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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

Abstract

OPIYO, Sylvia A. et al. A new sterol diglycoside from Conyza floribunda. S.Afr.j.chem. (Online) [online]. 2009, vol.62, pp.163-167. ISSN 1996-840X.

Chemical investigation of CH2Cl2 and MeOH extracts of Conyza floribunda have led to the isolation of (24S)-ethylcholesta-5, 22E, 25-trien-3-0-glucosyl (1" → 4')-rhamnoside (1), (24S)-ethylcholesta-5,25-dien-3-0-β-glucoside (2), cyasterone (3), stigmasta 5,22-dien-3-acetate (4), stigmasta 5,22-dien-3-ol (5), spinasta 7,22-dien-3-ol (6), 3-oxofriedooleanane (7), 3-hydroxyfriedooleanane (8), 3-acetoxyfriedooleanane (9), betullinic acid (10), quercetin 3-0-β-glucoside (11), quercetin (12), myricetin (13) and kaempferol (14). Their structures were determined using spectroscopic and physical methods as well as comparison with data available in the literature.

Keywords : Conyza floribunda; asteraceae; triterpenes; sterols; flavonols.

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