Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (3): 553.

• Contents • Previous Articles     Next Articles

Spectroscopic Studies on Biosorption of Ag+

XUE Ru1,LIN Zhong-Yu1*,ZHENG Jian-Gong1, WANG Qi2,YAN Chang-Ming1,CHEN Cui-Xue3,YE Qing1,FU Jin-Kun1   

  1. 1.State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemistry,Xiamen University;
    2.Hospital of Xiaman University,
    3.Department of Chemical Engineering,Xiamen University,Xiamen 361005,China
  • Received:2005-03-15 Online:2006-03-10 Published:2006-03-10

Abstract:

The biosorptive interaction of Ag+ with resting cell of Lactobacillus sp. strain A09 has been further studied on a molecular level by means of XPS,EDX,UV-Vis and FTIR techniques. The X-ray photoelectron spectroscopy(XPS) shows that the reductive ratio of the Ag+ to Ag0 by the A09 biomass reaches to about 54.5% for 3 d. The contain of amino acid residues in dry powder of the biomass such as cysteine,methionine,arginine and lysine,being capable of reducing the Ag+ to Ag0,are very small in quantity both cysteine and methionine are far less than 0.18%,and both arginine and lysine far less than 0.336%,via the analysis with quantitative energy-dispersive X-ray(EDX). The amount of the reducing sugars in the biomass is far larger than 2.71% analyzed by ultraviolet-visible spectrophotometry(UV-Vis). The chemical functional group on cell wass of the biomass such as the carboxylate anion of amino-acid residues seems to be the site for the Ag+ binding and the free aldehyde group of the hemiacetalic hydroxyl from reducing sugars,i.e. the hydrolysates of the polysaccharides from the cell wass,plays a protagonist in serving as the electron donor for reducing the Ag+ to Ag0,characterized by fourier transform infrared(FTIR) spectrophotometry.

CLC Number: 

TrendMD: