title: Biosynthesis of size-controlled gold nanoparticles using fungus, Penicillium sp.
abstract: The unique optoelectronic and physicochemical properties of gold nanoparticles are significantly dependent on the particle size, shape and structure. In this paper, biosynthesis of size-controlled gold nanoparticles using fungus Penicillium sp. is reported. Fungus Penicillium sp. could successfully bioreduce and nucleate AuCl4(-) ions, and lead to the assembly and formation of intracellular Au nanoparticles with spherical morphology and good monodispersity after exposure to HAuCl4 solution. Reaction temperature, as an important physiological parameter for fungus Penicillium sp. growth, could significantly control the size of the biosynthesized Au nanoparticles. The biological compositions and FTIR spectra analysis of fungus Penicillium sp. exposed to HAuCl4 solution indicated the intracellular reducing sugar played an important role in the occurrence of intracellular reduction of AuCl4(-) ions and the growth of gold nanoparticles. Furthermore, the intracellular gold nanoparticles could be easily separated from the fungal cell lysate by ultrasonication and centrifugation.
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, Biomedical Engineering Center, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: He
authors.forename: Kemin
authors.initials: K
authors.lastname: Wang
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Wang
authors.forename: Huimin
authors.initials: H
authors.lastname: Li
authors.forename: Weihong
authors.initials: W
authors.lastname: Tan
mesh_terms: D006046:Gold; D007700:Kinetics; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D010407:Penicillium / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D006046:Gold