Antibacterial activity of Thai edible plants against gastrointestinal pathogenic bacteria and isolation of a new broad spectrum antibacterial polyisoprenylated benzophenone, chamuangone

► Twenty-two edible plant extracts have been evaluated for their antibacterial activity. ► Garcinia cowa leaf extracts exhibit antibacterial activity against all tested bacteria. ► Purification of G. cowa leaf extract affords a new polyprenylated benzophenone, chamuangone. ► Chamuangone possesses significant antibacterial activity against gastrointestinal bacteria.