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	A further insight into the mechanism of Ag+ biosorption by Lactobacillus sp strain A09
	Zhongyu Lin ; Chaohui Zhou ; Zhou CH(周朝晖) ; Jianming Wu ; Jianzhang Zhou ; Zhou JZ(周剑章) ; Lin Wang
	2004-09
关键词	biosorption silver Lactobacillus sp bioreduction FTIR
英文摘要	The mechanism of Ag+ biosorption by resting cell of Lactobacillus sp. strain A09 has been further investigated at the molecular level using spectroscopic techniques. The values of estimated equilibrium constants, rate constants, half-life periods and apparent enthalpies of the binding reaction were calculated via the determination of Ag+ adsorbed by the biomass using atomic absorption spectrophotometry (AAS). The reductive ratio of the Ag+ to Ag-0 by the A09 biomass was examined by X-ray photoelectron spectroscopy (XPS). Analysis for sulfur and nitrogen atomic contents in dry powder of the biomass with EA-1110 elemental analysis (EA) showed that amino acid residues retaining the reductive property of Ag+ to Ago are very small quantity, whereas glucose content in the hydrolysates of the biomass analyzed by ultraviolet-visible spectrophotometry (UV-vis) indicated that the amount of reducing sugars in the biomass is much larger than 2.71 %. The fourier transform infrared (FTIR) spectrophotometry on blank and silver-loaded biomass demonstrated that the chemical functional group such as the free aldehyde group of the hemiacetalic hydroxyl group from reducing sugars, i.e. the hydrolysates of the polysaccharides from the cell wall plays a leading role in serving as the electron donor for reducing the Ag+ to Ago. This result was further supported by characterizations on the interaction of the Ag+ with glucose using X-ray powder diffractometry (XRD) and FTIR spectroscopy. (c) 2004 Elsevier B.V. All rights reserved.
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.saa.2004.06.041]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhongyu Lin,Chaohui Zhou,Zhou CH,et al. A further insight into the mechanism of Ag+ biosorption by Lactobacillus sp strain A09[J],2004.
APA	Zhongyu Lin.,Chaohui Zhou.,周朝晖.,Jianming Wu.,Jianzhang Zhou.,...&Lin Wang.(2004).A further insight into the mechanism of Ag+ biosorption by Lactobacillus sp strain A09..
MLA	Zhongyu Lin,et al."A further insight into the mechanism of Ag+ biosorption by Lactobacillus sp strain A09".(2004).

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