Li Yan-Ping, Li Yan-Hong, Zhong Jin-Dong, Li Rong-Tao
a Faculty of Life Science and Technology, Kunming University of Science and Technology , Kunming , 650500 , China.
J Asian Nat Prod Res. 2013;15(8):875-9. doi: 10.1080/10286020.2013.803475. Epub 2013 Jun 25.
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.
从日本马醉木的花朵中分离出一种新的酚苷，即苄基2-羟基-4-O-β-D-吡喃葡萄糖基苯甲酸酯（1），以及九种已知的黄酮类化合物，表儿茶素-(2→O→7,4→8)-表儿茶素（2）、双-8,8'-儿茶素基甲烷（3）、槲皮素（4）、槲皮素-3-O-α-L-阿拉伯呋喃糖苷（5）、槲皮素-3-O-α-L-鼠李吡喃糖苷（6）、落新妇苷（7）、恩格勒苷（8）、(2S,3R)-表儿茶素（9）和2',4-二羟基-4'-甲氧基-6'-O-β-D-吡喃葡萄糖基二氢查耳酮（10）。基于质谱、一维核磁共振和二维核磁共振技术对它们的结构进行了阐明。本文描述了这些化合物的分离、结构阐明以及体外抗氧化活性。
