Congo red decolorizing activity under microcosm and decolorization of other dyes by congo red decolorizing bacteria

Issue Date

12-2009

Abstract

Congo red is a carcinogenic direct diazo dye used for the coloration of paper products. It is recalcitrant and found in effluents of paper factories. Bacteria in consortia and monocultures capable of decolorizing Congo red were isolated previously. The consortia were labeled as IRRI-1 and S22. The monocultures were labeled as SB13B, SB12D, IRRI-1C, and S22B. The consortia were able to decolorize direct black and direct violet aside from Congo red, while the monocultures, except for SB13B, were able to decolorize direct violet. The rate of decolorization by the consortia was faster than the monocultures isolated from them. Dye degradation occurred in the supernatant of sonicated cells, indicating that the dye degrading enzyme was located intracellularly. The monocultures and consortia were able to decolorize Congo red in polluted water but no decolorization of the dye was observed in clean water. The resident microorganisms and other organic matter in the polluted water could have favored dye degradation.

Source or Periodical Title

Philippine Journal of Science

ISSN

317683

Volume

138

Issue

2

Page

125-132

Document Type

Article

Language

English

Subject

Congo red decolorizing bacteria, Consortia, Direct dyes, Microcosm, Monoculture

Digital Copy

Yes

Link to Full Text

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