Abstract
Two cinnamate esters of catalpol were isolated from Westringia fruticosa and Westringia viminalis. They were identified as 6- O-([ Z]-4-methoxycinnamoyl)-catalpol and 6- O0([ E])-3,4-dimethyoxycinnamoyl) catalpol by spectroscopic methods. The former appears to be novel. Each exhibited antifungal activity against the plant pathogenic fungus Cladosporium cucumerinum. Minimum inhibitory doses were 10 and 25 μg, respectively, with activity persisting for 48 h in the direct TLC bioautography assay. The concentration of 6- O-([ Z]-4-methoxycinnamoyl) catalpol in the two species of Westringia was variable but detectable in all samples. Concentrations were significantly greater (P<0.05) in W. fruticosa but there was overlap between the two taxa.
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