Characterization of polyphenolic constituents from Sanguisorba officinalis L. and its antibacterial activity

Sanguisorba officinalis L., one kind of perennial plants, has been widely distributed in southern Europe, northern Africa and China. The objective of the present work was to evaluate the antibacterial captivities of polyphenolic extract (PE) of S. officinalis L. on five pathogenic bacteria, including Gram-negative bacteria ( Escherichia coli and Salmonella typhimurium ) and Gram-positive bacteria ( Staphylococcus aureus , Listeria monocytogenes and Bacillus subtilis ). The antibacterial activities were determined by the diameter of inhibition zone, minimum inhibitory concentration and minimum bactericidal concentration tests. The results showed that purified PE had significantly better performance in inhibiting bacteria than crude PE ( P