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

Carbohydrate polymers (2012-11-06)
Ipsita K Sen, Kousik Maity, Syed S Islam
ABSTRACT

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 (HAuCl(4)). 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 HAuCl(4). The synthesis of catalytically active Au NPs using a pure mushroom polysaccharide of known structure is reported for the first time.

MATERIALS
Product Number
Brand
Product Description

Supelco
4-Nitrophenol solution, certified reference material, 5000 μg/mL in methanol
Sigma-Aldrich
4-Nitrophenol solution, 10 mM
Sigma-Aldrich
4-Nitrophenol, ReagentPlus®, ≥99%
Supelco
4-Nitrophenol
Sigma-Aldrich
4-Nitrophenol, spectrophotometric grade
Supelco
4-Nitrophenol, PESTANAL®, analytical standard
Supelco
Acetaminophen Related Compound F, Pharmaceutical Secondary Standard; Certified Reference Material