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Fabrication and Antibacterial Properties of Silver/Graphite Oxide/Chitosan and Silver/Reduced Graphene Oxide/Chitosan Nanocomposites
JOM ( IF 2.6 ) Pub Date : 2020-06-12 , DOI: 10.1007/s11837-020-04243-z
Mina Keshvardoostchokami , Farideh Piri , Vahab Jafarian , Abbasali Zamani

Silver/graphite oxide/chitosan and silver/reduced graphene oxide/chitosan organic–inorganic nanocomposite materials have been synthesized by a precipitation procedure using graphite oxide or reduced graphene oxide acting as stabilizer, silver acetate as Ag0 precursor, sodium hydroxide as reducing medium, and chitosan as covering agent. The synthesized nanomaterials were thoroughly characterized and their antibacterial efficacy investigated in detail, in comparison with chitosan, graphite oxide, reduced graphene oxide, silver/graphite oxide, and silver/reduced graphene oxide, against Gram-positive bacterium Corynebacterium glutamicum and Gram-negative bacterium Escherichia coli strain DH5α, over durations of 8 h and 20 h. The results confirmed that the prepared nanocomposites exhibited broad-spectrum antibacterial activity against the two bacteria. Five μL (2 g/L) of the nanocomposite samples efficiently reduced the number of bacteria from 108 colony-forming units (CFU)/mL to zero. The chitosan layer did not prevent release of Ag from the nanocomposites, demonstrating their potential use as biocidal materials for different applications.

中文翻译:

银/氧化石墨烯/壳聚糖和银/还原氧化石墨烯/壳聚糖纳米复合材料的制备和抗菌性能

银/氧化石墨/壳聚糖和银/还原氧化石墨烯/壳聚糖有机-无机纳米复合材料已通过沉淀程序合成,使用氧化石墨或还原氧化石墨烯作为稳定剂,乙酸银作为 AgO 前驱体,氢氧化钠作为还原介质,和壳聚糖作为覆盖剂。与壳聚糖、氧化石墨、还原氧化石墨烯、银/氧化石墨和银/还原氧化石墨烯相比,合成的纳米材料对革兰氏阳性菌谷氨酸棒杆菌和革兰氏阴性菌进行了彻底表征,并详细研究了它们的抗菌功效大肠杆菌菌株 DH5α,持续时间为 8 小时和 20 小时。结果证实所制备的纳米复合材料对两种细菌均表现出广谱抗菌活性。5 μL (2 g/L) 的纳米复合材料样品有效地将细菌数量从 108 个菌落形成单位 (CFU)/mL 减少到零。壳聚糖层不会阻止银从纳米复合材料中释放出来,这证明了它们作为不同应用的杀生物材料的潜在用途。
更新日期:2020-06-12
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