title: Enzymatic production of epigallocatechin by using an epigallocatechin gallate hydrolase induced from Aspergillus oryzae.
abstract: Catechins are a group of polyphenolic compounds that are antioxidants having beneficial biological activities. There are four main catechins in green tea, and each has its own biological features. In order to fully exploit prominent biological activities of specific catechins and to develop new medicine from catechins, it is necessary to obtain pure catechin preparations by isolation from natural sources, by chemical synthesis, or by biotransformation reactions with high yield and specificity. In this study epigallocatechin gallate (EGCG) can be hydrolyzed to epigallocatechin (EGC) by a hydrolase from Aspergillus oryzae after induction by addition of EGCG to the cultures. However, cultures without EGCG induction did not show any EGCG hydrolysis activity. The yield of EGC could reach at least 70%. Thin layer chromatography and high performance liquid chromatography were applied to separate and quantify EGCG and EGC.
authors.affiliation: Group of Microbiological Engineering and Industrial Biotechnology, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, North Ren Min Road No.2999, Shanghai 201620, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Zhong
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Shao
authors.forename: Feng
authors.initials: F
authors.lastname: Hong
mesh_terms: D001236:Aspergillus oryzae / Q000201:enzymology*; D001711:Biotransformation; D002392:Catechin / Q000031:analogs & derivatives* / Q000096:biosynthesis / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D006867:Hydrolases / Q000737:chemistry / Q000378:metabolism*
chemical_list: D002392:Catechin; C045651:epigallocatechin gallate; D006867:Hydrolases; C057580:gallocatechol