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Spectroscopic Characterization of Au3+ Biosorption by Waste Biomass of Saccharomyces Cerevisiae

Spectroscopic Characterization of Au3+ Biosorption by Waste Biomass of Saccharomyces Cerevisiae

Zhongyu Lin, Jianming Wu, Ru Xue, Yong Yang

Spectrochim Acta A Mol Biomol Spectrosc. 2005 Feb;61(4):761-5.

PMID: 15649812

Abstract:

Some spectroscopic characteristics of Au3+ biosorption by waste biomass of Saccharomyces cerevisiae have been reported in this paper. The effect of temperature on the correlation parameters of chemical kinetics and thermodynamics of the binding reaction was investigated by using AAS. XRD diffraction pattern of gold-loaded biomass revealed that the Au3+ bound on the cell wall of the biomass had been reduced into gold particle. FTIR spectrophotometry on blank and gold-loaded biomass demonstrated that active groups such as the hydroxyl group of saccharides, and the carboxylate anion of amino-acid residues, from the peptidoglycan layer on the cell wall seem to be the sites for the Au3+ binding, and the free aldehyde group of the hemiacetalic hydroxyl group from reducing sugars, i.e. the hydrolysates of the polysaccharides on the peptidoglycan layer, serving as the electron donor, in situ reduced the Au3+ to Au0. XPS and IR characterizations of the interaction between glucose and Au3+ further supported that the reduction of Au3+ to Au0 can directly occur at the aldehyde group of the reducing sugars.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS741322	Peptidoglycan from Saccharomyces cerevisiae			Price

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