Green synthesis of gold nanoparticles by a newly isolated strain Trichosporon montevideense for catalytic hydrogenation of nitroaromatics.

Shen, Wenli; Qu, Yuanyuan; Pei, Xiaofang; Zhang, Xuwang; Ma, Qiao; Zhang, Zhaojing; Li, Shuzhen; Zhou, Jiti

Objective: To investigate green synthesis of gold nanoparticles (AuNPs) by Trichosporon montevideense, and to study their reduction of nitroaromatics. Results: AuNPs had a characteristic absorption maximum at 535 nm. Scanning electron microscopy images revealed that the biosynthesized nanoparticles were attached on the cell surface. X-ray diffraction analysis indicated that the particles formed as face-centered cubic (111)-oriented crystals. The average size of AuNPs decreased from 53 to 12 nm with increasing biomass concentration. The catalytic reduction of 2-nitrophenol, 3-nitrophenol, 4-nitrophenol, o-nitrophenylamine and m-nitrophenylamine (0.1 mM) by NaBH had reaction rate constants of 0.32, 0.44, 0.09, 0.24 and 0.39 min with addition of 1.45 × 10 mM AuNPs. Conclusions: An eco-friendly approach for synthesis of AuNPs by T. montevideense is reported for the first time. The biogenic AuNPs could serve as efficient catalysts for hydrogenation of various nitroaromatics.

GOLD nanoparticle synthesis; TRICHOSPORON; CATALYTIC hydrogenation; NITROAROMATIC compounds; CELL membranes

Biotechnology Letters, 2016, Vol 38, Issue 9, p1503

0141-5492

Academic Journal

10.1007/s10529-016-2120-5