利用 ZnO-壳聚糖纳米粒子改善淀粉基抗菌复合薄膜的性能。
Improving the properties of starch-based antimicrobial composite films using ZnO-chitosan nanoparticles.
机构信息
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, PR China.
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
出版信息
Carbohydr Polym. 2019 Apr 15;210:204-209. doi: 10.1016/j.carbpol.2019.01.043. Epub 2019 Jan 14.
This work dealt with the antimicrobial nanoparticles and incorporated them into the modified starch matrix to prepare composite films. The ZnO-chitosan nanoparticles with 57.3 wt% ZnO were sol-gel synthesized for formation of hexagonal phase. The absorption peak and average size of nanoparticles was approximately 364 nm and 25 nm, respectively. It was observed that nanoparticles with less than 3.0 wt% were homogenously dispersed in the starch matrix. The increase of nanoparticles in films resulted in a substantial reduction of water vapor permeability from 51.0% to 43.7% accompanied with an increase of tensile strength from 4.11 to 12.79 MPa (p < 0.05). Moreover, higher addition (4.0-5.0 wt%) resulted in aggregation of nanoparticles in films and increased water vapor permeability (p < 0.05). The antimicrobial activity of starch-based films was positively correlated with the loading level of nanoparticles, and these films had stronger suppression in Gram-positive S. aureus than Gram-negative E. coli.
这项工作涉及抗菌纳米粒子，并将其掺入改性淀粉基质中以制备复合膜。ZnO-壳聚糖纳米粒子以 57.3wt%的 ZnO 通过溶胶-凝胶法合成，形成六方相。纳米粒子的吸收峰和平均粒径分别约为 364nm 和 25nm。结果表明，小于 3.0wt%的纳米粒子在淀粉基质中均匀分散。随着薄膜中纳米粒子含量的增加，水蒸气透过率从 51.0%显著降低至 43.7%，拉伸强度从 4.11MPa 增加至 12.79MPa（p<0.05）。此外，较高的添加量（4.0-5.0wt%）会导致纳米粒子在薄膜中聚集，从而增加水蒸气透过率（p<0.05）。基于淀粉的薄膜的抗菌活性与纳米粒子的负载水平呈正相关，并且这些薄膜对革兰氏阳性的金黄色葡萄球菌的抑制作用强于革兰氏阴性的大肠杆菌。
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