Antioxidant phenolic glycoside and flavonoids from Pieris japonica
A new phenolic glycoside, benzyl 2-hydroxy-4-O-β-d-glucopyranosyl-benzoate (1), along with nine known flavonoids, epicatechin-(2 → O → 7,4 → 8)-ent-epicatechin (2), bis-8,8′-catechinylmethane
(3), quercetin (4), quercetin-3-O-α-l-arabinfuranoside (5), quercetin-3-O-α-l-rhamnopyranoside (6), astilbin (7), engeletin (8), (2S,3R)-ent-catechin (9), and 2′,4-dihydroxy-4′-methoxy-6′-O-β-d-glucopyranosyl
dihydrochalcone (10), was isolated from the flowers of Pieris japonica. Their structures were elucidated on the basis of MS, 1D NMR, and 2D NMR techniques. This paper describes the isolation, structural elucidation as well as in vitro antioxidant activity of these compounds.
Keywords: Pieris japonica; antioxidant activity; flavonoids; phenolic glycoside
Document Type: Research Article
Affiliations: Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
Publication date: 01 August 2013
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