芦荟合成的 Ag 纳米粒子负载在 PVA/ 壳聚糖上,可作为生物降解和抗菌薄膜用于食品储存

IF 1.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Nhung Thi Tran
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引用次数: 0

摘要

我们在聚乙烯醇(PVA)和壳聚糖基质中加入了绿色合成的银纳米粒子(AgNPs),开发出了一种新型、环保、活性食品包装膜。以芦荟提取物为还原剂,壳聚糖为稳定剂,在高温下原位高产绿色合成了银纳米粒子。通过控制生长液中 AgNO3 前驱体的含量,获得的 AgNPs 呈准球形,尺寸可在 20 ∼ 30 nm 范围内调节。原位合成使 AgNPs 在薄膜中均匀分布,无需提纯。研究了芦荟合成的 AgNPs 的负载量对薄膜特性的影响。结果表明,所获得的负载 AgNPs 的薄膜具有优异的机械性能(拉伸强度为 36.7 兆帕,断裂伸长率为 213.9%),对大肠杆菌具有出色的杀菌和抑菌效果。此外,在聚合物薄膜中加入绿色合成的 AgNPs 还能显著改善薄膜表面与甘油液滴之间形成的接触角,增强热稳定性,降低水膨胀和水溶性。所有这些结果都凸显了这些可生物降解的抗菌膜作为石油基塑料的替代品在食品包装和保存方面的巨大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Aloe vera-synthesized Ag nanoparticles loaded on PVA/chitosan as biodegradable and antibacterial film for food storage
We have developed a novel, eco-friendly, and active food packaging film by incorporating green-synthesized silver nanoparticles (AgNPs) into polyvinyl alcohol (PVA) and chitosan matrices. The AgNPs were in situ and green synthesized in high-yield by using Aloe vera extract as a reducing agent and chitosan as a stabilizing agent at high temperature. The obtained AgNPs exhibit quasi-spherical shapes and tunable size in the range 20 ∼ 30 nm by controlling the content of AgNO3 precursor in the growth solution. The in situ synthesis enables the homogeneous distribution of AgNPs throughout the films and eliminates the need for purification. The effect of the loaded amounts of Aloe vera-synthesized AgNPs on the film characteristics was investigated. The results show that the obtained AgNPs-loaded films exhibit excellent mechanical properties (tensile strength of 36.7 MPa and elongation at break of 213.9%) and superior bacterial killing and inhibition effects against E. coli. Moreover, the incorporation of green-synthesized AgNPs into the polymeric films also results in a significant improvement in the contact angles formed between the film surface and glycerol droplets, enhanced thermal stability, and a reduction in water swelling and water solubility. All these results highlight the great potential of these biodegradable and antibacterial membranes as an alternative to petroleum-based plastics in food packaging and preservation.
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来源期刊
Materials Research Express
Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
4.50
自引率
4.30%
发文量
640
审稿时长
12 weeks
期刊介绍: A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.
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