[Chemical constituents and their antitumor cytotoxic activity in leaves of Ilex centrochinensis]

To investigate the chemical constituents in leaves of Ilex centrochinensis and their antitumor bioactivity.Various chromatography techniques such as column chromatography on silica gel, Sephadex LH-20 and preparative HPLC were used to isolate and purify the compounds and their structures were identified by spectral data and physicochemical properties. Their antitumor effect was tested by MTT method.Ten compounds were isolated and identified as 1,4-benzenediol (1), (2S)-5,4'-dihydroxy-7,3'-dimethoxyflavan(2), (2S)-5,4'-dihydroxy-7-methoxyflavan (3), kaempferol (4), quercetin (5), naringenin (6), ursolic acid (7), uvaol (8), oleanolic acid (9) and beta-sitosterols (10).Compounds 1-5, 7, 8 were isolated from the species for the first time, among which compounds 1-3 were isolated from the Ilex genus for the first time. Compounds 2 and 3 showed strong cytotoxic activity against Huh7 cell lines with IC50 values of 8.98, 13.04 mg x L(-1), respectively. Compounds 7-9 exhibited weak cytotoxic activity against Caco-2 cell lines with IC50 values of 28.52, 38.28, 33.04 mg x L(-1), respectively.