利用pTLC、硅胶、SephadexLH-20及半制备HPLC等柱色谱手段,从海洋真菌PenicilliumoxalicumSCS.GAF0023的次生代谢产物中分离得到16个化合物,波谱学数据分析鉴定为’n.butylisobutylterephthalate(1),dibutylterephthalate(2),1,3,7-trihydroxy-6-methylanthraquinone(3),1,6,7-trihydroxy-3-methoxy—anthraquinone(4),isorhodoptilometrin(5),citreorosein(6),emodin(7),methyl-3,8-dihydroxy-6-methyl-9-oxo-9H-xanthene-1-earboxylate(8),pinselin(9),secalonieacidD(10),quinolaetaeinCl(11),quinolactacinC2(12),quinolaetaeinAl(13),quinolaetaeinA2(14),quinolaetacinBl(15),3-methyl-1H-indole-2-earboxyhcacid(16)。其中,化合物1为新天然产物,化合物5和7表现出强的抗草苔虫幼虫附着活性,Ec卯值分别为3.8和6.0μg/mL;化合物10和15分别对PTPIB和cathepsinB显示中等的酶抑制活性,IC50值分别为24.0和16.0μM。
Sixteen compounds were isolated from marine-derived fungus Penicillium oxalicum SCSGAF 0023 strain. They were identified to be n-butyl isobutyl terephthalate ( 1 ), dibutyl terephthalate (2), 1,3,7-trihydroxy-6-methylanthra- quinone (3), 1,6,7-trihydroxy-3-methoxy-anthraquinone ( 4 ), isorhodoptilometrin ( 5 ), citreorosein ( 6 ), emodin (7), methyl-3,8-dihydroxy-6-methyl-9- oxo-9H-xanthene-1 -carboxylate ( 8 ), pinselin ( 9 ), secalonic acid D ( 10 ), quinolactaein C1 ( 11 ), quinolactacin C2 ( 12), quinolaetacin A, ( 13), quinolactacin A2 ( 14), quinolactaein B, ( 15 ), and 3-methyl-1H-indole-2-carboxylie acid (16) on the basis of spectroscopic analysis and comparison with literatures. Compound I was a new natural product. Compounds 5 and 7 showed strong antifouling activity with ECso values of 3.8 and 6.0 μg/ml, respectively. Compound 10 exhibited moderate inhibitory activity against PTPIB with IC50 value of 24.0 μM, and 15 showed moderate inhibitory activity against cathepsin B with IC50 value of 16.0 μM.