Process for producing aglycon and flavor-improved food containing the aglycon by diglycosidase, and converting agent to be used in the process
申请人:Tsuruhami Kazutaka
公开号:US20060216281A1
公开(公告)日:2006-09-28
A physiologically active substance of aglycon type, in particular, aglycon isoflavone, can be efficiently produced, without resort to any acid/alkali treatment or fermentation and substantially without changing the physical properties of a material, by treating the material with a sufficient amount of diglycosidase for a sufficient period of time at an appropriate temperature and pH so that a physiologically active substance of glycoside type contained in the material can be converted into the physiologically active substance of aglycon type. Moreover, by using diglycosidase and/or a specific enzyme preparation, the aglycon content in a protein or protein-containing food can be increased and the flavor thereof can be improved.
Minor components of isoflavones in soybeans, 7-(6-O-acetyl-β-D-glucopyranosyl)-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one (6"-O-acetyldaidzin, 5) and 7-(6-O-acetyl-β-D-glucopyranosyl)-5-hydroxy-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one (6"-O-acetylgenistin, 6), were efficiently prepared from 6"-O-malonyldaidzin (3) or 6"-O-malonylgenistin (4) by decarboxylation in N, N-dimethylformamide at 60°C in 46% or 57% yield, respectively. This reaction may explain the increase in the amount of the acetate during toasting of soybeans.