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Abstract
Extracts of edible plants (26 species) from China, Japan, Thailand and Yemen were
screened for their antibacterial activity against Bacillus cereus, Staphylococcus
aureus, Listeria monocytogenes, Escherichia coli and Salmonella infantis. Buffered
methanol (80% methanol and 20% PBS) and acetone extracted inhibitory substances against
tested bacteria from 16 plants, as revealed by the disc assay. The minimum inhibitory
concentrations (MICs) of extracts determined by the agar dilution method ranged from
165 to 2640 mg l(-1). The most sensitive microorganism to extracts from Azadirachta
indica, Cinnamomum cassia, Rumex nervosus, Ruta graveolens, Thymus serpyllum and Zingiber
officinale was B. cereus, with MIC of 165 to 660 mg l(-1). E. coli and S. infantis
were only inhibited by Cinnamomum cassia extracts at the highest MIC (2640 mg l(-1)).
L. monocytogenes (Tottori) was more resistant than the ATCC 7644 strain to extracts
from Ruta chalepensis, Artemisia absinthium and Cissus spp. EDTA (0.85 mM) reduced
the MICs of Cinnamomum cassia and Cissus rotundifolia by at least 50% when tested
against E. coli, S. infantis, S. aureus and L. monocytogenes.
Copyright 2002 Elsevier Science B.V.