Biosorption and bioreduction of trivalent aurum by photosynthetic bacteria Rhodobacter capsulatus.
Biosorption has been shown to be an eco-friendly approach to remove heavy metal ions. In this study, the photosynthetic bacteria Rhodobacter capsulatus was screened and found to have strong ability to adsorb Au(III). The maximum specific uptake of living cells was over 92.43 mg HAuCl(4)/g dry weight of cell in the logarithmic phase. Biosorpion ability would be enhanced by an acidic environment. As the main cations, during biosorption the quantity of Mg(2+) exchanged was more than Na(+). Biosorbed Au(III) could be reduced by carotenoid and enzymes embedded and/or excreted by R. capsulatus, which might be the mechanism of photosynthtic bacteria metal tolerance.
Feng
Youzhi
Y
Laboratory of Biochemistry, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, China.
Yu
Yongchang
Y
Wang
Yiming
Y
Lin
Xiangui
X
D001673:Biodegradation, Environmental; D002338:Carotenoids / Q000378:metabolism; D006046:Gold / Q000378:metabolism* / Q000493:pharmacokinetics; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008274:Magnesium / Q000378:metabolism / Q000493:pharmacokinetics; D008855:Microscopy, Electron, Scanning; D016354:Rhodobacter capsulatus / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D012964:Sodium / Q000378:metabolism / Q000493:pharmacokinetics
D002338:Carotenoids; D006046:Gold; D012964:Sodium; D008274:Magnesium
Appl Environ Microbiol. 1994 Dec;60(12):4517-26
7811087
J Bacteriol. 1980 Feb;141(2):876-87
6767692
Biotechnol Bioeng. 1986 Jan;28(1):21-8
18553838
FEMS Microbiol Lett. 2006 Jan;254(2):173-81
16445743
J Bacteriol. 1992 Mar;174(5):1505-14
1537795
J Biosci Bioeng. 1999;88(4):410-5
16232636