Antimicrobial Activities of Extracts from Sachaline Giant Knotweed Polygonum sachalinense

The antimicrobial activities of extracts from the leaves and rhizomes of Sachaline giant knotweed, Polygonum sachalinense, were examined. Of all the fractions separated using various solvents from the methanol extracts, the ethyl acetate fractions obtained from both the leaves and rhizomes had the highest antibacterial activity. Chloroform-separated fractions obtained from the rhizomes also displayed high antibacterial activity against some bacterial strains. Ethyl acetate-soluble fractions obtained from both the leaves and rhizomes showed effective growth inhibition against Bacillus brevis, Bacillus cereus, Bacillus coagulans, Curtobacterium flaccumfaciens, Staphylococcus aureus, Aeromonas hydrophila and Pseudomonas fluorescens.