Development of silver/titanium dioxide/chitosan adipate nanocomposite as an antibacterial coating for fruit storage
Development of silver/titanium dioxide/chitosan adipate nanocomposite as an antibacterial coating for fruit storage
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DOI：
10.1016/j.lwt.2015.04.049
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发表时间：
2015-10-01
影响因子：
6
通讯作者：
Wang, Qin
中科院分区：
文献类型：
--
作者：
Lin, Baofeng;Luo, Yaguang;Wang, Qin
使用壳聚糖己二酸酯模板通过光化学还原开发了银/二氧化钛/壳聚糖己二酸酯（Ag/TiO2/CS）的新型纳米复合材料。壳聚糖作为还原剂通过Ag-N配位键和静电吸引力锚定金属离子，从而稳定了傅里叶变换红外光谱和X射线衍射图样观察到的Ag/TiO2/CS产物。扫描电子显微镜观察表明，纳米复合颗粒（50-100 nm）沉积在壳聚糖己二酸酯层上。该产品在 60 天的储存过程中表现出 30.1 mV 至 33.0 mV 的高 zeta 电位。此外，在相似浓度下，纳米复合材料表现出比 AgNO3 或纳米银颗粒更高的抗菌活性，如抑菌圈、最低抑菌浓度 (MIC) 和生长曲线所证明的那样。孵育 24 小时后，纳米复合材料将大肠杆菌数量减少了 6 个对数，MIC 值为 038 ug Ag/mL。这些结果表明Ag/TiO2/CS 有潜力用作水果储存的抗菌保护涂层。 (C) 2015 Elsevier Ltd. 保留所有权利。
A novel nanocomposite of silver/titanium dioxide/chitosan adipate (Ag/TiO2/CS) was developed through photochemical reduction using a chitosan adipate template. Chitosan served as a reducing agent anchoring the metal ions through Ag-N coordination bonds and electrostatic attractions, thus stabilizing the Ag/TiO2/CS product observed by Fourier transform infrared spectroscopy and X-ray diffraction patterns. Scanning electron microscopy observations revealed that the nanocomposite particles (50-100 nm) were deposited onto the chitosan adipate layer. The product exhibited high zeta-potentials from 30.1 mV to 33.0 mV during 60 days of storage. In addition, the nanocomposite demonstrated higher antimicrobial activity than AgNO3 or nano-Ag particles at similar concentrations, as evidenced by the inhibition zone, minimum inhibitory concentrations (MIC), and growth curve. The nanocomposite reduced the Escherichia coli population by 6 logs after 24 h of incubation, and had an MIC value of 038 ug Ag/mL. These results suggest that Ag/TiO2/CS has the potential to be used as an antibacterial protective coating for fruit storage. (C) 2015 Elsevier Ltd. All rights reserved.