ε-polylysine is a light yellow powder with strong hygroscopicity and slightly bitter taste. It is a linear polymer of lysine. It is produced by Streptomyces fermentation and has a broad-spectrum antibacterial effect. ε-polylysine is polymerized from 25-30 lysine groups in Chemicalbook. It is relatively stable to ph and heat. Its antibacterial effect is related to the degree of polymerization and the environment. The antibacterial activity is between 3600-4300 molecular weight. most.