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|Section2= }} Polylysine refers to several types of lysine homopolymers, which may differ from each other in terms of stereochemistry and link position. ==Chemical structure and function== The precursor amino acid lysine contains two amino groups, one at the α-carbon and one at the ε-carbon. Either can be the location of polymerization, resulting in α-polylysine or ε-polylysine. Polylysine is a homopolypeptide belonging to the group of cationic polymers: at pH 7, polylysine contains a positively charged hydrophilic amino group. α-Polylysine is a synthetic polymer, which can be composed of either L-lysine or D-lysine. "L" and "D" refer to the chirality at lysine's central carbon. This results in poly-L-lysine (PLL) and poly-D-lysine (PDL) respectively.〔Sitterley, G. (2008). Poly-l-lysine cell attachment protocol. BioFiles, 3(8), 12.〕 ε-Polylysine (ε-poly-L-lysine, EPL) is typically produced as a homopolypeptide of approximately 25–30 L-lysine residues. According to research, ε-polylysine is adsorbed electrostatically to the cell surface of the bacteria, followed by a stripping of the outer membrane. This eventually leads to the abnormal distribution of the cytoplasm causing damage to the bacterial cell that is produced by bacterial fermentation. ε-Poly-L-lysine is used as a natural preservative in food products. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「polylysine」の詳細全文を読む スポンサード リンク
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