Degradation of Remazol Red Dye by Galactomyces geotrichum MTCC 1360 Leading to Increased Iron Uptake in Sorghum vulgare and Phaseolus mungo from Soil

다국어 초록 (Multilingual Abstract)

Removal of azo dyes from the effluent generated by textile industries is rather difficult. Azo dyes represent a major class of synthetic colorants that are both mutagenic and carcinogenic. Galactomyces geotrichum MTCC 1360, a yeast species, showed more than 96%decolorization of the azo dye Remazol Red (50 mg/L)within 36 h at 30oC and pH 11.0 under static condition with a significant reduction in the chemical oxygen demand (62%) and total organic carbon (41%). Peptone (5.0 g/L),rice husk (10 g/L extract), and ammonium chloride (5.0g/L) were found to be more significant among the carbon and nitrogen sources used. The presence of tyrosinase,NADH-DCIP reductase, riboflavin reductase and induction in azo reductase and laccase activity during decolorization indicated their role in degradation. High performance thin layer chromatography analysis revealed the degradation of Remazol Red into different metabolites. Fourier transform infrared spectroscopy and high performance liquid chromatography analysis of samples before and after decolorization confirmed the biotransformation of dye. Atomic absorption spectroscopy analysis revealed a less toxic effect of the metabolites on iron uptake by Sorghum vulgare and Phaseolus mungo than Remazol Red dye. Remazol Red showed an inhibitory effect on iron uptake by chelation and an immobilization of iron, whereas its metabolites showed no chelation as well as immobilization of iron. Phytotoxicity study indicated the conversion of complex dye molecules into simpler oxidizable products which had a less toxic nature.

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