In vitro assay demonstrates potent antifungal activity of (-)-virgatusin against Colletotrichum lagenarium, highlighting key chemical groups required for fungal inhibition.
Antifungal activities of the optically pure (>99%ee) (-)- and (+)-virgatusin, a tetra-substituted tetrahydrofuran lignan, were tested. (-)-Virgatusin, which is a natural product, showed highest antifungal activity against Colletotrichum lagenarium. Research on its structure-activity relationship was also performed. It was shown that two methoxy groups on 9 and 9' positions and a 3,4-methylenedioxyphenyl group on the 7 position of virgatusin were essential for high fungal growth inhibition. The part on 7'-phenyl group was not essential for activity. The 7'-(4-methoxyphenyl) derivative showed higher activity than that of (-)-virgatusin.
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Akiyama et al. (2007) studied this question.
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