褐藻叉开网翼藻化学成分研究

目的:对网地藻科褐藻叉开网翼藻进行化学成分研究,并对分离得到的化合物进行细胞毒活性实验。方法:利用正相硅胶柱色谱、Sephadex LH-20柱色谱、反相HPLC及重结晶等手段进行分离纯化;借助IR,MS及NMR鉴定结构;通过改良的MTT法对单体化合物进行细胞毒活性实验。结果:从叉开网翼藻中分离得到8个化合物,分别鉴定为(-)-torreyol(Ⅰ),4β,5-αdihydroxycubenol(Ⅱ),3-farnesyl--phydroxybenzioc acid(Ⅲ),chromazonarol(Ⅳ),岩藻甾醇(Ⅴ),苯乙酰胺(Ⅵ),4-羟基苯甲酸(Ⅶ)和正十六酸(Ⅷ)。结论:化合物Ⅱ和Ⅳ系首次从该海藻中发现;其余化合物均为首次从网地藻科海藻中分离得到。细胞毒活性试验结果显示所有化合物均无明显活性(IC50>10μgmL-1)。

Studies on chemical constituents of the brown alga Dictyopteris divaricata

OBJECTIVE: To investigate the chemical constituents of the brown alga D. divaricata, and to test cytotoxicities of the purified compounds. METHOD: Compounds were isolated by normal phase silica gel, Sephadex LH-20 chromatography and reverse phase HPLC techniques. Their structures were elucidated by spectroscopic methods including IR, MS and NMR. Cytotoxicities were tested by MTT method. RESULT: Eight compounds were isolated from ethanolic extract of the brown alga D. divaricata and their structures were identified as (-)-torreyol (I), 4beta, 5alpha-dihydroxycubenol (II), 3-farnesyl-p-hydroxybenzioc acid (III), chromazonarol (IV), fucosterol (V), phenyl acetylamine (VI), 4-hydroxybenzoic acid (VII) and n-hexadecanoic acid (VIII). CONCLUSION: Compound II and IV were obtained from this alga for the first time. The others were isolated from the Dictyotaceae algae for the first time. All compounds were inactive (IC50 > 10 microg x mL(-1)) against human tumor cell lines KB, Bel-7402, PC-3M, Ketr 3 and MCF-7.