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    초록·키워드

    Methicillin-resistant Staphylococcus aureus (MRSA) is a substantial contributor to morbidity and mortality. In search of a natural products capable of inhibiting this multidrug resistant bacteria, we have investigated the antimicrobialactivity of brazilein (BRZ) isolated from Caesalpinia sappan L. (Leguminosae) against 8 different strains of Staphylococcusaureus (S. aureus). New antimicrobial activity was found using the minimum inhibitory concentrations (MICs), brothdilution as well as checkerboard method. Against the 8 strains, the minimum inhibitory concentrations of BRZ were in therange of 62.5-500㎍/mL. From those results we performed the checkerboard test to determine the synergism of BRZ incombination with Hygromycin-b (HgB) against 4 strains. The combined activity of BRZ and HgB against 4 strains resultedin a fractional inhibitory concentrations index (FICI) ranging from 0.18-0.5. The effect of BRZ with HgB was found to besynergistic. We found that BRZ reduced the MICs of HgB. BRZ and HgB could lead to the development of new combinationantibiotics against MRSA infection.

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      UCI(KEPA) : I410-ECN-0101-2019-480-000587885