Decolorization and detoxification of a sulfonated triphenylmethane dye aniline blue by Shewanella oneidensis MR-1 under anaerobic conditions.
In this work, the extracellular decolorization of aniline blue, a sulfonated triphenylmethane dye, by Shewanella oneidensis MR-1 was confirmed. S. oneidensis MR-1 showed a high capacity for decolorizing aniline blue even at a concentration of up to 1,000 mg/l under anaerobic conditions. Maximum decolorization efficiency appeared at pH 7.0 and 30 °C. Lactate was a better candidate of electron donor for the decolorization of aniline blue. The addition of nitrate, hydrous ferric oxide, or trimethylamine N-oxide all could cause a significant decline of decolorization efficiency. The Mtr respiratory pathway was found to be involved into the decolorization of aniline blue by S. oneidensis MR-1. The toxicity evaluation through phytotoxicity and genotoxicity showed that S. oneidensis MR-1 could decrease the toxicity of aniline blue during the decolorization process. Thus, this work may facilitate a better understanding on the degradation mechanisms of the triphenylmethane dyes by Shewanella and is beneficial to their application in bioremediation.
School of Environment, Jiangsu University, Zhenjiang 212013, China.
Yongmin
Y
Wu
Xiang
X
Xiao
Cancan
C
Xu
Danming
D
Cao
Daolin
D
Du
D000693:Anaerobiosis; D000814:Aniline Compounds / Q000378:metabolism* / Q000633:toxicity; D001711:Biotransformation; D003116:Color; D006863:Hydrogen-Ion Concentration; D007773:Lactates / Q000378:metabolism; D053858:Metabolic Networks and Pathways; D010084:Oxidation-Reduction; D020592:Shewanella / Q000378:metabolism*; D013696:Temperature
D000814:Aniline Compounds; D007773:Lactates; C017006:aniline blue