Abstract Corn starch/polyvinyl alcohol (PVA)/glycerol composite films incorporated with ε-polylysine were prepared, and their properties were investigated. The Fourier-transform infrared (FTIR) spectroscopy indicated that the interactions happened between the amino group of ε-polylysine and hydroxyl group starch/PVA composite films. X-ray diffraction (XRD) analysis showed that the addition of ε-polylysine decreased the intensity of all crystal peaks. Thermogravimetric (TGA) analysis suggested that ε-polylysine improved the thermal stability of composite films. Scanning electron microscopic (SEM) analysis showed that the upper surface of composite films incorporated with ε-polylysine presented more compact and flat surface. The antimicrobial activity of the composite film progressively increased with the increasing of ε-polylysine concentration (P < 0.05). The tensile strength, elongation at break and water absorption significantly increased, whereas water solubility decreased with the increasing of ε-polylysine concentration (P < 0.05). Therefore, the corn starch/PVA/glycerol composite films incorporated with ε-polylysine had good mechanical, physical and antimicrobial properties and could have potential application as a novel antimicrobial packaging material.

中文翻译：

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含有ε-聚赖氨酸的玉米淀粉/PVA/甘油复合薄膜作为新型抗菌包装材料的制备与表征

摘要 制备了掺入ε-聚赖氨酸的玉米淀粉/聚乙烯醇(PVA)/甘油复合薄膜，并对其性能进行了研究。傅里叶变换红外 (FTIR) 光谱表明，ε-聚赖氨酸的氨基与羟基淀粉/PVA 复合膜之间发生了相互作用。X 射线衍射 (XRD) 分析表明，ε-聚赖氨酸的加入降低了所有晶体峰的强度。热重 (TGA) 分析表明 ε-聚赖氨酸提高了复合薄膜的热稳定性。扫描电子显微镜 (SEM) 分析表明，掺入 ε-聚赖氨酸的复合膜的上表面呈现出更紧凑和平坦的表面。随着ε-聚赖氨酸浓度的增加，复合膜的抗菌活性逐渐增强（P < 0.05）。拉伸强度、断裂伸长率和吸水率显着增加，而水溶性随着ε-聚赖氨酸浓度的增加而降低（P < 0.05）。因此，掺入ε-聚赖氨酸的玉米淀粉/PVA/甘油复合薄膜具有良好的机械、物理和抗菌性能，具有作为新型抗菌包装材料的潜在应用价值。