Abstract
The efficiency of crude and partially purified Trichoderma harzianum WL1 laccase for the decolorization of synthetic dyes (Rhodamine 6G, Erioglaucine and Trypan blue) with complex aromatic structures were evaluated. Selection of dyes was based on their extensive usage in local dyeing and textile industries around the study area. Studies on the role of redox potential of laccases on dye decolorization are rarely discussed and hence, for the first time we have shown the redox mediated dye decolorizing efficiency of T. harzianum WL1 laccase with the commonly employed redox mediator 1-hydroxybenzotriazole (HBT). The process parameters such as initial dye concentration, enzyme load and HBT concentration were studied and found that they had a great influence on dye removal process. When the dyes were treated with increased concentration of enzyme, it showed a greater percentage of decolorization. Compared to the crude laccase, partially purified laccase accounts for maximum decolorization of all the dyes studied. In addition, the rate of dye decolorization was considerably enhanced in presence of 4 mM HBT. Maximum and minimum decolorization were recorded for Rhodamine 6G and Trypan blue, respectively. The results of this study further confirmed that, T. harzianum laccase was found to be suitable with HBT and this laccase-mediator system (LMS) could be applied for the decolorization of various classes of dyes.
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Sadhasivam, S., Savitha, S. & Swaminathan, K. Redox-mediated decolorization of recalcitrant textile dyes by Trichoderma harzianum WL1 laccase. World J Microbiol Biotechnol 25, 1733–1741 (2009). https://doi.org/10.1007/s11274-009-0069-4
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DOI: https://doi.org/10.1007/s11274-009-0069-4