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Antioxidant flavonoid glycosides from aerial parts of the fern Abacopteris penangiana.

Journal of natural products (2007-10-10)
Zhongxiang Zhao, Jing Jin, Jinlan Ruan, Chenchen Zhu, Chaozhan Lin, Wei Fang, Yaling Cai
ABSTRACT

Five new flavan-4-ol glycosides, abacopterins E-I ( 5- 9), and seven known flavonoid glycosides ( 3 and 10- 15) were isolated from the aerial parts of the fern Abacopteris penangiana. Their structures were elucidated on the basis of extensive spectroscopic analysis, including HSQC, HMBC, (1)H- (1)H COSY, and ROESY, and chemical evidence. The isolated glycosides were evaluated for their antioxidant activity using the TEAC assay, and compounds 3, 5- 8, 10, 11, 14, and 15 showed TEAC values of 1.03-1.91 mM.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Quercetin 3-β-D-glucoside, ≥90% (HPLC)
Isoquercitrin, primary reference standard