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Potentiation of Antibiotic Activity by Eugenia uniflora and Eugenia jambolanum
Henrique D.M. Coutinho,Jose´ G.M. Costa,Vivyanne S. Falca˜o-Silva,Jose´ P. Siqueira-Ju´nior,Edeltrudes O. Lima 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.4
This is the first report about the modifying antibiotic activity of Eugenia uniflora L. and Eugenia jambolanum L. In this study the ethanol extract of E. uniflora and E. jambolanum was tested for their antimicrobial activity against strains of Escherichia coli. The growth of the two strains of E. coli bacteria tested was not inhibited in a clinically relevant form by the extract. The minimal inhibitory concentration was ≥1,024μg/mL for both strains of E. coli assayed. Synergism between this extract and gentamicin was demonstrated. In the same extract synergism was observed between chlorpromazine and kanamycin and between amikacin and tobramycin, indicating the involvement of an efflux system in the resistance to these aminoglycosides. It is therefore suggested that extracts from E. uniflora L. and E. jambolanum L. could be used as a source of plant-derived natural products with modifying antibiotic activity to gentamicin.