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Hexyl gallates (Hexyl 3,4,5-trihydroxybenzoate) inhibits only Rhl-dependent production of rhamnolipid and pyocyanin by inhibiting RhlR, without affecting elastase production and biofilm formation which are regulated by the Las system.Hexyl gallates inhibits pigment production at 10-30 μM, but also exhibited antibacterial activity. Hexyl gallates also exhibits antibacterial activity against CV026 cells. Hexyl gallates inhibits only N-butanoyl homoserine lactone (BHL) production at 100 and 300 μM without affecting N-(3-oxododecanoyl)-l-homoserine lactone (OdDHL) and 2-heptyl-3-hydroxy-4(1 H) quinolone (PQS) production.
Hexyl gallates, an antimicrobial alternative to copper compounds, inhibits Xanthomonas citri growth in a dose-response manner, showing a more pronounced activity at the range of 30-50 μg/ml, and it targets the membrane of X . citri.