title: Green synthesis of gold nanoparticles using a glucan of an edible mushroom and study of catalytic activity.
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.
authors.affiliation: Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore 721102, West Bengal, India.
authors.forename: Ipsita K
authors.initials: IK
authors.lastname: Sen
authors.forename: Kousik
authors.initials: K
authors.lastname: Maity
authors.forename: Syed S
authors.initials: SS
authors.lastname: Islam
mesh_terms: D002384:Catalysis; D005936:Glucans / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D055772:Green Chemistry Technology; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D009596:Nitrophenols / Q000737:chemistry; D010316:Particle Size; D020076:Pleurotus / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D005936:Glucans; D009596:Nitrophenols; D006046:Gold; C024836:4-nitrophenol