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Characterization of the Enzymatic and Biosorption Processes Involved in the Decolorization of Remazol Brilliant Blue R Dye by Pleurotus ostreatus Pellets

Summary

This research shows that oyster mushrooms (Pleurotus ostreatus) can effectively remove Remazol Brilliant Blue R dye from contaminated water. The mushroom pellets remove the dye through a combination of absorbing it on their surface and breaking it down with special enzymes called laccases and peroxidases. The study achieved 98.5% dye removal, suggesting this mushroom could be used to treat industrial wastewater from textile factories.

Background

Synthetic dyes are highly recalcitrant pollutants discharged in large volumes in industrial wastewater. Remazol Brilliant Blue R (RBBR) is an anthraquinone dye that is notable toxic organopollutant. White-rot fungi like Pleurotus ostreatus possess robust extracellular enzymatic systems with strong potential for environmental applications and dye wastewater treatment.

Objective

This study evaluated the decolorization of RBBR dye by Pleurotus ostreatus pellets in submerged culture. The research aimed to determine the participation of both biosorption and enzymatic degradation mechanisms in the decolorization process.

Results

The fungus achieved 98.5% decolorization of RBBR in culture broth and 98.0% using cell-free extracellular extract. Inactivated pellets exhibited biosorption capacity of 17 mg/g. Both laccase and dye-decolorizing peroxidase activities increased significantly in the presence of dye, suggesting enzymatic degradation as the primary mechanism.

Conclusion

Pleurotus ostreatus decolorizes RBBR through simultaneous enzymatic degradation, biosorption, and bioaccumulation processes. Enzymatic degradation is the main mechanism, while biosorption and bioaccumulation contribute to the overall process. The dye may be used as a carbon source by the fungus.
  • Published in:Journal of Fungi,
  • Study Type:Experimental Study,
  • Source: PMID: 40863524, DOI: 10.3390/jof11080572
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