Coumaroyl flavonol glycosides from the leaves of Ginkgo biloba
2001; Elsevier BV; Volume: 58; Issue: 8 Linguagem: Inglês
10.1016/s0031-9422(01)00320-x
ISSN1873-3700
AutoresYuping Tang, Feng‐Chang Lou, Jing‐Hua Wang, Yanfang Li, Shufei Zhuang,
Tópico(s)Catalysis for Biomass Conversion
ResumoTwo coumaroyl flavonol glycosides, isorhamnetin 3-O-α-l-[6‴-p-coumaroyl-(β-d)-glucopyranosyl-(1,2)-rhamnopyranoside], and kaempferol 3-O-α-l-[6‴-p-coumaroyl-(β-d)-glucopyranosyl-(1,2)-rhamnopyranoside]-7-O-β-d-glucopyranoside, were isolated from the n-BuOH extract of Ginkgo biloba leaves. These two, together with six other flavonol glycosides, kaempferol 3-O-α-l-[6‴-p-coumaroyl-(β-d)-glucopyranosyl-(1,2)-rhamnopyranoside], quercetin 3-O-α-l-[6‴-p-coumaroyl-(β-d)-glucopyranosyl-(1,2)-rhamnopyranoside], quercetin 3-O-α-l-[6‴-p-coumaroyl-(β-d)-glucopyranosyl-(1,2)-rhamnopyranoside]-7-O-β-d-glucopyranoside, quercetin 3-O-β-d-glucopyranosyl-(1-2)-α-l-rhamnopyranoside, quercetin 3-O-β-rutinoside, and quercetin 3-O-β-d-glucopyranoside, showed profound antioxidant activities in DPPH and cytochrome-c reduction assays using the HL-60 cell culture system.
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