A concentrated solution of quaternary ammonium compounds and methods of use

The claims a thick quaternary ammonium compound solution, comprising a QAC, wherein concentration is greater than about 10 weights %, at least a solubilizer, a mellowness. QAC solution of dilution of a contact food for preventing on the food microorganism to grow, preventing wide spectrum food source microbial contamination. Claims a food with diluting method of QAC contact are, and is at least 0.1 second. A from the food for processing method of the meat and meat product, sea product, vegetables, fruit, milk product, the pet food and fast-food, and one other can be processed and still maintains wherein said appearance and socking opening structure food. A for processing method spraying QAC solution and spraying on the food, wherein the alleviation and capable of preventing pollution of wide spectrum food source microorganism is at least 0.1 second.