Rapid and quantitative proteome analysis and related methods

The present invention offers the method of identifying polypeptide by determining simultaneously the mass of the subset of the parent polypeptide of the group origin of polypeptide, and the mass of the fragmentation of the subset of parent polypeptide, The following processes; the process of identifying one or more polypeptides of the polypeptide index which has the process; of measuring the mass determined as the polypeptide index on which it expounded, and the determined mass and on which it expounded is included. The present invention offers again the method of identifying polypeptide, by determining two or more features relevant to polypeptide or its fragmentation.