Reduction of Chromium-VI by Chromium Resistant Lactobacilli: A Prospective Bacterium for Bioremediation

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Authors

  • Ritesh Mishra
     ,IN
  • Vartika Sinha
     ,IN
  • Ambrose Kannan
     ,IN
  • Raj K. Upreti
     ,IN

Keywords:

Bioremediation, chromate reductase, hexavalent chromium, lactobacilli

Abstract

Chromium is a toxic heavy metal, which primarily exists in two inorganic forms, Cr (VI) and Cr (III). Highly soluble hexavalent chromium is carcinogenic due to its oxidizing nature. It is well established that the intestinal bacteria including Lactobacilli have regulatory effect on intestinal homeostasis and a breakdown in the relationship between intestinal cells and bacteria results in the manifestation of gastrointestinal (GI) disorders. In this study Cr (VI) resistance was developed in Lactobacillus strains and the reduction of Cr (VI) was evaluated. All resistant strains showed similarities with their respective normal strains and did not acquire resistance to various antibiotics. A complete bacterial reduction of 32ppm Cr (VI) was observed within 6 to 8 hours. The presence of chromate reducing enzyme have also been established following the partial purification (2 to 5 fold) and characterization of chromate reductase in Lactobacillus strains. The chromate reductase of our strains showed optimum activity at pH 6.0 and 300C. To our knowledge; these strains are fast in Cr (VI) reduction than any other known bacteria. The results suggest that chromate- resistant Lactobacillus strains would be useful for chromium detoxification from GI-tract as well as for bioremediation of hexavalent chromium from contaminated environment.

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Published

2018-08-21

How to Cite

Mishra, R., Sinha, V., Kannan, A., & Upreti, R. K. (2018). Reduction of Chromium-VI by Chromium Resistant Lactobacilli: A Prospective Bacterium for Bioremediation. Toxicology International, 19(1), 25–30. Retrieved from https://informaticsjournals.co.in/index.php/toxi/article/view/21840

Issue

Volume 19, Issue 1, January- April 2012

Section

Original Research
Received 2018-08-21
Accepted 2018-08-21
Published 2018-08-21

 

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