The present invention provides a method for preparing a glycoside of a flavonoid compound, which comprises the step of treating flavonoid and a glycosyl donor with an enzymatic agent having glycosylation activity and being derived from the genus
Trichoderma
(preferably
Trichoderma viride
or
Trichoderma reesei
). Such a flavonoid compound includes a catechin compound or a methylated derivative thereof, and the glycosyl donor includes a carbohydrate containing a maltotriose residue (preferably maltotriose, maltotetraose, maltopentaose, maltohexaose, maltoheptaose, dextrin, γ-cyclodextrin or soluble starch). Glycosides obtained by the present invention have higher water solubility, improved taste, and increased stability. The present invention also provides novel glycosides of catechin compounds, which are obtained by the method of the present invention.
pH-promoted O-α-glucosylation of flavonoids using an engineered α-glucosidase mutant
作者:Chao Li、Jetendra Kumar Roy、Ki-Cheul Park、Art E. Cho、Jaeick Lee、Young-Wan Kim
DOI:10.1016/j.bioorg.2020.104581
日期:2021.2
Retaining glycosidasemutants lacking its general acid/base catalytic residue are originally termed thioglycoligases which synthesize thio-linked disaccharides using sugar acceptor bearing a nucleophilic thiol group. A few thioglycoligases derived from retaining α-glycosidases have been classified into a new class of catalysts, O-glycoligases which transfer sugar moiety to a hydroxy group of sugar