title: Anthocyanin-Flavonol Co-pigmentation in Blue Seed Coats of Ophiopogon jaburan.
abstract: Kaempferol 3,4'-diglucoside causing the blueing effects on anthocyanin was isolated as pale yellow needles from the blue seed coats of Ophiopogon jaburan. Petunidin 3-O-β-(2(G)-glucosylrutinoside)-5'-glucoside (ophionin) and kaempferol 3,4'-diglucoside were present at about 3.3 × 10(-2) M and 3.7 × 10(-2) M, respectively, in the fresh seed coats. At the same concentration, the mixture of both pigments in citrate phosphate buffer solution (pH 5.6) showed stable blue color, and absorption spectrum of the mixture almost coincided with that of the fresh blue seed-coat.
authors.affiliation: Department of Biology, Faculty of Science, Kumamoto University, Kurokami, Kumamoto 860, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ishikura
authors.forename: K
authors.initials: K
authors.lastname: Yoshitama