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Purification, characterization of laccase from Pleurotus ostreatus HK35, and optimization for congo red biodecolorization using Box–Behnken design

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Abstract

This study is the first report on purification, characterization, and application of laccase derived from the white-rot fungus, Pleurotus ostreatus HK35 (Hungary strain), in Congo Red decolorization. The purification process involved ammonium sulfate precipitation, dialysis, anion exchange chromatography, and ultrafiltration, yielding a specific laccase activity of 15.26 U/mg and a 30.21% recovery rate. The purified enzyme, with a molecular weight of approximately 34 kilodaltons, displayed optimal activity at a temperature of 60 °C and pH 4.0 when using 2,2′-azino-bis (3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) as a substrate. The enzyme maintained over 82.02 ± 1.01% of its activity at temperatures up to 50 °C after 180 min but displayed less than 5% of its activity at 60 and 70 °C. Notably, the enzyme’s activity was significantly enhanced by Pb(NO3)2, whereas β-mercaptoethanol completely inhibited the activity. Utilizing the Box–Behnken design, we optimized Congo Red decolorization efficiency to 91.05 ± 0.82% at 100 mg/L Congo Red, 1.5 mM mediator concentration, and 1.6 U/mL laccase activity. Analysis of Variance (ANOVA) suggested the model was significant, and all variables significantly influenced decolorization efficiency.

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The datasets supporting the results of this article are not publicly available but can be obtained upon reasonable request from the corresponding author.

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Acknowledgements

The authors gratefully acknowledge King Mongkut’s University of Technology North Bangkok, Thailand, for the financial support of this research project under Grant No. KMUTNB-61-GOV-03-37. They thank Miss. Kanokwan Pribwai, Miss. Pawinee Bunkasem, and Miss. Suthasinee Anukunkij for their assistance in this research project. They would also like to thank the Mushroom Research and Development Group, Biotechnology Research and Development Office, Department of Agriculture, Thailand for their contribution in supplying pertinent information concerning the origin and strain specifics of P. ostreatus HK35.

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JI conceptualized the study. JI and SP contributed to writing and editing the manuscript. JI supervised the experimental work, performed the main data analysis, and administered the project and funding. KS and SL performed the experimental work.

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Correspondence to Jantiya Isanapong.

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Ethical approval was not required.

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Not applicable as this study did not involve human participants.

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Isanapong, J., Suwannoi, K., Lertlattanapong, S. et al. Purification, characterization of laccase from Pleurotus ostreatus HK35, and optimization for congo red biodecolorization using Box–Behnken design. 3 Biotech 14, 73 (2024). https://doi.org/10.1007/s13205-024-03926-7

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  • DOI: https://doi.org/10.1007/s13205-024-03926-7

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