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Mechanisms of Gold Bioaccumulation by Filamentous Cyanobacteria From gold(III)-chloride Complex

Mechanisms of Gold Bioaccumulation by Filamentous Cyanobacteria From gold(III)-chloride Complex

Maggy F Lengke, Bruce Ravel, Michael E Fleet, Gregory Wanger, Robert A Gordon, Gordon Southam

Environ Sci Technol. 2006 Oct 15;40(20):6304-9.

PMID: 17120557

Abstract:

The mechanisms of gold bioaccumulation by cyanobacteria (Plectonema boryanum UTEX 485) from gold(III)-chloride solutions have been studied at three gold concentrations (0.8,1.7, and 7.6 mM) at 25 degrees C, using both fixed-time laboratory and real-time synchrotron radiation absorption spectroscopy (XAS) experiments. Interaction of cyanobacteria with aqueous gold(III)-chloride initially promoted the precipitation of nanoparticles of amorphous gold(I)-sulfide at the cell walls, and finally deposited metallic gold in the form of octahedral (111) platelets (approximately 10 nm to 6 microm) near cell surfaces and in solutions. The XAS results confirm that the reduction mechanism of gold(III)-chloride to metallic gold by cyanobacteria involves the formation of an intermediate Au(I) species, gold(I)-sulfide.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13453071	Gold(III) chloride		13453-07-1	Price

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