目的:研究中药黄芩主要黄酮类成分及其生物活性。方法:用色谱法分离,通过理化性质及波谱方法鉴定结构,采用多菌种、应用细胞及分子水平方法测定主要黄酮类成分的生物活性。结果:分离鉴定了9个化合物,分别为黄芩素(1)、汉黄芩素(2)、千层纸素A(3)、5,7,2′,6′-四羟基黄酮(4)、粘毛黄芩素Ⅲ(5)、黄芩苷(6)、汉黄芩苷(7)、千层纸素A-7-O-β-D-葡萄糖醛酸苷(8)、白杨素-6-C-α-L-阿拉伯吡喃糖-8-C-β-D-葡萄吡喃糖苷(9)。化合物1～7中,有邻三羟基的黄芩素抗菌活性最强,且具有良好的量效关系;有邻三取代和多羟基的黄酮具有抑制白细胞介素-1β转化酶(IL-1βcoverting enzyme,ICE)的活性。结论:研究结果为建立黄芩质量控制方法提供了科学依据,并在分析二维核磁共振(nuclear magnetic resonance,NMR)数据的基础上,对化合物9的13C NMR数据进行了正确归属。
Aim To study chemical constituents from Ampelopsis grossedentata. Methods Separation and purification were performed by using silica gel, polyamide, reverse-phase silica gel, Sephadex LH-20 column chromatographic techniques and silica gel PTLC. Structures were determined by means of physicochemical properties and spectral analysis. Results Four flavonoids were separated and identified from Ampelopsis grossedentata including dihydromyricetin (1), myricetin (2), myricitrin (3), and myricetin-3-O-β-D-galactopy...
A new saikosaponin was isolated from Bupleurum chinense DC., and its structure was identified as 3β,16α,23,28,30_pentahydroxy_olean_11,13(18)_dien_3_O_β_D_glucopyranosyl(1→6)_[α_L_rhamnopyranosyl (1→4)]_β_D_glucopyranoside on the basis of chemical and spectral evidence, named as saikosaponin q_1. In addition, two known saikosaponins, 3″_O_acetyl_saikosaponin d and 3″_O_acetyl_saikosaponin b 2, were also isolated and identified from this plant for the first time.
