Authors: Voravuthikunchai, Supayang Piyawan¹; Limsuwan, Surasak²

Source: Journal of Food Protection®, Volume 69, Number 10, October 2006 , pp. 2336-2341(6)

Publisher: International Association for Food Protection

Abstract:

Ethanolic extracts of eight Thai medicinal plants (representing five families) that are used as traditional remedies for treating diarrhea were examined with a salt aggregation test for their ability to modulate cell surface hydrophobicity of enterohemorrhagic Escherichia coli strains, including E. coli O157:H7. Four of these medicinal plants, Acacia catechu, Peltophorum pterocarpum, Punica granatum, and Quercus infectoria, have high bacteriostatic and bactericidal activities. The ethanolic extract of Q. infectoria was the most effective against all strains of E. coli, with MICs of 0.12 to 0.98 mg/ml and MBCs of 0.98 to 3.91 mg/ml. The ethanolic extract of P. granatum had MICs of 0.49 to 1.95 mg/ml and MBCs of 1.95 to 3.91 mg/ml. Ethanolic extracts of Q. infectoria, P. pterocarpum, and P. granatum were among the most effective extracts against the two strains of E. coli O157:H7. The other four plants, Andrographis paniculata, Pluchia indica, Tamarindus indica, and Walsura robusta, did not have high bacteriostatic and bactericidal activities but were able to affect hydrophobicity characteristics on their outermost surface. All plants except Q. infectoria had some ability to increase cell surface hydrophobicity. There appears to be no correlation between antibacterial activity and cell aggregative properties.

Document Type: Research article

Affiliations: 1: Department of Microbiology, Faculty of Science, Prince of Songkla University, Hatyai, Songkla 90112, Thailand; Natural Product Research Units, Faculty of Science, Prince of Songkla University, Hatyai, Songkla 90112, Thailand 2: Department of Microbiology, Faculty of Science, Prince of Songkla University, Hatyai, Songkla 90112, Thailand

Publication date: 2006-10-01

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