Abstract
본 연구에서는 양식 넙치의 주요 어병세균인 E. tarda, V. ichthyoenteri와 S. iniae에 대한 국내산 꿀벌로부터 분리한 봉독의 항균활성을 검색하였다. 그 결과 봉독은 폐사 납치로부터 분리한 그람음성균인 E. tarda, V. ichthyoenteri와 양성균인 S. iniae 모두에서 강한 항균 활성을 나타내는 것으로 확인되었다. 봉독은 E. tarda와 V. ichthyoenteri에 대하여 최소발육저지 농도는 각각 17.6 <TEX>${\mu}g$</TEX>/ml, 1.76 <TEX>${\mu}g$</TEX>/ml 였으며, 최소살균 농도는 34.6 <TEX>${\mu}g$</TEX>/ml, 6.8 <TEX>${\mu}g$</TEX>/ml, 항균력 지속시간은 5시간, 6시간으로 측정되었다. 또한 그람 양성균인 S. iniae에 대한 최소발육저지농도는 3.49 <TEX>${\mu}g$</TEX>/ml, 최소살균농도는 11 <TEX>${\mu}g$</TEX>/ml였으며, 항균력지속시간은 7시간으로 봉독은 매우 강한 증식 및 살균 억제력을 보였다. 뿐만 아니라, 다양한 pH 조건하에서도 향균활성이 유지되는 것으로 확인되었다. In this study, we examined antimicrobial activity of the bee venom isolated from honeybee (Apis mellifera L.) against fish pathogenic bacteria, Edwardsiella tarda, Vibrio ichthyoenteri and Streptococcus iniae of cultured olive flounder, Paralichthys olvaceus. The bee venom exhibited significant antimicrobial activity against the both Gram-negative bacteria, E. tarda and V. ichthyoenteri and Gram-positive bacteria, S. iniae. Minimum inhibitory concentration (MIC) and minimun bactericidal concentration (MBC) of the bee venom were 17.6 <TEX>${\mu}g$</TEX>/ml 34.6 <TEX>${\mu}g$</TEX>/ml against E. tarda., and 1.76 <TEX>${\mu}g$</TEX>/ml, 6.8 <TEX>${\mu}g$</TEX>/ml against V. ichthyoenteri, respectively. MIC and MBC of the bee venom were 3.49 <TEX>${\mu}g$</TEX>/ml, 11 <TEX>${\mu}g$</TEX>/ml, respectively against S. iniae. The postantibiotic effect (PAE) of the bee venom was 5 hr, 6 hr, and 7 hr against E. tarda, V ichthyoenteri, and S. iniae, respectively. In addition, its antimicrobial activity was stable under various pH conditions. According to these results, the bee venom showed the excellent antimicrobial activity against the tested pathogenic bacteria.
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