School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, 310018, China.
School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, 310018, China.
Carbohydr Polym. 2020 May 15;236:116078. doi: 10.1016/j.carbpol.2020.116078. Epub 2020 Feb 27.
A novel nanocomposite film was fabricated by carboxymethyl chitosan (CMCS) and nano MgO for potential food packaging applications. The impregnation of MgO nanoparticles into CMCS was evidenced by the X-ray diffraction and FTIR spectroscopy. SEM micrographs revealed a dense layer of MgO formation in the CMCS matrix, which is a major contributor to the improvement of crystallinity. Compared with pure CMCS, CMCS/MgO composites confer improved thermal stability, better UV shielding performance, as well as water-insolubility, improving the feasibility of using CMCS-based biopolymer films as food packagings, especially in the case of water-rich food. These physical properties were further enhanced with the increase in MgO content. Furthermore, MgO nanoparticles can simultaneously provide CMCS with increased elasticity and ductility at a rather low filler content (1.0 % by weight). For biological properties, CMCS/MgO composites exhibited excellent antimicrobial activity against Listeria monocytogenes and Shewanella baltica.
一种新型纳米复合膜由羧甲基壳聚糖（CMCS）和纳米氧化镁制备而成，具有潜在的食品包装应用前景。X 射线衍射和傅里叶变换红外光谱证实了 MgO 纳米粒子浸渍到 CMCS 中。扫描电子显微镜照片显示，CMCS 基质中形成了一层致密的氧化镁，这是提高结晶度的主要因素。与纯 CMCS 相比，CMCS/MgO 复合材料具有更好的热稳定性、更好的紫外屏蔽性能以及不溶于水的特性，提高了基于 CMCS 的生物聚合物薄膜作为食品包装的可行性，特别是在富含水的食品的情况下。随着 MgO 含量的增加，这些物理性能得到了进一步的提高。此外，MgO 纳米粒子在较低的填充量（重量的 1.0%）下，还可以同时为 CMCS 提供更高的弹性和延展性。在生物性能方面，CMCS/MgO 复合材料对单核细胞增生李斯特菌和希瓦氏菌表现出优异的抗菌活性。
