Abstract:
Using a series of purification methods including silica gel, Sephadex LH-20 and preparative high performance liquid chromatography, secondary metabolites of
Myrothecium sp. were purified from the ethyl acetate extract of the solid fermentation product. Based on structure characterization and investigation on the physical and chemical properties a, twelve monomeric compounds were identified as 3''-hydroxyverrucarin A (1), verrucarin A (2), verrucarin L acetate (3), verrucarin J (4), verrucarin K (5), roridin A (6), roridin D (7), roridin H (8), roridin J (9), verrol 4-acetate (10), (3
S, 3a
S, 6
α, 6a
R)-dihydrosporothrioride (11) and 4,6-dihydroxy-1(3
H)-isobenzofuranone (12). Compounds 1, 5 and 9 -12 were isolated from
Myrothecium sp. for the first time.Compounds 2, 3, 4, 7 and 8 exhibited strong inhibitory effects on
Candida albicans, with a minimal inhibitory concentration (MIC
50) of 0.318, 0.218, 0.047, 0.569 and 0.558 μg/mL, respectively.