科研之友
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摘要
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, H-1-H-1 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.
