| 摘要 |
PURPOSE:To contemplate an improvement in the problem with respect to the discoloration and fading of anthocyanin dyes, by bonding a sugar such as cyclodextrin to the hydroxyl groups in the glycoside moiety of an anthocyanin dye. CONSTITUTION:An anthocyanin dye is obtd. by bonding cyclodextrin or other sugars to the hydroxyl groups in the glycoside moiety of an anthocyanin dye. Examples of the sugars are starch, glycogen, disaccharides, monosaccharides, etc. At least mealy an equimolar amount of the sugar is used for the dye. The bonding of the sugar can be effected by bonding cyclodextrin or other sugars to the hydroxyl groups in the glycoside moiety of an anthocyanine dye in the presence of enzyme cyclodextringlycosyltransferase as a catalyst. The catalyst is an enzyme secreted from an bacterium of the genus Bacillus (e.g., B. macerans). |
