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Laccase Immobilization on Copper-Magnetic Nanoparticles for Efficient Bisphenol Degradation

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Laccase activity is influenced by copper (Cu) as an inducer. In this study, laccase was immobilized on Cu and Cu-magnetic (Cu/Fe2O4) nanoparticles (NPs) to improve enzyme stability and potential applications. The Cu/Fe2O4 NPs functionally activated by 3-aminopropyltriethoxysilane and glutaraldehyde exhibited an immobilization yield and relative activity (RA) of 93.1 and 140%, respectively. Under optimized conditions, Cu/Fe2O4 NPs showed high loading of laccase up to 285 mg/g of support and maximum RA of 140% at a pH 5.0 after 24 h of incubation (4o C). Immobilized laccase, as Cu/Fe2O4-laccase, had a higher optimum pH (4.0) and temperature (45o C) than those of a free enzyme. The pH and temperature profiles were significantly improved through immobilization. Cu/Fe2O4-laccase exhibited 25-fold higher thermal stability at 65o C and retained residual activity of 91.8% after 10 cycles of reuse. The degradation of bisphenols was 3.9-fold higher with Cu/Fe2O4- laccase than that with the free enzyme. To the best of our knowledge, Rhus vernicifera laccase immobilization on Cu or Cu/Fe2O4 NPs has not yet been reported. This investigation revealed that laccase immobilization on Cu/Fe2O4 NPs is desirable for efficient enzyme loading and high relative activity, with remarkable bisphenol A degradation potential.

Abstract

Laccase activity is influenced by copper (Cu) as an inducer. In this study, laccase was immobilized on Cu and Cu-magnetic (Cu/Fe2O4) nanoparticles (NPs) to improve enzyme stability and potential applications. The Cu/Fe2O4 NPs functionally activated by 3-aminopropyltriethoxysilane and glutaraldehyde exhibited an immobilization yield and relative activity (RA) of 93.1 and 140%, respectively. Under optimized conditions, Cu/Fe2O4 NPs showed high loading of laccase up to 285 mg/g of support and maximum RA of 140% at a pH 5.0 after 24 h of incubation (4o C). Immobilized laccase, as Cu/Fe2O4-laccase, had a higher optimum pH (4.0) and temperature (45o C) than those of a free enzyme. The pH and temperature profiles were significantly improved through immobilization. Cu/Fe2O4-laccase exhibited 25-fold higher thermal stability at 65o C and retained residual activity of 91.8% after 10 cycles of reuse. The degradation of bisphenols was 3.9-fold higher with Cu/Fe2O4- laccase than that with the free enzyme. To the best of our knowledge, Rhus vernicifera laccase immobilization on Cu or Cu/Fe2O4 NPs has not yet been reported. This investigation revealed that laccase immobilization on Cu/Fe2O4 NPs is desirable for efficient enzyme loading and high relative activity, with remarkable bisphenol A degradation potential.

참고문헌 (42)

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