alexa Uptake and Reduction of Hexavalent Chromium by Aspergillus niger and Aspergillus parasiticus
ISSN:2157-7463

Journal of Petroleum & Environmental Biotechnology
Open Access

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Research Article

Uptake and Reduction of Hexavalent Chromium by Aspergillus niger and Aspergillus parasiticus

Shugaba A1*, Buba F1, Kolo BG2, Nok AJ3, Ameh DA3 and Lori JA4
1Department of Biochemistry, Faculty of Science, University of Maiduguri, Maiduguri, Nigeria
2Department of Chemistry, Faculty of Science, University of Maiduguri, Maiduguri, Nigeria
3Department of Biochemistry, Faculty of Science, Ahmadu Bello University, Zaria, Nigeria
4Department of Chemistry, Faculty of Science, Ahmadu Bello University, Zaria, Nigeria
Corresponding Author : Dr. Shugaba A
Department of Biochemistry, University of Maiduguri
Maiduguri, Nigeria
E-mail: [email protected], [email protected] hotmail.com
Received February 15, 2012; Accepted April 11, 2012; Published April 13, 2012
Citation: Shugaba A, Buba F, Kolo BG, Nok AJ, Ameh DA, et al. (2012) Uptake and Reduction of Hexavalent Chromium by Aspergillus niger and Aspergillus parasiticus. J Phylogenetics Evol Biol 3:119. doi:10.4172/2157-7463.1000119
Copyright: © 2012 Shugaba A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

The uptake and reduction of Cr(VI) by Aspergillus niger and A. parasiticus was studied. After 96 hours of growth, the culture solutions spiked with an initial dichromate concentration of 20 mg/l, were completely decolorized and had residual Cr(VI) concentrations of only 0.74 ± 0.55 and 1.69 ± 0.29 mg/l in A. niger and A. parasiticus cultures representing Cr(VI) removal of 96.3% and 91.6%, respectively. In the A. niger culture, significantly (P < 0.01) lower Cr(VI) concentrations were observed within 72 hours of growth compared to those of A. parasiticus, but in both cultures complete removal was almost achieved by 144 hours of growth. The rate of Cr(VI) removal was 0.21 ± 0.09 mgl-1hr-1 and 0.20 ± 0.07 mgl-1hr-1 for A. niger and A. parasiticus, respectively. Cellular concentrations of Cr(VI) in the two fungi increased significantly (P < 0.05 – 0.001) with increasing concentrations of the dichromate treatments. Although tannic acid as sole source of carbon and energy gave significantly lower Cr(VI) removal than glucose (P < 0.001) and acetate (P < 0.01), it supported the removal of about 85.0% and 68.8% of the metal ion by A. niger and A. parasiticus, respectively. The active mycelia of both fungi showed significantly (P < 0.001) higher Cr(VI) removal than inactivated mycelia after incubation at 30°C for 72 hours. Incubation of cell – free extracts of both fungi with NADH at 30°C for 2 hours showed Cr(VI) reduction of 68.0% and 55.5% for A. niger and A. parasiticus, respectively. These findings suggest that uptake and metabolic reduction may be the process by which the two fungi are able to tolerate the toxic effects of hexavalent chromium. However, Cr removal via uptake by the two fungal biomass was observed to be in the range of 0.5 – 1.78% only, for all the concentrations applied, which is insignificant when compared with the initial Cr concentration in the culture medium. The results obtained through this investigation indicate the possibility of treating waste effluents containing hexavalent chromium using Aspergillus niger and A. parasiticus.

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