作者:Mai Thanh Thi Nguyen、Suresh Awale、Yasuhiro Tezuka、Quan Le Tran、Shigetoshi Kadota
DOI:10.1248/cpb.53.984
日期:——
From the MeOH extract of Vietnamese Caesalpinia sappan, a novel biogenetically exclusive benzindenopyran, with a new carbon framework, neoprotosappanin (1), and a new compound, protosappanin A dimethyl acetal (3), were isolated together with protosappanin E-2 (2), neosappanone A (4), and 13 previously reported phenolic compounds (5—17). Their structures were elucidated on the basis of spectroscopic data. Compounds 1—4, 7, 13, and 15—17 showed significant xanthine oxidase inhibitory activity in a concentration-dependent manner, and sappanchalcone (17) showed the most potent activity with an IC50 value of 3.9 μM, comparable to that of positive control allopurinol (IC50, 2.5 μM). The kinetic study of these inhibitors indicated that they are competitive inhibitors, the same as allopurinol, except for 1 and 16 which are noncompetitive inhibitors.
从越南苏木的甲醇提取物中分离出一种新型生物基因专有苯并吡喃化合物新原苏木素(1),以及一种新化合物原苏木素A二甲缩醛(3),还有原苏木素E-2(2)、新苏木酮A(4)和13种先前报道的酚类化合物(5-17)。根据光谱数据阐明了这些化合物的结构。化合物1-4、7、13和15-17表现出明显的黄嘌呤氧化酶抑制活性,且浓度依赖性强,而苏木查尔酮(17)表现出最强的活性,IC50值为3.9μM,与阳性对照别嘌醇(IC50,2.5μM)相当。对这些抑制剂的动力学研究表明,它们是竞争性抑制剂,与别嘌醇相同,但1和16是非竞争性抑制剂。