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Hydrolysis of isoflavone glycoside by immobilization of β-glucosidase on a chitosan-carbon in two-phase system.

Abstract：

:We explored a method to examine the hydrolysis of isoflavone glycoside by immobilizing β-glucosidase on chitosan-carbon beads in an aqueous-organic two-phase system. The chitosan-carbon beads were cross-linked with glutaraldehyde to immobilize β-glucosidase from Exiguobacterium sp. DAU5. The optimal pH and temperature were 9.0 and 55 °C, respectively. Under the optimized conditions, crude and purified enzymes immobilized onto chitosan-carbon beads gave yields of 16.7% and 60%, respectively. The specific activities of immobilized crude and purified enzymes were 4.3 U/g and 6 U/g, respectively. The immobilized enzyme retained more than 80% of its maximum activity at pH 7.0-11.0, while temperature was more influential (80% activity after 40 °C for 1.5 h, but only 40% activity after 55 °C for 0.5 h, respectively. The immobilized enzyme was able to hydrolyze isoflavone glycoside in an aqueous-organic two-phase system, and the hydrolyzed products were enriched in the organic phase, making it easy to recover the products, i.e., genistein and daidein from the reaction system. These results suggest that immobilized β-glucosidase may be applicable for the industrial-scale hydrolysis of isoflavone glycoside.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Chang J,Lee YS,Fang SJ,Park DJ,Choi YL

doi

10.1016/j.ijbiomac.2013.08.014

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

465-70

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(13)00438-8

journal_volume

61

pub_type

杂志文章

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