目的 对淀粉接枝抑菌肽，得到抑菌淀粉，并挤出成膜，表征其性质，为淀粉的应用提供参考。方法 借助偶联剂，将ε-聚赖氨酸盐酸盐(ε-polylysine-HCl，ε-PLH)接枝到玉米淀粉上，分析其化学结构、微观结构、热性能及抑菌性。通过熔融挤出法将接枝淀粉与聚乳酸(Polylactic acid，PLA)、聚己二酸/对苯二甲酸丁二酯(Poly butyleneadipate-co-terephthalate，PBAT)共混改性成膜，表征其力学性能、抑菌性能。结果 FTIR显示，ε-PLH被成功接枝到淀粉分子上;热重分析(TGA)结果显示，接枝淀粉的起始分解温度有所下降;含有30%接枝淀粉的PBAT/PLA薄膜具有更高的拉伸强度。此外，接枝淀粉添加量为30%的薄膜对大肠杆菌、金黄色葡萄球菌的抑制率分别达到了46.53%、68.81%。结论 接枝ε-聚赖氨酸盐酸盐是一种有效的淀粉改性途径，接枝淀粉/PBAT/PLA薄膜具有良好的应用前景。

The work aims to graft ε-polylysine-HCl (ε-PLH) onto corn starch so as to prepare antimicrobial starch, and prepare films based the grafted starch and characterize the properties of both grafted starch and films to provide reference for application of starch. Coupling agent was utilized to graft starch and ε-PLH and the chemical structure, micromorphology, thermal stability and antimicrobial properties of grafted starch were determined. Films were prepared by the modified starch, polylactic acid (PLA) and poly (butylene adipate co-terephthalate) (PBAT) through melt extrusion process. The mechanical and antimicrobial properties of films were determined. FTIR results showed that ε-PLH was grafted onto starch successfully, and thermogravimetric analysis (TGA) showed decrease in the initial decomposition temperature of grafted starch. The films with 30% grafted starch presented better tensile strength. Moreover, the films with 30% grafted starch showed 46.53% and 68.81% inhibitory rate against E.coli and S.aureus respectively. In conclusion, grafting ε-PLH is an approach that effectively modifies starch and the grafted starch/PBAT/PLA films have great practical potential.