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Immobilization of yeast alcohol dehydrogenase by entrapment and covalent binding to polymeric supports
Author(s) -
Soni Sunil,
Desai J. D.,
Devi Surekha
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1964
Subject(s) - glutaraldehyde , immobilized enzyme , covalent bond , thermal stability , chemistry , polymer chemistry , alcohol dehydrogenase , copolymer , chitosan , ethanol , enzyme , organic chemistry , polymer
Yeast alcohol dehydrogenase (YADH), which catalyzes oxidoreductions of a broad spectrum of substrates, was immobilized by entrapping it into a network of a poly(acrylamide‐ co ‐hydroxyethyl methacrylate) copolymer and was also covalently bound onto porous chitosan beads activated through glutaraldehyde. Maximum retention of YADH activity achieved was 90 and 24% for entrapment and covalent binding, respectively. The results obtained for thermal, storage, and operational stability of entrapped and covalently bound YADH were compared with free YADH. The immobilized enzyme showed improved thermal and storage stability. The immobilized enzymes also retained 50% activity after six and eight cycles. Enzyme‐catalyzed oxidation of ethanol was observed to be diffusion‐controlled through Lineweaver–Burk plots. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1299–1305, 2001