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TitleBlue flower colour derived from flavonol anthocyanin co-pigmentation in Ceanothus papillosus
Publication TypeJournal Article
Year of Publication1997
AuthorsBloor, S.J.
Pagination1399 - 1405
Date Published1997
ISSN00319422 (ISSN)
Keywordsanthocyanin, article, Ceanothus papillosus, color, flavonol derivative, nuclear magnetic resonance spectroscopy, pigmentation, plant, stoichiometry
AbstractThe pigments responsible for the blue flower colour of Ceanothus papillosus have been identified. The colour arises from co-pigmentation between the anthocyanins and flavonols. The major anthocyanins have been identified from NMR spectroscopy and degradation studies as the novel acylated delphinidin glycosides, delphinidin 3-O-rutinoside 7-O-(6-O-p- coumaroylglucoside) 3'-O-glucoside and delphirodin 3-O-rutinoside 7.3'-di-O- (6-O-p-coumaroylglucoside), and the major flavonol is kaempferol 3-O- xylosyl-(1 → 2)-rhamnoside. The co-pigmentation effect appears to be quite specific, and does not occur to the same extent with other, more common, flavonols. The effect is particularly notable in that an extraordinary, long wavelength visible absorbtion maxima at 680 nm is produced which confers additional blueness. This is proposed to arise from a supramolecular complex of high stoichiometry.

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