Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India.
Department of Biotechnology, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India.
Carbohydr Polym. 2014 Nov 4;112:539-45. doi: 10.1016/j.carbpol.2014.06.033. Epub 2014 Jun 23.
With a vision of finding greener materials to synthesize nanoparticles, we report the production and isolation of levan, a polysaccharide with repeating units of fructose, from Acetobacter xylinum NCIM2526. The isolated levan were characterized using potassium ferricyanide reducing power assay, Fourier transform infra-red (FTIR) spectroscopy and (1)H nuclear magnetic resonance spectroscopy ((1)H NMR). To exploit levan in nanotechnology, we present a simple and greener method to synthesize silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) using biopolymer, levan as both reducing and stabilizing agents. The morphology and stability of the AgNPs and AuNPs were examined by transmission electron microscopy (TEM) and UV-vis absorption (UV-vis) spectroscopy. The possible capping mechanism of the nanoparticles was postulated using FTIR studies. As synthesized biogenic nanoparticles showed excellent catalytic activity as evidenced from sodium borohydride mediated reduction of 4-nitro phenol and methylene blue.
受寻找更环保的材料来合成纳米粒子这一愿景的启发，我们报告了从木醋杆菌 NCIM2526 中生产和分离出具有果糖重复单元的多糖纤维二糖。使用铁氰化钾还原力测定法、傅里叶变换红外（FTIR）光谱和（1）H 核磁共振光谱（1H NMR）对分离出的纤维二糖进行了表征。为了在纳米技术中利用纤维二糖，我们提出了一种简单且环保的方法，使用生物聚合物纤维二糖作为还原剂和稳定剂来合成银纳米粒子（AgNPs）和金纳米粒子（AuNPs）。通过透射电子显微镜（TEM）和紫外-可见吸收（UV-vis）光谱研究了 AgNPs 和 AuNPs 的形态和稳定性。通过 FTIR 研究推测了纳米粒子的可能的封端机制。所合成的生物源纳米粒子表现出优异的催化活性，这可从 4-硝基苯酚和亚甲基蓝的硼氢化钠介导还原中得到证明。
