**2.1.6 Systematic applications of polypeptide separation engineering**

Polypeptide separation technologies mentioned above are combined to use in practice. Different separation tools will be used according to the nature of polypeptide. In particular in the post genome era, researches on the proteome are deepened and people are making continuous progress in tools for separating polypeptides and proteins. They have comprehensively utilized natures of proteins and polypeptides and adopted both the routine protein and polypeptide extraction methods aforementioned and also the high efficiency liquid chromatography, capillary electrophoresis and 2-d electrophoresis, to get as many polypeptides as possible.
