RESUMO
Two new fungal pigments named schweinitzins A and B (1-2), together with (S)-torosachrysone-8-O-methyl ether (3) and emodin-6,8-di-O-methyl ether (4) have been isolated from the methanolic extract of the fruit bodies of Xylaria schweinitzii (Xylariaceae) collected in Cuc Phuong national park, Ninh Binh province, Vietnam, by silica gel column chromatography and preparative HPLC. Their structures were elucidated by spectroscopic analysis such as IR, UV-Vis, 2D NMR and FT-ICR-MS. In addition, two compounds (1 and 3) showed strong cytotoxicity against all four cancer cell lines, KB (a human epidermal carcinoma), MCF7 (human breast carcinoma), SK-LU-I (human lung carcinoma) and HepG2 (hepatocellular carcinoma).
Assuntos
Antracenos/isolamento & purificação , Antineoplásicos/isolamento & purificação , Naftalenos/isolamento & purificação , Xylariales/química , Antracenos/química , Antracenos/farmacologia , Antineoplásicos/química , Antineoplásicos/farmacologia , Linhagem Celular Tumoral , Humanos , Espectroscopia de Ressonância Magnética , Naftalenos/química , Naftalenos/farmacologia , VietnãRESUMO
Phytochemical study on the methanol extract of the fruit bodies of Vietnamese fungus Daldinia concentrica has led to the isolation and structural elucidation of three cytotoxic constituents, 6,8-dihydroxy-3-methyl-3,4-dihydroisocoumarin (1), (22R)-hydroxylanosta-7,9(11),24-trien-3-one (2) and ergosterol (3). Their structures were elucidated by 2D-NMR and FT-ICR-MS. All the three compounds showed moderate cytotoxicity against four cancer cells, KB (a human epidermal carcinoma), MCF7 (human breast carcinoma), SK-LU-1 (human lung carcinoma) and HepG2 (hepatocellular carcinoma). In addition, the isocoumarin (1) inhibited the growth of Staphylococcus aureus with the IC50 value of 87.81 µg mL(-1).
