NDLI: Chemical evidence for the mechanism of the biodecoloration of Amaranth by Trametes versicolor

Content Provider	Springer Nature Link
Author	Gavril, Mihaela Hodson, Peter V.
Copyright Year	2006
Abstract	The white-rot fungus Trametes versicolor decolorized Amaranth. The hypothesis that the carbon structure of Amaranth was broken down in smaller mass fragments was investigated analyzing the products of decoloration. FTIR spectroscopy, ion chromatography, sulfite and ammonia analysis were used to compare the culture filtrate before dye addition, with the pure dye, the culture filtrate after dye addition, and the culture filtrate during the treatment. The hypothesis of polymerization of the decoloration products was tested by spectrophotometric analysis of dialysates of the pure dye, the culture filtrate before dye addition, and the culture filtrates after dye addition and decoloration. FTIR showed that the signals typical for the azo group disappeared after decoloration, while new peaks appeared that were characteristic of substituted naphthalenic or benzenic compounds. Ion chromatography showed that the level of sulfate in the treatment increased when compared with the level of the sulfate in control, suggesting that the sulfonic groups were being stripped from Amaranth’s structure and metabolized to sulfate. Sulfite measurements for the treatment and controls showed no significant difference, and were well below the saturation concentration for sulfite in water, confirming that the medium was aerobic. Ammonia concentration did not change with the decoloration. Absorbance scans after dialysis of decolorized samples showed no new peaks, suggesting that the decoloration products were not polymerized. These observations suggests that the decoloration mechanism starts with the azo link removal, followed by desulfonation, naphthalene ring opening, and the formation of smaller mass fragments, similar to fungal metabolites.
Starting Page	103
Ending Page	124
Page Count	22
File Format	PDF
ISSN	09593993
Journal	World Journal of Microbiology and Biotechnology
Volume Number	23
Issue Number	1
e-ISSN	15730972
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-07-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amaranth Decoloration mechanism Trametes versicolor Microbiology Environmental Engineering/Biotechnology Biochemistry Biotechnology Applied Microbiology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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