Abstract
Five peonidin glycosides were isolated from purple to violet flowers of Pharbitis nil and their structures determined by spectral methods. Three pigments were identified as the 6-trans-caffeate and 6,6″- trans-dicaffeate of peonidin 3-sophoroside-5-glucoside and heavenly blue anthocyanin, respectively; the other two pigments were peonidin 3-sophoroside-5-glucoside and its 4′-glucosylcaffeate which have been reported previously. These five anthocyanins were variously present in 18 bluish flowered cultivars. Heavenly blue anthocyanin was the most stable of the five pigments, when measured in neutral solution.
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