Structure–Activity Relationship of Oligomeric Flavan-3-ols: Importance of the Upper-Unit B-ring Hydroxyl Groups in the Dimeric Structure for Strong Activities
摘要:
原花青素是由低聚黄烷-3-醇单位组成的,存在于各种食品(如水果、蔬菜和饮料)中,是一种具有很强生物活性的化合物。我们研究了原花青素结构中哪种元素主要负责这种功能。在这项研究中,我们阐明了 4-8 缩合二聚体黄烷-3-醇上部单元对酿酒酵母(S. cerevisiae)和宫颈上皮样癌细胞株 HeLa S3 增殖抑制活性的重要性。(-)-表没食子儿茶素-[4,8]-(-)-表没食子儿茶素-3-O-没食子酸酯,以及(+)-儿茶素-[4,8]-(-)-表没食子儿茶素,并进行了结构-活性关系(SAR)研究。 除了对葡萄孢菌的抗菌活性和对 HeLa S3 细胞的增殖抑制活性外,2,2-二苯基-l-苦基肼自由基清除活性与酚羟基数目的相关性较低。根据我们的 SAR 研究结果,我们得出结论:二聚体上部单元的 B 环羟基对于强有效的活性至关重要。
The present invention relates to a composition containing as its main component proanthocyanidin oligomer to which a substance having a phloroglucinol ring structure or resorcinol ring structure has been bonded, and reduced in the molecular weight, which is obtained by heating plant materials containing proanthocyanidin polymer or extract thereof with a substance having a phloroglucinol ring structure or resorcinol ring structure in an acidic aqueous solution, production method thereof, and uses of the composition in health products and pharmaceutical products. According to the invention, proanthocyanidin oligomer having physiological activity, to which a substance having a phloroglucinol ring structure or resorcinol ring structure has been bonded and reduced in the molecular weight to such a level that the oligomer can be absorbed into living body, which has been conventionally difficult to obtain at high yield from plant raw materials, can be produced efficiently and easily.