Green synthesis of gold nanoparticles using a glucan of an edible mushroom and study of catalytic activity

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• 作者：Ipsita K. Sen ; Kousik Maity ; Syed S. Islam ; ^{sirajul_1999@yahoo.com}
• 关键词：Gold nanoparticles ; Bioconjugates ; 4-Nitrophenol ; Reduction ; Pseudo-first-order kinetics
• 刊名：Carbohydrate Polymers
• 出版年：2013
• 出版时间：16 January, 2013
• 年：2013
• 卷：91
• 期：2
• 页码：518-528
• 全文大小：2113 K

文摘

Gold nanoparticles were synthesized by reducing chloroauric acid with a glucan, isolated from an edible mushroom Pleurotus florida, cultivar Assam Florida. Here, glucan acts as reducing as well as stabilizing agent. The synthesized gold nanoparticles were characterized by UV-visible spectroscopy, HR-TEM, XRD, SEM, and FT-IR analysis. The results indicated that the size distribution of gold nanoparticles (Au NPs) changed with the change in concentration of chloroauric acid (HAuCl₄). The resulting Au NPs-glucan bioconjugates function as an efficient heterogeneous catalyst in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), in the presence of sodium borohydride. The reduction of 4-nitrophenol with Au NPs-glucan bioconjugates followed pseudo-first-order kinetics. The effect of particle size and gold loading on reduction rate of 4-NP was studied with Au NPs-glucan bioconjugates prepared with different concentrations of HAuCl₄. The synthesis of catalytically active Au NPs using a pure mushroom polysaccharide of known structure is reported for the first time.