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化学还原法合成银/蒙脱石/壳聚糖纳米复合材料及其抗菌活性研究。

Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity.

机构信息

Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.

出版信息

Int J Nanomedicine. 2011;6:271-84. doi: 10.2147/IJN.S16043. Epub 2011 Jan 27.

DOI:10.2147/IJN.S16043
PMID:21499424
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3075900/
Abstract

Silver nanoparticles (AgNPs) of a small size were successfully synthesized using the wet chemical reduction method into the lamellar space layer of montmorillonite/chitosan (MMT/Cts) as an organomodified mineral solid support in the absence of any heat treatment. AgNO3, MMT, Cts, and NaBH4 were used as the silver precursor, the solid support, the natural polymeric stabilizer, and the chemical reduction agent, respectively. MMT was suspended in aqueous AgNO3/Cts solution. The interlamellar space limits were changed (d-spacing = 1.24-1.54 nm); therefore, AgNPs formed on the interlayer and external surface of MMT/Cts with d-average = 6.28-9.84 nm diameter. Characterizations were done using different methods, ie, ultraviolet-visible spectroscopy, powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray fluorescence spectrometry, and Fourier transform infrared spectroscopy. Silver/montmorillonite/chitosan bionanocomposite (Ag/MMT/Cts BNC) systems were examined. The antibacterial activity of AgNPs in MMT/Cts was investigated against Gram-positive bacteria, ie, Staphylococcus aureus and methicillin-resistant S. aureus and Gram-negative bacteria, ie, Escherichia coli, E. coli O157:H7, and Pseudomonas aeruginosa by the disc diffusion method using Mueller Hinton agar at different sizes of AgNPs. All of the synthesized Ag/MMT/Cts BNCs were found to have high antibacterial activity. These results show that Ag/MMT/Cts BNCs can be useful in different biological research and biomedical applications, including surgical devices and drug delivery vehicles.

摘要

成功使用湿化学还原法将小尺寸的银纳米粒子 (AgNPs) 合成到蒙脱土/壳聚糖 (MMT/Cts) 的层状空间层中，作为无任何热处理的有机改性矿物固体支撑。AgNO3、MMT、Cts 和 NaBH4 分别用作银前体、固体支撑、天然聚合稳定剂和化学还原剂。将 MMT 悬浮在含 AgNO3/Cts 的水溶液中。层间空间的限制发生了变化（d 间距=1.24-1.54nm）；因此，AgNPs 在 MMT/Cts 的层间和外表面上形成，d 平均值为 6.28-9.84nm 直径。使用不同的方法进行了表征，即紫外-可见光谱、粉末 X 射线衍射、透射电子显微镜、扫描电子显微镜、能量色散 X 射线荧光光谱和傅里叶变换红外光谱。研究了银/蒙脱土/壳聚糖纳米复合材料（Ag/MMT/Cts BNC）系统。使用不同尺寸的 AgNPs 通过圆盘扩散法在 Mueller Hinton 琼脂上研究了 AgNPs 在 MMT/Cts 中的抗菌活性，针对革兰氏阳性菌，即金黄色葡萄球菌和耐甲氧西林金黄色葡萄球菌以及革兰氏阴性菌，即大肠杆菌、大肠杆菌 O157:H7 和铜绿假单胞菌。所有合成的 Ag/MMT/Cts BNC 均表现出很高的抗菌活性。这些结果表明，Ag/MMT/Cts BNC 可用于不同的生物研究和生物医学应用，包括手术器械和药物输送载体。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/834a/3075900/bc9c19174b91/ijn-6-271f11.jpg
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