A New Flavonol Glycoside from Eucalyptus globulous Subsp. Maidenii

Manguro, Lawrence Onyango Arot; Mukonyi, Kavaka W.; Githiomi, Joseph K.

doi:10.1080/10575639508043206

Cited by 6 publications

(1 citation statement)

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“…Acid hydrolysis afforded rhamnose as the sugar residue. Its 1 H NMR data showed a 2H AX and a 3H ABX system characteristic of quercetin moiety [11] while the UV data recorded in MeOH and with addition of common shift reagents [8,9] suggested that the residual sugar was attached at C-3 position of the aglycone, a fact further supported by HMBC correlations as outlined in Acid hydrolysis. Compounds (1-4), 15 mg each in a mixture of 8% HCl (2 mL) and MeOH (20 mL) were separately refluxed for 2 h. The reaction mixtures were reduced under pressure to dryness, dissolved in H 2 O (3 mL) and neutralized with NaOH.…”

Section: Resultsmentioning

confidence: 84%

Further flavonol glycosides of Embelia schimperi leaves

Manguro

Ugi

Lemen

2004

Bull. Chem. Soc. Eth.

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ABSTRACT. Fractionation of the methanolic extract of Embelia schimperi leaves has led to the isolation of two novel flavonol glycosides. The compounds were characterized as isorhamnetin 3-O-rhamnoside. Also reported from the same extracts were known compounds quercetin, myricetin, quercetin 3-O-α-rhamnoside, quercetin 3-O-β-glucoside, quercetin 3-O-rutinoside, myricetin 3-O-β-xyloside, isorhamentin 3-O-β-glucoside and myricetin 3-O-β-glucoside. Their structural elucidation was accomplished using spectral measurements and chemical methods.

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Section: Resultsmentioning

confidence: 84%