... efficient, safe, and has no side-effects. Poly-L-lysine (ε-poly-L-lysine, EPL) is a small natural homopolymer of ... the essential amino acid L-lysine that is produced by bacterial fermentation. ε-Poly-L-lysine is used as a ... acetate, ether, ect.. Its activity is not affected by PH, and stable when heated (120°C for 20min). Therefore, ... regards,Nicole HuangHenan Kingway Chemicals Co., Ltd. Poly-L-lysine