SENYAWA GOLONGAN FLAVONOID PADA EKSTRAK n-BUTANOL KULIT BATANG BUNGUR (Lagerstroemia speciosa Pers.)

Abstract

Isolation and identification of flavonoid compounds from skin of Bungur (Lagerstroemia speciosa Pers.)
have been conducted. Isolation was carried out by maceration and partition, to obtain n-hexane, ethyl-acetate, and nbutanol
extracts. Concentrated n-butanol extract was purified using thin layer chromatography and column
chromatography.
Isolate F2.6 from n-butanol extract contains flavonoid compounds. Uilta Violete - Visible spectra showed
that the flavonoid compounds were flavanon or dihidroflavanol, with characteristic wavelengths from 275 to 295 nm
for Band II and 350 to 400 nm for Band I. Shifting reagents added indicated no hydroxyl group at C-3 and C-5,
hydroxyl group at C-7, no ortho-dihydroxyl group at ring A,B, or C, and O-glycoside at C-7. Infrared spectra
indicated characteristic functional groups of O-H bonded, CH alifatic, C=O, C=C aromatic, C-O, and CH aromatic.
The flavonoid compounds indicated was flavanon group, which has functional groups of O-H bonded, CH
alifatic, C=O, C=C aromatic, C-O, and CH aromatic, and hydroxyl group at C-7. It does not have ortho-dihydroxyl
group at ring A,B, or C, but has O-glycoside at C-7.