Preparation, characterisation and antibacterial properties of thermoplastic chitosan/nano ZnO composites
Preparation, characterisation and antibacterial properties of thermoplastic chitosan/nano ZnO composites
复制标题
热塑性壳聚糖/纳米ZnO复合材料的制备、表征及抗菌性能
DOI：
10.1080/10667857.2021.1990459
复制
发表时间：
2021-10
影响因子：
3.1
通讯作者：
Yu Zhang
中科院分区：
文献类型：
--
作者：
Yaoxin Zhang;Lixia Huang;Taoxing Dong;Bin Li;Yu Zhang
摘要本研究采用密炼机热机械处理法制备了热塑性壳聚糖/纳米氧化锌（CZ）复合材料。采用稀盐酸水溶液作为壳聚糖的破乳剂和纳米氧化锌的溶剂。傅立叶变换红外光谱和扫描电子显微镜证实了壳聚糖-ZnO相互作用。纳米ZnO的加入降低了复合材料的结晶度和紫外透过率，提高了复合材料的热稳定性。CZ复合材料的抗菌活性检查在其抑制和杀菌效果对大肠杆菌，金黄色葡萄球菌，枯草芽孢杆菌。与纯壳聚糖片相比，CZ复合材料的抗菌性能得到改善。革兰氏阳性菌（S. aureus和B.枯草杆菌（E. subtilis）对CZ复合物的抗菌活性比革兰氏阴性菌（E.大肠杆菌）。本工作提供了一种简单的制备壳聚糖基材料的方法，并获得了具有改善的抗菌活性的CZ复合材料，可应用于农业和食品安全。
ABSTRACT This study prepares thermoplastic chitosan/nano ZnO (CZ) composites by thermomechanical treatment in an internal mixer. Dilute hydrochloric acid aqueous solution is used as the destructuring agent of chitosan and solvent of nano ZnO. Fourier transform infrared spectroscopy and scanning electron microscopy confirm the chitosan–ZnO interaction. The crystallinity and UV transmittance of the composites decreases, while their thermal stability increases due to the addition of nano ZnO. The antibacterial activity of the CZ composites is examined in terms of their inhibitory and bactericidal effects against Escherichia coli, Staphylococcus aureus, and Bacillus subtilis. Improved antibacterial properties are obtained for the CZ composites, compared to pure chitosan sheet. Gram-positive bacteria (S. aureus and B. subtilis) are more sensitive to the antibacterial activity of the CZ composites than Gram-negative bacteria (E. coli). This work provides a simple method to prepare chitosan-based materials and obtains CZ composites with improved antibacterial activities, which can be applied in agriculture and food safety.
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