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HERO ID
3228265
Reference Type
Journal Article
Title
Cr(VI) reduction by gluconolactone and hydrogen peroxide, the reaction products of fungal glucose oxidase: Cooperative interaction with organic acids in the biotransformation of Cr(VI)
Author(s)
Romo-Rodríguez, P; Acevedo-Aguilar, FJ; Lopez-Torres, A; Wrobel, K; Wrobel, K; Gutiérrez-Corona, JF
Year
2015
Is Peer Reviewed?
Yes
Journal
Chemosphere
ISSN:
0045-6535
EISSN:
1879-1298
Volume
134
Page Numbers
563-570
Language
English
PMID
25577697
DOI
10.1016/j.chemosphere.2014.12.009
Web of Science Id
WOS:000356549500077
Abstract
The Cr(VI) reducing capability of growing cells of the environmental A. tubingensis Ed8 strain is remarkably efficient compared to reference strains A. niger FGSC322 and A. tubingensis NRRL593. Extracellular glucose oxidase (GOX) activity levels were clearly higher in colonies developed in solid medium and in concentrated extracts of the spent medium of liquid cultures of the Ed8 strain in comparison with the reference strains. In addition, concentrated extracts of the spent medium of A. tubingensis Ed8, but not those of the reference strains, exhibited the ability to reduce Cr(VI). In line with this observation, it was found that A. niger purified GOX is capable of mediating the conversion of Cr(VI) to Cr(III) in a reaction dependent on the presence of glucose that is stimulated by organic acids. Furthermore, it was found that a decrease in Cr(VI) may occur in the absence of the GOX enzyme, as long as the reaction products gluconolactone and hydrogen peroxide are present; this conversion of Cr(VI) is stimulated by organic acids in a reaction that generates hydroxyl radicals, which may involve the formation of an intermediate peroxichromate(V) complex. These findings indicated that fungal glucose oxidase acts an indirect chromate reductase through the formation of Cr(VI) reducing molecules, which interact cooperatively with other fungal metabolites in the biotransformation of Cr(VI).
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Chromium VI
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January 2015 - April 2016
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Gluconates
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