Zhou Shengxue, Zhai Xiaosong, Zhang Rui, Wang Wentao, Lim Loong-Tak, Hou Hanxue
College of Food Science and Engineering, Shandong Agricultural University, Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an 271018, China.
Department of Food Science, University of Guelph, Guelph, ON N1G 2W1, Canada.
Nanomaterials (Basel). 2021 Nov 14;11(11):3062. doi: 10.3390/nano11113062.
In this current work, antimicrobial films based on starch, poly(butylene adipate--terephthalate) (PBAT), and a commercially available AgNPs@SiO antibacterial composite particle product were produced by using a melt blending and blowing technique. The effects of AgNPs@SiO at various loadings (0, 1, 2, 3, and 4 wt%) on the physicochemical properties and antibacterial activities of starch/PBAT composite films were investigated. AgNPs@SiO particles were more compatible with starch than PBAT, resulting in preferential distribution of AgNPs@SiO in the starch phase. Infusion of starch/PBAT composite films with AgNPs@SiO marginally improved mechanical and water vapor barrier properties, while surface hydrophobicity increased as compared with films without AgNPs@SiO. The composite films displayed superior antibacterial activities against both Gram-positive () and Gram-negative () bacteria. The sample loaded with 1 wt% AgNPs@SiO (SPA-1) showed nearly 90% inhibition efficiency on the tested microorganisms. Furthermore, a preliminary study on peach and nectarine at 53% RH and 24 °C revealed that SPA-1 film inhibited microbial spoilage and extended the product shelf life as compared with SPA-0 and commercial LDPE packaging materials. The high-throughput production method and strong antibacterial activities of the starch/PBAT/AgNPs@SiO composite films make them promising as antimicrobial packaging materials for commercial application.
在当前这项工作中，通过熔融共混和吹塑技术制备了基于淀粉、聚（己二酸丁二醇酯 - 对苯二甲酸丁二醇酯）（PBAT）以及市售的AgNPs@SiO抗菌复合颗粒产品的抗菌薄膜。研究了不同负载量（0、1、2、3和4 wt%）的AgNPs@SiO对淀粉/PBAT复合薄膜的物理化学性质和抗菌活性的影响。AgNPs@SiO颗粒与淀粉的相容性比与PBAT的相容性更好，导致AgNPs@SiO优先分布在淀粉相中。向淀粉/PBAT复合薄膜中添加AgNPs@SiO略微改善了其机械性能和水汽阻隔性能，同时与不含AgNPs@SiO的薄膜相比，表面疏水性有所增加。复合薄膜对革兰氏阳性菌（）和革兰氏阴性菌（）均表现出优异的抗菌活性。负载1 wt% AgNPs@SiO的样品（SPA - 1）对测试微生物显示出近90%的抑制效率。此外，在53%相对湿度和24°C条件下对桃子和油桃进行的初步研究表明，与SPA - 0和商用低密度聚乙烯包装材料相比，SPA - 1薄膜抑制了微生物腐败并延长了产品保质期。淀粉/PBAT/AgNPs@SiO复合薄膜的高通量生产方法和强大的抗菌活性使其有望成为商业应用的抗菌包装材料。
