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    Acta Pharm. 2004 Sep;54(3):243-50.

    Antimicrobial activity of grapefruit seed and pulp ethanolic extract.

    Cvetnić Z, Vladimir-Knezević S.

    Source

    Department of Microbiology, Faculty of Pharmacy and Biochemistry, University of Zagreb, Croatia. zcvetnic@yahoo.com

    Abstract

    Antibacterial and antifungal activity of ethanolic extract of grapefruit (Citrus paradisi Macf., Rutaceae) seed and pulp was examined against 20 bacterial and 10 yeast strains. The level of antimicrobial effects was established using an in vitro agar assay and standard broth dilution susceptibility test. The contents of 3.92% of total polyphenols and 0.11% of flavonoids were determined spectrometrically in crude ethanolic extract. The presence of flavanones naringin and hesperidin in the extract was confirmed by TLC analysis. Ethanolic extract exibited the strongest antimicrobial effect against Salmonella enteritidis (MIC 2.06%, m/V). Other tested bacteria and yeasts were sensitive to extract concentrations ranging from 4.13% to 16.50% (m/V).

    PMID:
    15610620
    [PubMed - indexed for MEDLINE]

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