基于植物质还原的银纳米颗粒的制备及在织物抗菌整理上的应用

Plant-mediated synthesis of silver nanoparticles and application in antibacterial fabric

纳米银是以纳米技术为基础研制而成的新型抗菌产品,由于量子效应和尺寸效应具有普通银系抗菌剂无法比拟的抗菌效果。本研究以黄芩、丁香、洋浦桃、芳樟4种植物质提取液制备银纳米颗粒,并借助于UV-Vis、TEM以及XRD对产物进行表征,结果表明增加植物质提取液浓度或增大Na OH加入量,均有利于制得粒径较小的银纳米颗粒。SEM图片表明采用浸渍法可将所得纳米银颗粒负载于纯棉织物上,通过考察浸渍时间、温度、浴比对织物上载银量的影响,确定较优的浸渍条件为时间30 h,温度55℃,浴比为1:25。分别考察了银纳米颗粒粒径和植物质种类对所得载银织物抗菌性能的影响,发现负载到织物上的纳米银粒径越小,织物抑菌效果越好;利用本身具有抑菌效果的黄芩、丁香来制备银纳米颗粒,有利于增强所得载银织物的整体抗菌性能;4种植物质中以黄芩制得的载银织物抗菌效果最优,对金黄色葡萄球菌、大肠杆菌等实验菌株均有强烈的抑制作用。

Nano silver, based on the nanoscience and nanotechnology, exhibits excellent antibacterial ability due to the quantum effect and size effect. In this work, the plant-mediated synthesis of silver nanoparticles （AgNPs） was reported from four plants, including Scutellaria baicalensis, Syzygium aromaticum, Syzygium samarangense and Cinnamomum camphora. The as-synthesized AgNPs were characterized by UV-Vis, TEM and XRD techniques. The results indicated that the AgNPs tended to be smaller with the increase of biomass concentration or NaOH adding amounts. SEM images verified that the AgNPs can be loaded onto cotton fabric through impregnation, and the optimal conditions were time of 30 h, temperature of 55℃ and liquor ratio of 1：25. Furthermore, the effects of AgNPs size and plant species on the antibacterial ability of the resulting Ag-coated fabrics were investigated, respectively. AgNPs loaded on the fabrics with smaller size displaied superior antibacterial activity against Escherichia coli. Moreover, Ag-coated fabrics prepared from Scutellaria baicalensis and Syzygium aromaticum extracts, which possessed own antibacterial ability, showed the cooperative antibacterial effect between biomass and nano-silver. The as-prepared fabric by the extract of Scutellaria baicalensis exhibited the best antibacterial ability with high inhibition ratio against various bacteria such as Staphylococcus aureus and Escherichia coli.