NDLI: Distinct and effective biotransformation of hexavalent chromium by a novel isolate under aerobic growth followed by facultative anaerobic incubation

Content Provider	Springer Nature Link
Author	Ge, Shimei Zhou, Maohong Dong, Xinjiao Lu, Yang Ge, Shichao
Copyright Year	2012
Abstract	A bacterial isolate (G161) with high Cr(VI)-reducing capacity was isolated from Cr(VI)-contaminated soil and identified as Leucobacter sp. on the basis of 16S rRNA gene sequence analysis. The isolate was a Gram-positive, aerobic rod. The hexavalent chromate-reducing capability of the isolate was investigated under three conditions of oxygen stress. The isolate was found to reduce Cr(VI) under all conditions but performed most effectively during aerobic growth followed by facultative anaerobic incubation. Under these conditions, the isolate tolerated K2Cr2O7 concentrations up to 1,000 mg/l and completely reduced 400 mg/l K2Cr2O7 within 96 h. The strain reduced Cr(VI) over a wide range of pH (6.0–11.0) and temperatures (15–45 °C) with optimum performance at pH 8.0 and 35 °C. The presence of other metals, such as Ca2+, Co2+, Cu2+, Mn2+, Ni2+, and Zn2+, induced no effect or else played a stimulatory role on Cr(VI)-reduction activity of the strain. The strain was tested for Cr(VI) removal in wastewaters and proved capable of completely reducing the contained Cr(VI). This is the novel report of a bacterial growth and Cr(VI)-reduction process under sequential aerobic growth and facultative anaerobic conditions. The study suggested that the isolate possesses a distinct capability for Cr(VI) reduction which could be harnessed for the detoxification of chromate-contaminated wastewaters.
Starting Page	2131
Ending Page	2137
Page Count	7
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	97
Issue Number	5
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-28
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Leucobacter sp G161 16S rRNA Cr(VI) pollution Aerobic growth Facultative anaerobic Cr(VI) reduction Biotechnology Microbiology Microbial Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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