics, antiepileptics, antiparkinsonian agents, neuroleptics, hypnotics, anxiolytics, psychostimulants, antimigraine agents, antidepressives, antitussives, antihistamines or antiallergic agents.
- 11Microcapsules selon la revendication 10, caractérisées en ce que le (ou les) PA peu soluble(s) est (sont) choisi(s) parmi les composés suivants :prazosine, acyclovir, nifedipine, naproxen, ibuprofen, ketoprofen, fenoprofen, indométhacine, diclofenac, sulpiride, terfenadine, carbamazepine, fluoxétine, alprazolam, famotidine, ganciclovir, spironolactone, acide acétylsalycilique, quinidine, morphine, amoxicilline, paracétamol, métoclo-pramide, vérapamil et leurs mélanges. Mikrokapseln gemäß Anspruch 10, dadurch gekennzeichnet, dass der (oder die) schwach lösliche(n) PA ausgewählt sind aus den folgenden Verbindungen: Prazosin, Acyclovir, Nifedipin, Naproxen, Ibuprofen, Ketoprofen, Fenoprofen, Indomethacin, Diclofenac, Sulpiridin, Terfenadin, Carbamazepin, Fluoxetin, Alprazolam, Famotidin, Gancyclovir, Spironolacton, Acetylsalicylsäure, Chinidin, Morphin, Amoxicillin, Paracetamol, Metoclopramid, Verapamil und ihren Gemischen. The microcapsules as claimed in claim 10, characterized in that the AP(s) with low solubility is (are) chosen from the following compounds: prazosine, acyclovir, nifedipine, naproxen, ibuprofen, ketoprofen, fenoprofen, indomethacine, diclofenac, sulpiride, terfenadine, carbamazepine, fluoxetine, alprazolam, famotidine, ganciclovir, spironolactone, acetylsalicyclic acid, quinidine, morphine, amoxicillin, paracetamol, metoclopramide, verapamil and mixtures thereof.
- 13Medikament gemäß Anspruch 12, dadurch gekennzeichnet, dass es in fester Form vorliegt, vorzugsweise:Tablette, Kapsel oder Pulver, oder in flüssiger Form, vorzugsweise in wässriger Suspension. Médicament selon la revendication 12, caractérisé en ce qu'il est sous forme solide de préférence : comprimé, gélule ou poudre, ou sous forme liquide, de préférence : suspension aqueuse. The medicinal product as claimed in claim 12, characterized in that it is in solid form, preferably: tablet, gelatin capsule or powder, or in liquid form, preferably: an aqueous suspension.
- 14The use of microcapsules:• each consisting of a core comprising at least one active principle and of a coating film applied onto the core and controlling the prolonged release of the AP(s),• the mean diameter of which is less than 1000 microns, preferably between 800 and 50 microns, and even more preferably between 600 and 100 microns,• in which the coating film of each microcapsule contains the following components: → -I-- at least one film-forming polymer (P1) insoluble in gastrointestinal tract fluids,→ -II-- at least one water-soluble polymer (P2),→ -III- at least one plasticizer (PL),→ -IV- and, optionally, at least one lubricating surfactant (TA);characterized in that: ➢ their coating film represents at least 4% dry weight/dry weight, preferably at least 5% dry weight/dry weight of their total mass,➢ their core contains at least one AP and at least one solubilizing agent having the particularity, as soon as it is placed in aqueous solution at a concentration of 20% w/w at 37°C, of increasing the solubility of the AP by more than 50%,➢ the solubilizing agent(s) present in the core with the AP confer(s), on the core in which it (they) is (are) included, properties such that the behavior of the exposed (non-coated) core in a given dissolving test TD is as follows: release of 80% of the AP in less than two hours, preferably in less than one hour, for producing a medicinal product based on at least one AP with low solubility, the water-solubility of which is less than 10 g/l at 25, which can be administered orally, which can be readily swallowed, and which is released in vivo in a controlled, prolonged and, optionally, delayed manner. Utilisation de microcapsules : • constituées chacune par un coeur comportant au moins un principe actif et par une pellicule d'enrobage appliquée sur le coeur et régissant la libération prolongée du (ou des) PA,• dont le diamètre moyen est inférieur à 1000 microns, de préférence compris entre 800 et 50 microns et plus préférentiellement encore compris entre 600 et 100 microns,• dont la pellicule d'enrobage de chaque microcapsule contient les composants suivants : → -I-- au moins un polymère filmogène (P1) insoluble dans les liquides du tractus gastro-intestinal;→ -II- au moins un polymère hydrosoluble (P2) ;→ -III- au moins un plastifiant (PL);→ -IV- et éventuellement au moins un agent tensioactif (TA) lubrifiant ;caractérisées en ce que : ➢ leur pellicule d'enrobage représente au moins 4 % p/p sec, de préférence au moins 5 % p/p sec de leur masse totale,➢ leur coeur contient au moins un PA et au moins un agent solubilisant ayant pour particularité, dès lors qu'il est mis en solution aqueuse à une concentration de 20 % p/p à 37°C, d'accroître de plus de 50% la solubilité du PA,➢ le (ou les) agent(s) solubilisant(s) présent(s) dans le coeur avec le PA, confère(nt) au coeur dans lequel il(s) est (sont) inclus des propriétés telles que le comportement du coeur nu (non enrobé) dans un test de dissolution TD donné, est le suivant : libération de 80 % du PA en moins de deux heures, de préférence en moins d'une heure, pour fabriquer un médicament à base d'au moins un PA peu soluble dont la solubilité dans l'eau est inférieure à 10 g/l à 25°C, et administrable par voie orale, avalable aisément et qui se libère in vivo de manière contrôlée, prolongée, et éventuellement retardée. Verwendung von Mikrokapseln: jeweils aus einem Kern, der mindestens einen Wirkstoff umfasst, und einer Hüllschicht gebildet, die auf den Kern aufgetragen ist, und die verlängerte Freisetzung des (oder der) PAs reguliert,wobei der mittlere Durchmesser unter 1.000 µm liegt, vorzugsweise zwischen 800 und 50 µm liegt und noch bevorzugter zwischen 600 und 100 µm liegt,wobei die Hüllschicht jeder Mikrokapsel die folgenden Bestandteile enthält: I. mindestens ein filmbildendes Polymer (P1), welches in den Flüssigkeiten des Gastrointestinaltrakts unlöslich ist;II. mindestens ein wasserlösliches Polymer (P2);III. mindestens einen Weichmacher (PL);IV. und gegebenenfalls mindestens ein tensioaktives Schmiermittel (TA) ;dadurch gekennzeichnet, dass ihre Hüllschicht mindestens 4 % des Trockengewichts ausmacht, vorzugsweise mindestens 5 % des Trockengewichts ihrer gesamten Masse, ihr Kern mindestens ein PA und mindestens ein Lösungsmittel enthält, das die Eigenschaft besitzt, dass es, wenn es in eine wässrige Lösung in einer Konzentration von 20 Gew.-% bei 37°C gegeben wird, die Löslichkeit des PA um mehr als 50 % erhöht, das (oder die) Lösungsmittel, das (die) in dem Kern mit dem PA vorhanden sind dem Kern, in dem er/sie enthalten ist/sind die Eigenschaften des nackten Kerns (nicht umhüllt) in einem gegebenen Auflösungstest verleihen, welcher wie folgt ist: Freisetzung von 80 % des Wirkstoffs in weniger als zwei Stunden, vorzugsweise weniger als einer Stunde, zur Herstellung eines Medikaments auf Grundlage mindestens eines schlecht löslichen PA, dessen Löslichkeit in Wasser unter 10 g/l bei 25°C liegt, und auf oralem Wege verabreichbar ist, leicht schluckbar ist, und sich in vivo in kontrollierter Form, verlängerter Form und gegebenenfalls verzögerter Form freisetzt.
Independent claims14
104 paragraphs in 1 section, as filed
The field of the invention is that the modified release of active principles (AP) Pharmaceutical low solubility.
In this disclosure, the expression <i>"Modified release"</i> means either a release (or) principle (s) active (s) starting from the contact of the dosage form with the dissolution medium (in vivo or in vitro) or even a release (or) principle (s) active (s) beginning only after a predetermined period of, for example 0.5 to several hours. Thus the meaning of the invention, an extension of the release corresponds to a release time of 50% (or more) ingredient (s) active (s) that is typically several hours and can range from 0, from 25 to 20 hours, for example.
The term "<i>low solubility "</i> refers to active ingredients whose solubility in water is less than 10 g / l at 25 ° C.
More specifically, the invention relates to pharmaceutical sustained release formulations of active ingredients of low solubility, this formulation consisting of a plurality of microcapsules consist of a core containing the active ingredient of low solubility and coated with a polymer layer which controls the release of the AP.
Of the various modified release systems, the dosage modified release systems consisting of a plurality of reservoir-type microcapsules of average diameter less than 1000 microns, are particularly advantageous. Indeed, in these systems, the principle of dose (s) active (s) to be administered is distributed among large number of microcapsules (typically 10,000 for a dose of 500 mg and a diameter of 400 microns) and such type of system, therefore, the following intrinsic advantages:<ul><li>The implementation of a mixture of microcapsules release profiles of different modified permits to produce release profiles having several waves of release or ensuring, by appropriate adjustment of the different fractions, a level of constant plasma concentration PA;</li><li>the sensitivity to the variability in gastric emptying is reduced because the emptying, which takes place over a large number of particles, is statistically more reproducible;</li><li>Avoids contacting the fabrics with a high dose of AP "dose dumping". Each microcapsule in fact contains only a very small dose in principle (s) active (s). Is thus avoided the risk of tissue damage by local over-concentration principle (s) active (s) aggressive;</li><li>It is possible to combine multiple dosage forms (immediate and / or delayed and / or prolonged) having one or more active ingredients in these "multimicrocapsular" systems;</li><li>it does not induce degradation of PA;</li><li>The residence time of the microcapsules in the upper parts of the tract can be prolonged, which ensures an increase in the duration of passage (or) principle (s) active (s) to the absorption windows and thus maximizes the bioavailability the (or) principle (s) active (s).</li></ul>
In case, however, the solubility of the AP is low, the production of a microparticulate modified-release form comes up against a major difficulty.
Diffusion of the active ingredient through the coating film surrounding each microcapsule is carried out under the influence of concentration gradient in dissolved AP between the inside and outside of the microcapsule. In other words, it is the osmotic pressure difference AP between the inside and outside of the microcapsule which is driving the release. The internal concentration of AP is the saturation concentration. The external concentration of AP is itself negligible in usual conditions (called "sink"). The release engine is therefore directly related to the saturation concentration of the AP, ie to its solubility.
For APs with low solubility, the saturation concentration of AP is low and the diffusion of the AP outward is a priori very slow, even for very thick coating films.
And anyway, for coating films of small thicknesses are encountered the following difficulties:<ol><li>(A) The filing of a coating film of very small thickness is not uniform: gaps alongside areas of extra thickness, and the release of the AP is not extended.</li><li>(B) The industrial control process for depositing a very thin becomes very difficult and poorly reproducible.</li></ol>
Moreover, for thicker coating films, the release of the AP is extremely slow or nonexistent.
The difficulty in modifying the release of an AP with low solubility explains the small number of technical solutions that have been proposed to date.
As regards pharmaceutical systems, solids, multimicrocapsular discloses those composed of a multiplicity of particles or microcapsules each carrying principle (s) active (s) coated with a film-coating layer based on ethyl cellulose, polyvinylpyrrolidone, magnesium stearate and castor oil, for example. Such dosage system is disclosed in the PCT application<patcit id="pcit0001" dnum="WO9611675A"><text>WO-96/11675</text></patcit>. These microcapsules reservoir derive from their multiplicity an advantage, which is a gastric emptying time more uniform and reproducible. Furthermore, their size between 50 and 1000 microns and the characteristics of their coating enhances their transit time in the upper parts of the gastrointestinal tract and, consequently, to maintain the absorption principle (s ) active (s) during all or part of the residence time in the small intestine. But the pharmaceutical system according multimicrocapsular<patcit id="pcit0002" dnum="WO9611675A"><text>WO-96/11675</text></patcit> be improved regarding the PA poorly soluble orally administrable because it does not offer a solution to the problem of the spread of such poorly soluble PA through a coating film of sufficiently large thickness, eg of several microns.
Regarding the prior art on microcapsules with modified release of active principle sparingly soluble, it should first of all mention the PCT Patent Application <patcit id="pcit0003" dnum="WO9949846A"><text>WO 99/49846</text></patcit> which discloses a pharmaceutical preparation consisting of submicronic particles (0.05 to 10 .mu.m) combining an active principle with low solubility with a phospholipid compound, a compound modifying the surface charges and a polymer block. This preparation aims to improve the bioavailability and stability of the active ingredient and has applications in injectable forms or to be administered by ocular or nasal route. A sustained release form is only obtained in the case of intramuscular injection.
PCT patent application <patcit id="pcit0004" dnum="WO0018374A"><text>WO-00/18374</text></patcit> describes an invention of the same nature as the previous one: the active ingredient in the form of submicronic particles (<1000 nm) is stabilized by a compound associated with the particle surface and mixed with a polymer. This mixture can then be formed into granules or pellets and optionally compressed. The active ingredient is quickly dissolved and this is increasing the bioavailability obtained through allowing downsizing of having an effective plasma concentration over an extended period.
The patent application <patcit id="pcit0005" dnum="GB2202143A"><text>GB-2,202,143</text></patcit> describes spheroids of diameter greater than 0.5 mm and preferably greater than 0.8 mm, containing the poorly soluble active agent dispersed in 70 to 99.5% microcrystalline cellulose. This matrix form requires no coating controlling the release of active ingredient.
The patent application <patcit id="pcit0006" dnum="JP8073345B"><text>JP-8073345</text></patcit> discloses a controlled release system consisting of a coated granule. The granulate contains a sparingly soluble active ingredient at neutral pH and inorganic acids. This system offers a suitable solution only in case of poorly soluble basic active principles.
Finally, European Patent <patcit id="pcit0007" dnum="EP0249587B"><text>EP-B-0249587</text></patcit> relates to a solid preparation for slow release of an active substance poorly soluble (<0.1% by weight). This controlled release formulation may be in the form of capsules comprising capsules consisting of coated granules. Granules comprise the active principle with low solubility and a solubilizing constituted by the commercial product Cremophor RH 40 (polyethoxylated hydrogenated castor oil: 40 ethylene oxide units) and other additives such as polyvinylpyrrolidone, cellulose, starch and lactose. These granule size between 700 and 1120 microns are coated with an ethylcellulose coating layer for controlling the release. The ingredients of the granules that are polyvinylpyrrolidone, cellulose, corn starch and lactose, seem to be the elements of the own hydrophilic gel system in the dosage form according to the<patcit id="pcit0008" dnum="EP0249587B"><text>EP-B-0249587</text></patcit>. These capsules therefore comprise only one component (ethyl cellulose) in their coating layer, which limits its capacity for modifying the release of the active ingredient. In particular, it is doubtful that a coating layer composed solely of ethyl cellulose (known to form impermeable films), allows the release of an AP with low solubility in a controlled manner and industrially reproducible over a period of several hours , for example.
None of these patent applications describes reservoir type of microparticles or microcapsules for which sustained release of the active ingredient poorly soluble is controlled by diffusion through a membrane having a thickness sufficient to ensure a controlled and industrially reproducible permeability. They do not teach either how to achieve such a system.
Before this emptiness of the prior art, one of the essential objectives of the present invention to provide a modified release forms of AP with low solubility (s) consists of a plurality of microcapsules, each formed by a core containing the AP and coated with a coating film.
Another object of the present invention is to provide a plurality of AP microcapsules of reservoir type of low solubility, for oral administration of this (or these) last (s), the coating film of these microcapsules having a thickness sufficient to ensure a controlled and industrially reproducible permeability.
Another essential object of the present invention is to provide a plurality of sparingly soluble AP microcapsules (s) of less than 1000 microns in size.
Another object of the present invention to provide an oral dosage form and consists of a large number (for example of the order of several thousand) of microcapsules, this multiplicity statistically ensuring good reproducibility of the transit kinetics of PA in throughout the gastrointestinal tract, so that it results in a better control of the bioavailability and therefore better efficiency.
Another essential object of the present invention is to provide a plurality of microcapsules of AP with low solubility (s) for the oral administration of this (these) last (s) in a sustained release profile and / or optionally delayed so that the half-release t<sub>1/2</sub> is between 0.25 and 20 hours.
Another essential object of the present invention is to provide an oral modified release in which it (or them) PA is (are) as a plurality of particles individually coated to form microcapsules and in which it is possible to mix more multimicrocapsular active ingredients in form, released under different respective release times.
Having set themselves all the above objectives, among others, the inventors had the merit of developing a multimicrocapsular pharmaceutical system with prolonged release of APs with low solubility:<ul><li>which allows to adjust the half-release time of the AP between 0.25 and 20 pm</li><li>that is reproducible and easy to implement industrially with a ratio of the mass of the coating film to the mass of the particle, greater than 3% w / w dry, preferably greater than 5% w / w dry, and even more preferably between 3 and 40% w / w dry.</li></ul>
To do this, the inventors had the merit to discover after many tests of particular structure of microcapsules that can meet the aims stated above, among others.
Thus, the invention relates to microcapsules for the modified release of at least one AP with low solubility, to be administered orally and of the type:<ul><li>each consist of a core comprising at least one active principle and of a coating film applied onto the core and controlling the prolonged release of the (or) PA,</li><li>whose average diameter is less than 1000 microns, preferably between 800 and 50 microns and more preferably still between 600 and 100 microns,</li><li>in which the coating film of each microcapsule contains the following components: <ul><li>→ -I-- at least one film-forming polymer (P1) insoluble in the fluids of the gastrointestinal tract</li><li>→ -II-- at least one water-soluble polymer (P2)</li><li>→ -III-at least unp1astifiant (PL)</li><li>→ -IV- and optionally at least one surfactant (SA) lubricant;</li></ul></li></ul>characterized in that:<ul><li>➢ their coating film represents at least 3% w / dry w, preferably at least 5% w / w dry of their total mass,</li><li>➢ their core contains at least one AP and at least one solubilizing agent having the particularity, as soon as it is placed in aqueous solution at a concentration of 20% w / w at 37 ° C, increase of more than 50% the solubility of the AP.</li><li>➢ the (or) agent (s) solubilizing (s) present (s) in the core with the AP confer (s) in the heart in which (s) is (are) included such properties as the core behavior bare (uncoated) in a given dissolving test TD defined in the below examples, is as follows: release of 80% of the AP in less than two hours, preferably in less than one hour.</li></ul>
It is interesting to note that the original structure of microcapsules with a core comprising a solubilizing agent and a coating based on P1 / P2 / PL / (TA), is designed to significantly improve the solubility of the AP in aqueous solution. To achieve this, the microcapsules according to the invention are indeed made so that they facilitate the wetting of the surface of the crystals of the AP by water.
The solubility of active ingredient is measured, for example by introducing the PA in an aqueous solution containing solubilizing agent. The solution was stirred at 37 ° C for 6 hours then filtered through a filter of 0.2 .mu.m pore diameter. The content of solubilized AP is evaluated by HPLC or other suitable analytical technique.
Preferably, the components P1, P2 and PL of the coating film satisfy the following characteristics:<ul><li>■ mass fraction by dry weight of P1 relative to the total mass of the coating of between 40 and 90% and preferably between 50 and 80%;</li><li>■ mass fraction by dry weight P2 / P1 + P2 of between 15 and 60% and preferably between 15 and 55%;</li><li>■ mass fraction by dry weight PL / P1 + PL of between 1 and 30% and preferably between 5 and 25%.</li></ul>
According to an advantageous variant, the coating film comprises component TA in a proportion of 2 to 20% and preferably between 4 and 15% of the total mass of the dry coating.
Preferably, the coating film is 3 to 40% w / w dry total mass of the microcapsules.
In accordance with preferred methods for carrying out the invention, the core containing the AP and the solubilizing agent may have either of the following structures:
A structure
The core consists of a microbead approved for chronic oral administration, consisting for example and without limitation, derivatives of cellulose and / or hydrophilic compounds such as sucrose and / or dextrose, etc. This neutral core is covered by a layer comprising a mixture of AP and at least one solubilizing agent as defined below.
structure B
The core is composed of a single crystal of PA coated with a layer containing the solubilizer defined below.
structure C
The core is a granule composed of the mixture of PA, of one or more granulation excipients known to those skilled in the art and one or more solubilizing agents defined below.
Besides the fact that they solve the technical problem underlying the invention, one of the many advantageous features such solubilizing agents is that they belong to the family of pharmaceutical excipients approved for chronic oral administration, by most authorities on the subject in the world.
Additionally, these solubilizers are selected such that they do not induce degradation of the AP.
These solubilizing agents are preferably chosen without limitation from the following families:<ol><li>(A) hydrophilic polymers, preferably:<ul><li>polyvinylpyrrolidone,</li><li>Polyvinyl alcohol,</li><li>hydrophilic cellulose derivatives, preferably hydroxypropylcellulose and / or carboxymethylcellulose,</li><li>maltodextrins,</li><li>polyethyleneglycol (PEG);</li></ul></li><li>(B) surfactants, preferably:<ul><li>Polyoxyethylene-polyoxypropylene copolymers,</li><li>polyoxyethylene hydrogenated castor oil,</li><li>SodiumDodécylSulfate,</li><li>esters of sucrose and of sorbitan,</li><li>phospholipids,</li><li>polyethylene glycol (PEG) -stearate,</li><li>Disodiumpamoate,</li><li>polyoxyethylenated oils,</li><li>polysorbates;</li></ul></li><li>(C) or else from sequestering agents, preferably cyclodextrins;</li><li>(D) and mixtures thereof.</li></ol>
According to a preferred feature of the invention, the mass fraction [solubilizing agent] x 100 / [solubilizing agent + AP] is greater than or equal to 5% and preferably between 10 and 98%.
Preferably P1 is selected from the group of following products:<ul><li>water-insoluble derivatives of cellulose, preferably ethylcellulose and / or cellulose acetate,</li><li>acrylic derivatives,</li><li>polyvinyl acetates,</li><li>and mixtures thereof.</li></ul>
Preferably, P2 is selected from the group of following products:<ul><li>water-soluble derivatives of cellulose,</li><li>polyacrylamides,</li><li>poly-N-vinylamides,</li><li>poly-N-vinyl lactams,</li><li>polyvinyl alcohol (PVA)</li><li>polyoxyethylenes (POE)</li><li>polyvinylpyrrolidones (PVP) (the latter being preferred)</li><li>and mixtures thereof.</li></ul>
Preferably, PL is selected from the group of following products:<ul><li>glycerol and its esters, preferably from the following subgroup: acetylated glycerides, glycérolmono-stearate, glyceryl triacetate, glyceryl tributyrate, </li><li>phthalates, preferably from the following subgroup: dibutyl phthalate, diethyl phthalate, dimethyl, dioctylphthalate,</li><li>citrates, preferably from the following subgroup: acetyl, acetyltriethylcitrate, tributylcitrate, triethylcitrate,</li><li>sebacates, preferably from the following subgroup: diethyl, dibutyl,</li><li>adipates,</li><li>azelates,</li><li>benzoates,</li><li>vegetable oils,</li><li>of the fumarates,</li><li>malates, preferably diethyl,</li><li>oxalates, preferably diethyl,</li><li>succinates; preferably dibutyl,</li><li>butyrates,</li><li>esters of cetyl alcohol,</li><li>salicylic acid,</li><li>triacetin,</li><li>malonates, preferably diethyl malonate,</li><li>cutin,</li><li>castor oil (this being particularly preferred),</li><li>and mixtures thereof.</li></ul>
Preferably, TA is selected from the group of following products:<ul><li>anionic surfactants, preferably from the subgroup of alkali or alkaline earth salts of fatty acids, stearic and / or oleic acid being preferred,</li><li>and / or nonionic surfactants, preferably from the following subgroup:<ul><li>polyoxyethylenated oils, preferably polyoxyethylenated hydrogenated castor oil,</li><li>o polyoxyethylene-polyoxypropylene copolymers,</li><li>o polyoxyethylenated sorbitan esters,</li><li>o polyoxyethylenated derivatives of castor oil,</li><li>o stearates, preferably calcium, magnesium, aluminum or zinc,</li><li>o stéarylfumarates, preferably sodium,</li><li>o glyceryl behenate,</li><li>and mixtures thereof.</li></ul></li></ul>
The preparation according to the invention allows a multimicrocapsular form with modified release of APs with low solubility, the PA of the half-release time can be adjusted between 0.25 and 20 hours in a reproducible manner through the use of a film coating that can be called diffusion coating film, thick enough.
In addition, for sparingly soluble AP whose absorption window is limited, such a plurality of microcapsules (typically 10,000 for a dose of 500 mg and an average diameter of 400 microns) has the following intrinsic advantages:<ul><li>The implementation of a mixture of delayed release profiles of the microcapsules and various controlled, allows to produce release profiles having several waves of release or ensuring, by appropriate adjustment of the different fractions, a constant level of plasma concentration of AP</li><li>The variability of gastric emptying is reduced because the emptying, which takes place over a large number of particles, is statistically more reproducible.</li><li>contacting tissue is avoided with a high dose of AP <i>"Dose dumping".</i> Each microcapsule in fact contains only a very small dose of AP. Is thus avoided the risk of tissue damage by local over-concentration of aggressive AP.</li><li>The residence time of the microcapsules in the upper parts of the tract can be prolonged, which ensures an increase in the AP residence time before the absorption windows and thus maximizes the bioavailability of the AP.</li></ul>
APs with low solubility used for the preparation of microcapsules with modified release, preferably controlled, according to the invention may be chosen from at least one of the major varieties of active substances:<ul><li>antidiabetic agents, anticoagulants, antithrombotic, hypo-lipémiants, antiarrhythmics, vasodilators, anti-anginal, antihypertensive, vasoprotectors, fertility promoters, inducers and inhibitors of uterine labor, contraceptives, antibiotics, antifungals, antivirals, anti-cancer, anti-inflammatory, analgesic, anti-epileptics , anti-Parkinson, neuro- leptic, hypnotics, anxiolytics, psychostimulants, anti-migraine, antidepressants, cough suppressants, antihistamines or allergy.</li></ul>
Preferably, the one or PA is (are) selected (s) from the following compounds: prazosin, acyclovir, nifedipine, naproxen, ibuprofen, ketoprofen, fenoprofen, indomethacin, diclofenac, sulpiride, terfenadine, carbamazepine, fluoxetine, alprazolam, famotidine, ganciclovir, spironolactone, acetylsalicylic acid, quinidine, morphine, amoxicillin, paracetamol, metoclopramide, verapamil and mixtures thereof.
Regarding the preparation of microcapsules according to the invention, it refers to microencapsulation techniques available to the skilled person, the main ones are summarized in the article <nplcit id="ncit0001" npl-type="s"><text>C. DUVERNEY and JP BENOIT in "The chemical news", December 1986</text></nplcit>. Specifically, the technique in question is microencapsulation by film coating, leading to systems individualized "reservoir" as opposed to matrix systems. For further details, reference is made to the patent <patcit id="pcit0009" dnum="EP0953359B"><text>EP-B-0953359</text></patcit>.
PA particles of desired particle size necessary to achieve the microcapsules according to the invention may be pure PA crystals and / or have undergone a pretreatment by one of the conventional techniques of the art, such as granulation, in presence of at least one conventional binder and / or an agent for modifying the intrinsic solubility characteristics of the PA.
The present invention also provides a drug comprising the microcapsules as defined above.
This drug can be in solid form: tablet, capsule, powder, etc. or in liquid form, for example aqueous suspension.
According to the invention, it is also proposed as a solution to the problems mentioned at the beginning of this paper, namely: Modified-release, extended preferably PA poorly soluble in a dosage form easily swallowable, all in perspective therapeutic long, efficient and safe cover, using a plurality of microcapsules:<ul><li>each consist of a core comprising at least one active principle and of a coating film applied onto the core and controlling the prolonged release of the (or) PA,</li><li>whose average diameter is less than 1000 microns, preferably between 800 and 50 microns and more preferably still between 600 and 100 microns,</li><li>in which the coating film of each microcapsule contains the following components:<ul><li>→ -I-- at least one film-forming polymer (P1) insoluble in the fluids of the gastrointestinal tract;</li><li>→ -II-- at least one water-soluble polymer (P2); </li><li>→ -III- at least one plasticizer (PL);</li><li>→ -IV- and optionally at least one surfactant (SA) lubricant;</li></ul></li></ul>characterized in that:<ul><li>➢ the coating film of the microcapsules is at least 3% w / dry w, preferably at least 5% w / w dry of the total mass,</li><li>➢ and their core contains at least one AP and at least one solubilizing agent having the particularity, as soon as it is placed in aqueous solution at a concentration of 20% w / w at 37 ° C. an increase of more than 50% the solubility of the AP</li><li>➢ the (or) agent (s) solubilizing (s) present (s) in the core with the AP confer (s) in the heart in which (s) is (are) included such properties as the core behavior bare (uncoated) in a given dissolving test TD defined in the below examples, is as follows: release of 80% of the AP in less than two hours, preferably in less than one hour.</li></ul>for manufacturing a medicament based on at least one AP with low solubility and can be administered orally, swallowable and easily which is released in vivo in a controlled, sustained, and possibly delayed.
According to yet another of its objects, the present invention relates to a method of therapeutic treatment, wherein use is made of a medicament as defined above as product <i>per se</i> or as a product obtained by the above-described method
The invention will be better understood in terms of its composition and properties of its obtaining, reading the examples below, given by way of illustration and to bring out the embodiments and benefits of 'invention.
DESCRIPTION OF FIGURES:
<ul><li><b>Figure 1</b> shows the curve of the percentage of dissolved AP (% D) as a function of time (t) in hours (H), microcapsules of Example 1, the dissolution test TD.</li><li><b>Figure 2</b> shows the curve of the percentage of dissolved AP (% D) as a function of time (t) in hours (H), microcapsules of Example 2, the dissolution test TD.</li><li><b>Figure 3</b> shows the curve of the percentage of dissolved AP (% D) as a function of time (t) in hours (H), microcapsules of Example 3, the dissolution test TD.</li></ul>
<u>example 1</u>
1.1 - Preparation of Spironolactone Microcapsules:
Step 1: Granules
180 g of spironolactone, 100 g of polyoxyethylene hydrogenated castor oil (40 ethylene oxide units), marketed under the trademark Cremophor RH 40 and 120 g of povidone (Plasdone K29 / 32) are solubilized beforehand in a water / acetone / isopropanol (5/57/38 w / w). This solution is then sprayed on 800 g of cellulose spheres Celphere® CP - 305 (ASAHI KASEI; diameter between 300 and 500 microns) in an apparatus in a fluidized air bed Glatt® GPC-G1.
Step 2: Coating
50 g of granules obtained above are coated with 1.60 g of ethylcellulose (Ethocel Premium 7), 0.16 g of dibutyl sebacate, 0.64 g of polyoxyethylene hydrogenated castor oil (40 ethylene oxide units ) marketed under the trademark Cremophor RH 40 and 0.80 g of povidone (Plasdone K29 / 32) dissolved in an acetone / isopropanol mixture (60/40 w / w), in a fluidized air bed apparatus MiniGlatt .
1-2 - Composition of microcapsules:
<tables id="tabl0001" num="0001"><table frame="all"><title><u>Table 1</u></title><tgroup cols="3"><colspec colnum="1" colname="col1" colwidth="43mm" /><colspec colnum="2" colname="col2" colwidth="24mm" /><colspec colnum="3" colname="col3" colwidth="48mm" /><thead><row><entry align="center" valign="top"><b>ingredients</b></entry><entry align="center" valign="top"><b>% by mass</b></entry><entry align="center" valign="top"><b>manufacturing of Formula (g)</b></entry></row></thead><tbody><row><entry><b>Spironolactone pellets</b></entry><entry align="center"><b>94.00</b></entry><entry align="center" /></row><row><entry>- Cellulose Spheres</entry><entry align="center">(62.7)</entry><entry align="center" /></row><row><entry>- Plasdone K29 / 32</entry><entry align="center">(9.4)</entry><entry align="center">50</entry></row><row><entry>- Cremophor RH 40</entry><entry align="center">(7,8)</entry><entry align="center" /></row><row><entry>- Spironolactone</entry><entry align="center">(14.1)</entry><entry align="center" /></row><row><entry><b>Coating</b></entry><entry align="center"><b>6.00</b></entry><entry align="center" /></row><row><entry>- Ethocel® 7 Premium</entry><entry align="center">(3.0)</entry><entry align="center" /></row><row><entry>- Plasdone K29 / 32</entry><entry align="center">(1.5)</entry><entry align="center">3.2</entry></row><row><entry>- Cremophor RH 40</entry><entry align="center">(1,2)</entry><entry align="center" /></row><row><entry>- Dibutyl sebacate</entry><entry align="center">(0.3)</entry><entry align="center" /></row></tbody></tgroup></table></tables>
1.3 -increasing solubility
In an aqueous solution at pH 6.8 and containing 20% by weight of Cremophor® RH 40, the solubility at 25 ° C of spironolactone, which without solubilizing agent is of the order of 38 mg / l, is multiplied by a factor 5.
1.4 - Dissolution Test (TD)
:
The release kinetics of spironolactone is determined by a dissolution test (type II device according to the European Pharmacopoeia 3rd edition, medium phosphate buffer pH 6.8, 1000 ml volume, temperature 37 ° C, stirring blades 100 rev / min, UV detection 240 nm).
TD test is first carried out on non-coated granules, and then on microcapsules comprising these granules.
TD test result:
<ul><li>Granules uncoated: release is complete (greater than 97% dissolution) at t = 1 hour.</li><li>Microcapsules: The result is shown in FIG.1 attached.</li></ul>
The microcapsule composition described above allows to obtain a modified-release profile over 8 h spironolactone very low solubility (0.02 g / l). The membrane 6% of the weight of the microcapsule, which ensures a reproducible release profile in an industrial process.
<u>example 2</u>
2.1 - Preparation of Spironolactone Microcapsules:
Step 1: Granules
180 g of spironolactone, 100 g of polyoxyethylene hydrogenated castor oil (40 ethylene oxide units), marketed under the trademark Cremophor RH 40 and 120 g of povidone (Plasdone K29 / 32) are solubilized beforehand in a water / acetone / isopropanol (5/57/38 w / w). This solution is then sprayed on 800 g of cellulose spheres (diameter between 300 and 500 microns) in an apparatus in a fluidized air bed Glatt® GPC-G1.
Step 2: Coating
50 g of granules obtained above are coated with 1.44 g of ethylcellulose (Ethocel Premium 7), 0.16 g of castor oil, 0.64 g of polyoxyethylene-polyoxypropylene copolymers (Lutrol® F-68) and 0.96 g of povidone (Plasdone K29 / 32) dissolved in an acetone / isopropanol mixture (60/40 w / w), in an apparatus in a fluidized air bed miniGlatt®.
2.2 - Composition of microcapsules:
<tables id="tabl0002" num="0002"><table frame="all"><title><u>Table 2</u></title><tgroup cols="3"><colspec colnum="1" colname="col1" colwidth="43mm" /><colspec colnum="2" colname="col2" colwidth="24mm" /><colspec colnum="3" colname="col3" colwidth="48mm" /><thead><row><entry align="center" valign="top"><b>ingredients</b></entry><entry align="center" valign="top"><b>% by mass</b></entry><entry align="center" valign="top"><b>manufacturing of Formula (g)</b></entry></row></thead><tbody><row><entry><b>Spironolactone pellets</b></entry><entry align="center"><b>94.00</b></entry><entry align="center" /></row><row><entry>- Cellulose Spheres</entry><entry align="center">(62.7)</entry><entry align="center" /></row><row><entry>- Plasdone @ K29 / 32</entry><entry align="center">(9.4)</entry><entry align="center">50</entry></row><row><entry>- Cremophor RH 40</entry><entry align="center">(7,8)</entry><entry align="center" /></row><row><entry>- Spironolactone</entry><entry align="center">(14.1)</entry><entry align="center" /></row><row><entry><b>Coating</b></entry><entry align="center"><b>6.00</b></entry><entry align="center" /></row><row><entry>- Ethocel 7 Premium</entry><entry align="center">(2.7)</entry><entry align="center" /></row><row><entry>- Plasdone K29 / 32</entry><entry align="center">(1,8)</entry><entry morerows="1" align="center">3.2</entry></row><row><entry>- Lutrol F-68</entry><entry align="center">(1,2)</entry></row><row><entry>- Castor oil</entry><entry align="center">(0.3)</entry><entry align="center" /></row></tbody></tgroup></table></tables>
2.3 - TD Test:
The release kinetics of spironolactone is determined by a dissolution test (type II device according to the European Pharmacopoeia 3rd edition, medium phosphate buffer pH 6.8, 1000 ml volume, temperature 37 ° C, stirring blades 100 rev / min, UV detection 240 nm).
TD test result:
The result is shown in Fig.2 attached
The microcapsule composition described above allows to obtain a modified-release profile over 8 h spironolactone very low solubility (0.02 g / l). The membrane 6% of the weight of the microcapsule, which ensures a reproducible release profile in an industrial process.
<u>example 3</u>
3.1 Preparation of Spironolactone Microcapsules:
Step 1: Granules
35 g of spironolactone, 2.5 g of polyoxyethylene hydrogenated castor oil (40 ethylene oxide units), marketed under the trademark Cremophor RH 40 12.5 g of povidone (Plasdone K29 / 32) and 200 g of lactose are premixed dry in a laboratory granulator (Mi-PRO / Pro-C-ept) for 5 minutes. This powder mixture is then granulated with water (20 g). The granules are dried at 40 ° C. in a ventilated oven and then graded on a 500 microns. is selected by sieving the fraction 200-500 microns.
Step 2: Coating
50 g of granules obtained above are coated with 1.88 g of ethylcellulose (Ethocel Premium 7), 0.23 g of castor oil, 0.75 g of polyoxyethylene hydrogenated castor oil (40 oxide units ethylene), sold under the trademark Cremophor RH 40 and 0.90 g of povidone (Plasdone K29 / 32) dissolved in an acetone / isopropanol mixture (60/40 w / w), in an apparatus in a fluidized bed MiniGlatt.
3.2 - Composition of microcapsules:
<tables id="tabl0003" num="0003"><table frame="all"><title><u>Table 3</u></title><tgroup cols="3"><colspec colnum="1" colname="col1" colwidth="43mm" /><colspec colnum="2" colname="col2" colwidth="24mm" /><colspec colnum="3" colname="col3" colwidth="48mm" /><thead><row><entry align="center" valign="top"><b>ingredients</b></entry><entry align="center" valign="top"><b>% by mass</b></entry><entry align="center" valign="top"><b>manufacturing of Formula (g)</b></entry></row></thead><tbody><row><entry><b>Spironolactone pellets</b></entry><entry align="center"><b>93.00</b></entry><entry align="center" /></row><row><entry>- Lactose</entry><entry align="center">(74,40)</entry><entry align="center" /></row><row><entry>- Plasdone®K29 / 32</entry><entry align="center">(4.65)</entry><entry align="center">50</entry></row><row><entry>- Cremophor RH 40</entry><entry align="center">(0.93)</entry><entry align="center" /></row><row><entry>- Spironolactone</entry><entry align="center">(13,02)</entry><entry align="center" /></row><row><entry><b>Coating</b></entry><entry align="center"><b>7.00</b></entry><entry align="center" /></row><row><entry>- Premium Ethocel®7</entry><entry align="center">(3.50)</entry><entry align="center" /></row><row><entry>- Plasdone K29 / 32</entry><entry align="center">(1.68)</entry><entry align="center" /></row><row><entry>- Cremophor RH 40</entry><entry align="center">(1.40)</entry><entry align="center">3.76</entry></row><row><entry>- Castor oil</entry><entry align="center">(0.42)</entry><entry align="center" /></row></tbody></tgroup></table></tables>
3.3 -Test:
The release kinetics of spironolactone is determined by a dissolution test (type II device according to the European Pharmacopoeia 3rd edition, medium phosphate buffer pH 6.8, 1000 ml volume, temperature 37 ° C, stirring blades 100 rev / min, UV detection 240 nm).
TD test result:
The result is shown in the <b>FIG.3</b> attached
The microcapsule composition described above allows to obtain a modified-release profile over 12 hours, spironolactone very low solubility (0.02 g / l). The membrane represents 7% by weight of the microcapsule, which ensures a reproducible release profile in an industrial process.
<u>example 4</u>
The capacity of the solubilizing agent consisting of Cremophor RH 40 to solubilize an active principle consisting of spironolactone, is tested according to the measurement method from the following solubility: The AP is introduced into an aqueous solution containing solubilizing agent. The solution was stirred at 37 ° C for 6 hours then filtered through a filter of 0.2 .mu.m pore diameter. The content of solubilized AP is evaluated by HPLC. The results are given in Table 4 below.<tables id="tabl0004" num="0004"><table frame="all"><title><u>Table 4</u></title><tgroup cols="2"><colspec colnum="1" colname="col1" colwidth="53mm" /><colspec colnum="2" colname="col2" colwidth="71mm" /><thead><row><entry align="center" valign="top"><b>Cremophor® RH 40% w / w at 37 ° C</b></entry><entry align="center" valign="top"><b>(Spironolactone) dissolved in solution mg / ml</b></entry></row></thead><tbody><row><entry align="center">0</entry><entry align="center"><0.1</entry></row><row><entry align="center">1</entry><entry align="center">0.1</entry></row><row><entry align="center">2</entry><entry align="center">0.2</entry></row><row><entry align="center">5</entry><entry align="center">0.4</entry></row><row><entry align="center">10</entry><entry align="center">0.8</entry></row><row><entry align="center">20</entry><entry align="center">1.4</entry></row></tbody></tgroup></table></tables>
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Numbers
- Publication
- 1524968
- Publication, DOCDB
- 1524968
- Publication, EPODOC
- EP1524968
- Application
- 3750852
- Application, DOCDB
- 03750852
- Application, EPODOC
- EP20030750852
Titles3
- German
- ORAL ANZUWENDENDES ARZNEIMITTEL BESTEHEND AUS EINER VIELZAHL VON MIKROKAPSELN FÜR DIE VERZÖGERTE VERABREICHUNG VON WIRKSTOFFEN
- English
- ORAL PHARMACEUTICAL FORMULATION IN THE FORM OF A PLURALITY OF MICROCAPSULES FOR PROLONGED RELEASE OF ACTIVE PRINCIPLE(S) WITH LOW SOLUBILITY
- French
- FORMULATION PHARMACEUTIQUE ORALE SOUS FORME D'UNE PLURALITE DE MICROCAPSULES PERMETTANT LA LIBERATION PROLONGEE DE PRINCIPE(S) ACTIF(S) PEU SOLUBLE(S)
Classification
- CPC, 5
- A61K9/5047
- A61K9/50
- A61K9/5015
- A61K9/5026
- A61K9/5078
- IPC, 1
- A61K9 50
Designated states27
- Contracting states, 27
- Austria
- Belgium
- Bulgaria
- Switzerland
- Cyprus
- Czechia
- Germany
- Denmark
- Estonia
- Spain
- Finland
- France
- United Kingdom
- Greece
- Hungary
- Ireland
- Italy
- Liechtenstein
- Luxembourg
- Monaco
- Netherlands (Kingdom of the)
- Portugal
- Romania
- Sweden
and 3 moreShow fewer
- Slovenia
- Slovakia
- Türkiye