Flavonoids in the acyanic flowers of Pharbitis nil
1994
Saito, N. | Cheng, J. | Ichimura, M. | Yokoi, M. | Abe, Y. | Honda, T.
In an investigation of the white, cream and pale yellow flowers of 11 acyanic cultivars and 10 acyanic strains of Pharbitis nil, eight flavonoids and six caffeic acid derivatives were detected. From the aqueous methanolic flower extracts five flavonoids were identified: 2',4,4',6'-tetrahydroxychalcone, aureusidin 4'-glucoside, R- and S-naringenin 7-glucoside, quercetin 4'- and 7-glucosides, together with chlorogenic acid and caffeic acid. These acyanic cultivars and strains were classified into five groups on the basis of their flavonoid constituents and flower colour. The regulation of anthocyanin biosynthesis in the flowers of P. nil was discussed in relation to the present flavonoid findings.
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