Flavonol Glycosides from Muehlenbeckia platyclada and Their Anti-inflammatory Activity
作者:Chiao-Ting Yen、Pei-Wen Hsieh、Tsong-Long Hwang、Yu-Hsuan Lan、Fang-Rong Chang、Yang-Chang Wu
DOI:10.1248/cpb.57.280
日期:——
A new flavonol, morin-3-O-α-rhamnopyranoside (1), along with four known flavonols, kaempferol 3-O-α-rhamnopyranoside (2), kaempferol 3-O-β-glucopyranoside (3), quercetin 3-O-α-rhamnopyranoside (4) and (+)-catechin (5), were isolated from the methanolic extract of Muehlenbeckia platyclada. The structures of these compounds were determined on the basis of chemical and spectroscopic evidence, as well as acid hydrolysis of the original glycoside. Isolates were evaluated for inhibition of generation of superoxide anion, and inhibition of release of neutrophil elastase. Compound 2 showed moderate inhibition of superoxide anion generation with an IC50 value of 6.11±0.86 μg/ml; 1, 3 and 5 inhibited neutrophil elastase release with IC50 values of 3.82±0.80, 8.61±1.38 and 4.37±0.72 μg/ml, respectively, and were 15-fold more potent than phenylmethylsulfonyl fluoride (PMSF), the positive control, in this anti-inflammatory assay.
从 Muehlenbeckia platyclada 的甲醇提取物中分离出了一种新的黄酮醇,即 morin-3-O-α-rhamnopyranoside (1),以及四种已知的黄酮醇,即 kaempferol 3-O-α-rhamnopyranoside (2)、kaempferol 3-O-β-glucopyranoside (3)、槲皮素 3-O-α-rhamnopyranoside (4) 和 (+)-catechin (5)。这些化合物的结构是根据化学和光谱证据以及原始苷的酸水解而确定的。对分离物进行了抑制超氧阴离子生成和抑制中性粒细胞弹性蛋白酶释放的评估。化合物 2 对超氧阴离子的生成有中等程度的抑制作用,IC50 值为 6.11±0.86 μg/ml;化合物 1、3 和 5 对中性粒细胞弹性蛋白酶释放的抑制作用 IC50 值分别为 3.82±0.80、8.61±1.38 和 4.37±0.72 μg/ml,在该抗炎试验中的效力是阳性对照苯甲基磺酰氟(PMSF)的 15 倍。