He Beibei, Wang Yifei, Jiang Zixuan, Liu Shucheng, Zhu Jie
Laboratory of Muscle and Meat Biophysics, Institute of Biophysics and College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China; Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China.
Laboratory of Muscle and Meat Biophysics, Institute of Biophysics and College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China.
Int J Biol Macromol. 2021 Nov 30;191:1126-1136. doi: 10.1016/j.ijbiomac.2021.09.181. Epub 2021 Oct 2.
Antibacterial composite films were produced from carboxymethyl cellulose-gelatin (CMC-Gel) blend with different concentration of ε-polylysine (ε-PL) and their physical and chemical properties were characterized. Compared with the control CMC-Gel film, the functionalized films had almost indistinguishable crystalline type, thickness, tensile strength, and elongation at break, however, poor water vapor barrier properties. The results showed that the ε-PL was well incorporated into CMC-Gel matrix by electrostatic interaction, as the changes of absorption peaks in the Fourier transform infrared spectrometer and the increase of glass transition temperature in differential scanning calorimeter. The films containing ε-PL showed excellent antibacterial activity against S. aureus, B. subtilis, E. coli and P. aeruginosa. In the composting experiment, the films become degraded on the seventh day, and further degraded with the growth of molds over time. The present results showed that the active films could be a potential material for food packaging.
通过将不同浓度的ε-聚赖氨酸（ε-PL）与羧甲基纤维素-明胶（CMC-Gel）共混制备了抗菌复合膜，并对其物理和化学性质进行了表征。与对照CMC-Gel膜相比，功能化膜的晶型、厚度、拉伸强度和断裂伸长率几乎没有区别，然而，其水蒸气阻隔性能较差。结果表明，通过傅里叶变换红外光谱仪中吸收峰的变化以及差示扫描量热仪中玻璃化转变温度的升高，ε-PL通过静电相互作用很好地掺入到CMC-Gel基质中。含ε-PL的膜对金黄色葡萄球菌、枯草芽孢杆菌、大肠杆菌和铜绿假单胞菌表现出优异的抗菌活性。在堆肥实验中，膜在第7天开始降解，并随着霉菌的生长随时间进一步降解。目前的结果表明，活性膜可能是一种潜在的食品包装材料。
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