Journal
CHEMICAL PAPERS
Volume 69, Issue 8, Pages 1058-1066Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1515/chempap-2015-0115
Keywords
tyrosinase; silica cellular foams; immobilisation; adsorption; covalent attachment; thermal stability
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Funding
- project Biotransformations for Pharmaceutical and Cosmetics Industry - European Union within the European Regional Development Fund [POIG.01.03.01-00-158/09-00]
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Tyrosinase from Agaricus bisporus was immobilised covalently on mesostructured siliceous foam (MCF) and three mesoporous silicas of SBA-15 type of different pore sizes, regarded as the reference, to reveal that MCF was the superior enzyme support. All the carriers were functionalised using 3-aminopropyltrimethoxysilane and the enzyme was attached covalently via glutaraldehyde or by simple adsorption and it was also cross-linked with glutaraldehyde in selected samples. The experiments indicated that only tyrosinase attached covalently was highly active and that post-immobilisation cross-linking slightly reduced its activity with no improvement in stability. MCF-bound tyrosinase was the best biocatalyst with monophenolase and diphenolase activities of 3627 U mL(-1) and 53040 U mL(-1) of carrier sediment, respectively. Inactivation studies at 55 degrees C showed that MCF-bound tyrosinase was 20 times more stable than the native enzyme, whereas for typical SBA-15 it was only 12 times. A comparative study with other, non-siliceous enzyme supports indicated that aminated MCF appeared to be the carrier of choice for the covalent attachment of tyrosinase. (C) 2015 Institute of Chemistry, Slovak Academy of Sciences
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