Cayratinin, a New Anthocyanin from the Pericarp of Cayratia japonica
1970 年 83 巻 984 号 p. 179-183
詳細
1970 年 83 巻 984 号 p. 179-183
The ripe berries of Cayratia japonica get a dark purple color in late autumn. It was shown paper-chromatographically that their pericarp contains a single anthocyanin, which was obtained in an amorphous state. The pigment was an acylated anthocyanin which was degraded into three components, delphinidin, glucose and p-coumaric acid, by complete acid hydrolysis. The deacylated anthocyanin was different from each of the known delphinidin glucosides such as 3-monoglucoside, delphin (3, 5-diglucoside) and eichhornin (3-diglucoside). This new anthocyanin, cayratinin, has proved to be delphinidin 3-p-coumaroylsophorosid-5-monoglucoside by the analytical procedures of oxidative degradation with hydrogen peroxide, partial hydrolysis with dilute acid, and u. v. absorption spectrophotometry.
Besides, eichhornin which was previously described as delphinidin 3-diglucoside was shown to be 3-gentiobioside in the present experiment.
