Abstract
ABSTRACT The present study examined the antimicrobial effects of betel leaf (Piper betle) extracts against Vibrio spp. along with the isolation of the most prevalent bioactive components using a bioassay-guided purification. Following a preliminary screening, the ethanolic extract proved the most effective and performed to silica gel chromatography, followed by reversed phase HPLC to isolate the active components. By means of subsequent UHPLC-orbitrap-ion trap mass spectrometry, two compounds were identified as (E)-3-phenylprop-2-enoic acid (cinnamic acid) and [4-(1-hydroxyprop-2-enyl)phenyl] acetate (1’−hydroxychavicol acetate). The compounds showed anti-microbial activity against Vibrio species including V. parahaemolyticus, V. harveyi, V. alginolyticus, V. vulnificus and V. anguillarum. Their antibacterial action was quantified by a microdilution assay showing that cinnamic acid displays more potent activity (IC50, 21–121 µg/mL) compared to 1’-hydroxychavicol acetate (IC50, 24–365 µg/mL). These findings propose the potential use of the betel leaf as a substitute for antibiotics to combat Vibrio infections in shrimp aquaculture.
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