7 ACYLATED ANTHOCYANINS IN BLUE FLOWERS OF GENTIANA

Three novel anthocyanins, delphinidin a-D-glucoside-5-O-(6-O-caffeoyl- beta-D-glucoside), delphinidin oside-5-O-(6-O-trans-p-coumaroyl-beta-D -glucoside) and delphinidin side-5-O-(6-O-trans-p-coumaroyl-beta-D-glu coside), named albireodelphin A, B and C, respectively, were isolated from the blue flowers of Gentiana cv. Albireo, along with two known an thocyanins, gentiodelphin and gentiocyanin A. The complete structure o f each anthocyanin was unambiguously determined by one- and two- dimen sional NMR and other spectral methods. Two other novel anthocyanins, d elphinidin ide)-3'-O-(6-O-trans-p-coumaroyl-beta-D-glucoside) and delp hinidin D-glucoside)-3'-O-(6-O-caffeoyl-beta-D-glucoside), named albir eodelphin D and E, respectively, were obtained as a mixture and the st ructures estimated by one- and two-dimensional NMR and other spectral methods. (C) 1997 Elsevier Science Ltd.