Premium
ISOLATION AND STRUCTURAL DETERMINATION OF 13 FLAVONOID GLYCOSIDES IN HIBISCUS ESCULENTUS (OKRA)
Author(s) -
Hedin P. A.,
Lamar P. L.,
Thompson A. C.,
Minyard J. P.
Publication year - 1968
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1968.tb07396.x
Subject(s) - quercetin , petal , flavonoid , biology , glycoside , botany , glucoside , anthocyanin , biochemistry , medicine , antioxidant , alternative medicine , pathology
Eleven flavonol glycosides and two anthocyanins, only one of which was previously identified, were isolated from the flower petals of okra, Hibiscus esculentus L. On the basis of chromatographic, spectral, and degradative evidence, the following structural assignments were made: quercetin 4′‐glucoside, quercetin 7‐glucoside, quercetin 5‐glucoside, quercetin 3‐diglucoside, quercetin 4′‐diglucoside, quercetin 3‐triglucoside, quercetin 5‐rhamnoglucoside, gossypetin 8‐glucoside, gossypetin 8‐rhamnoglucoside, gossypetin 3‐glucosido‐8‐rhamnoglucoside, cyanidin 4′‐glucoside, and cyanidin 3‐glucosido‐4′ glucoside. Some evidence was obtained of a pentahy‐droxy, monomethoxy‐flavone glycoside. The total flavonoid content in the red portion of the petal was 0.48% of fresh weight; that in the white portion was 2.51%. The two anthocyanins comprised 28.5% of the flavonoid content of the red flower but only a trace of the content of the white.