A methanol extract of nagkesar (buds of Mammea longifolia), which showed strong radical scavenging activity, yielded 13 compounds by separations using column chromatography and HPLC. Structure elucidation of these compounds was achieved by (1)H and (13)C NMR, including DQF-COSY, TOCSY, DEPT, HMQC, HSQC, and HMBC. They include two new compounds, quercetin 3-O-(2' ',4' 'di-E-p-coumaroyl)-alpha-L-rhamno-pyranoside
Nagkesar的
甲醇提取物(Mammea longifolia的花蕾)具有很强的自由基清除活性,使用柱色谱和HPLC分离得到13种化合物。这些化合物的结构阐明是通过(1)H和(13)C NMR实现的,包括DQF-COSY,TOCSY,
DEPT,HMQC,HSQC和HMBC。它们包括两种新化合物,
槲皮素3-O-(2'',4''二-Ep-香豆酰基)-α-
L-鼠李糖吡喃糖苷和
槲皮素3-O-(3'',4''-二- (对-香豆酰基)-α-L-鼠李
吡喃糖苷以及已知化合物山ka
酚,
槲皮素,sh
草酸的异丙基二烯二氧基衍
生物,山fer
酚3-O-(2'',4'-二-Ep-香豆酰基)-α-L -鼠李
吡喃糖苷,
山奈酚3-O-(3'',4'-二-Ep-香豆酰基)-α-L-鼠李
吡喃糖苷,山emp
酚3-O-α-L-鼠李
吡喃糖苷,