ε-Polylysine, a kind of peptide with a linkage between a－carboxyl group and e－amino group, is a natural substance from microbial metabolism. It has lots of advantages over traditional preservatives, such as high safety good heat tolerance and solubility in water and extensive antimicrobial against Gram+, Gram-bacteria and fungi. Now it has been applied extensively in
food and pharmaceutical industry for the wide range of antimicrobial spectrum.
