Isolation of antibacterial components from infusion of Caesalpinia paraguariensis bark. A bio-guided phytochemical study

► Caesalpinia paraguariensis bark extracts show bioactivity against food spoilage bacteria. ► Isolation of bioactive components from infusion by bio-guided purification. ► Ellagic acid and 3-O-methylellagic acid show bioactivity more potent than sodium benzoate. ► Extracts and components shown to be safe for human consumption.