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Candida albicans biofilms contribute to invasive infections and dramatic drug resistance, and anti-biofilm agents are urgently needed in the clinic. Pterostilbene (PTE) is a natural plant product with potentials to be developed as an anti-biofilm agent. In this study, we evaluated the structure-activity relationship (SAR) of PTE analogues against C. albicans biofilms. XTT (Sodium 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-2 H -tetrazolium-5-carboxanilide inner salt) reduction assay was used to evaluate the activity of the analogues against C. albicans biofilms. Knowing that hyphal formation is essential for C. albicans biofilms, anti-hyphal assay was further carried out. By comparing a series of compounds tested in this study, we found that compounds with para -hydroxy (-OH) in partition A exhibited better activity than those with other substituents in the para position, and the double bond in partition B and meta -dimethoxy (-OCH₃) in partition C both contributed to the best activity. Consistent results were obtained by anti-hyphal assay. Collectively, para -hydroxy (-OH), double bond and meta -dimethoxy (-OCH₃) are all needed for the best activity of PTE against C. albicans biofilms.

The Structure-Activity Relationship of Pterostilbene Against Candida albicans Biofilms