Abstract:
Two compounds (
1 and
2 ) were isolated and purified from secondary metabolites of
Colletotrichum scovillei by silica gel column chromatography, sephadex chromatography, thin layer chromatography and high-performance liquid chromatography. Their chemical structures were elucidated by spectroscopic technologies including nuclear magnetic resonance (NMR) and mass spectroscopy (MS).
1 was identified as a new ceramide 6-methyl-12-hydroxy-tetradeca-
N-(2′,3′,4′-trihydroxybutyl)-2
E,4
Z-dienamide, and
2 was the known compound sambutoxin. Compounds
1 and
2 had good antifungal activity against
Exserohilum turcicum, with EC
50 values of 11.43 μg/mL and 18.42 μg/mL, respectively. The results of
in vitro leaf assay showed that at the concentration of 800 μg/mL, compound
1 had significant effects on northern corn leaf blight and the relative control efficacy was 84.8%, which was equivalent to that of chlorothalonil.