一株藤壶内生真菌的次生代谢产物
Secondary metabolites of the endophytic fungus Aspergillus sp.Dq-25 from barnacle
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摘要: 采用硅胶、Sephadex LH-20、C18反相硅胶和重结晶等分离技术从藤壶内生真菌Aspergillus sp.Dq-25的大米固体发酵产物的乙酸乙酯提取物中分离得到6个化合物,并通过理化性质和波谱学方法对单体化合物进行结构鉴定,分别为:demethyldihydropenicillic acid(1)、dihydropenicillic acid(2)、penicillic acid(3)、fortisterol(4)、22E,24R-3P,5a-dihydroxyerogosta-7,22-diene-6-one(5)和(22E,24R)-麦角甾-7,22-二烯-3β,5α,9α-三醇-6-酮(6)。其中化合物1为一新的丁内酯类化合物。通过MTT法测试化合物的细胞毒活性,结果显示化合物3对人慢性髓原白血病细胞K562、人宫颈癌细胞HeLa、人胃癌细胞SGC-7901、人肺癌细胞A549和人肝癌细胞BEL-7402均有一定的抑制作用,其IC50范围为38.0 ~ 105.0 μmol/L。Abstract: The chemical constituents of solid rice culture of the endophytic fungus Aspergillus sp.Dq-25 from barnacle were isolated and purified by silica gel, Sephadex LH-20, C18 reversed silica gel column chromatography and recrystallization.Their structures were identified by the physical and chemical properties, and by various spectroscopic methods.Six compounds were isolated and identified as: demethyldihydropenicillic acid (1), dihydropenicillic acid (2), penicillic acid (3), fortisterol (4), 22E, 24R-3P, 5a-dihydroxyerogosta-7, 22-diene-6-one (5), and (22E, 24R)-ergosterol-7, 22-diene-3β, 5α, 9α-triol-6-one (6).Compound 1 was a new butyrolactone.MTT method was used to analyze cytotoxicity, and the result showed that compound 3 exhibited inhibitory activity on five cell lines, including K562, HeLa, SGC-7901, A542 and BEL-7402, with IC50 values of 38.0 ~ 105.0 μmol/L.
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