Abstract
The bacterium with dye degrading ability was isolated from effluent disposal sites of textile industries, Tirupur and was identified as Moraxella osloensis based on the biochemical and morphological characterization as well as 16S rRNA sequencing. This organism was found to decolorize 87 % of Mordant Black 17 at 100 mg l⁻¹ under shake culture condition compared to 92 % under stationary culture condition. Maximum degradation of the dye by M. osloensis was achieved when the mineral salt medium was supplemented with 0.5 % glucose and 0.1 % ammonium nitrate at 35 °C. Degradation of dye was found to follow first order kinetics with the k value of 0.06282 h⁻¹ and a R² value of 0.955. Analyses for the identification of intermediate compounds confirmed the presence of naphthalene, naphthol, naphthoquinone, salicylic acid and catechol. Based on this finding a probable pathway for the degradation of Mordant Black 17 by M. osloensis has been proposed.
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