Metabolites of Colletotrichum gloeosporioides, an Endophytic Fungus in Artemisia mongolica

Abstract
A new antimicrobial metabolite, named colletotric acid (1), was isolated from a liquid culture of Colletotrichum gloeosporioides, an endophytic fungus colonized inside the stem of Artemisia mongolica. The structure was determined using spectroscopic methods (EIMS and FABMS,1H and 13C NMR, 1H−1H COSY, HMBC, and HMQC). Compound 1 inhibited the growth of Bacillus subtilis, Staphylococcus aureus, and Sarcina lutea with minimal inhibitory concentrations (MICs) of 25, 50, and 50 μg/mL, respectively, and the crop pathogenic fungus Helminthosporium sativum (MIC: 50 μg/mL).