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Microbiology and Biotechnology Letters

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Microbiol. Biotechnol. Lett. 2010; 38(4): 405-413

병원내에서 분리된 메티실린내성 황색포도상구균에 대한 무화과잎 추출물의 항미생물효과

Synergistic Antibacterial Activity of Fig (Ficus carica) Leaves Extract Against Clinical Isolates of Methicillin-resistant Staphylococcus aureus

Young-Soo Lee and Jeong-Dan Cha

Department of Dental Hygiene, Sunmoon University, 1Department of Dental Hygiene, College of Natural Sciences, Dongeui University

Abstract

Fig (Ficus carica L.) belongs to the mulberry tree (Moraceae) which is one of the oldest fruits in the world. It has been used as a digestion promoter and a cure for ulcerative inflammation and eruption in Korea. The present study investigated the antimicrobial activity of methanol (MeOH) extract of fig leaves against methicillin-resistant Staphylococcus aureus (MRSA) isolated in clinic. The MeOH extract (MICs, 2.5 to 20 mg/mL; MBCs, 5 to 20 mg/mL) was demonstrated as antibacterial activity in isolates MRSA 1-20. The administration of the MeOH extract in combination with oxacillin or ampicillin induced a reduction of ${geq}$4-8-fold in all tested bacteria, which was considered to be synergistic based on a FICI of ${leq}$0.375-0.5. Furthermore, time-kill study was found that a combination of MeOH extract with oxacillin or ampicillin produced a more rapid decrease in the concentration of bacteria CFU/mL than MeOH extract alone. The results suggest that fig leaves could be employed as a natural antibacterial agent in MRSA infection care products.

Keywords: Ficus carica (fig), methicillin-resistant Staphylococcus aureus, antibacterial activity, minimum inhibitory concentration, minimum bactericidal concentration, synergistic effect

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