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Evaluation of Microbial Contamination in Leek and Leek Cultivated Soil in Korea

부추와 부추 재배 토양의 미생물 오염도 조사

  • Yang, SuIn (Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences (NIAS), Rural Development Administration (RDA)) ;
  • Seo, Seung-Mi (Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences (NIAS), Rural Development Administration (RDA)) ;
  • Roh, Eunjung (Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences (NIAS), Rural Development Administration (RDA)) ;
  • Ryu, Jae-Gee (Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences (NIAS), Rural Development Administration (RDA)) ;
  • Ryu, Kyoung-Yul (Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences (NIAS), Rural Development Administration (RDA)) ;
  • Jung, Kyu-Seok (Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institute of Agricultural Sciences (NIAS), Rural Development Administration (RDA))
  • 양수인 (국립농업과학원 농산물안전성부 유해생물팀) ;
  • 서승미 (국립농업과학원 농산물안전성부 유해생물팀) ;
  • 노은정 (국립농업과학원 농산물안전성부 유해생물팀) ;
  • 류재기 (국립농업과학원 농산물안전성부 유해생물팀) ;
  • 류경열 (국립농업과학원 농산물안전성부 유해생물팀) ;
  • 정규석 (국립농업과학원 농산물안전성부 유해생물팀)
  • Received : 2019.05.29
  • Accepted : 2019.12.04
  • Published : 2019.12.30

Abstract

his study assessed microbial contamination of leeks and leek-cultivated soil. Leeks and leek-cultivated soil were collected in A and B regions and accounted for 39 and 33 samples, respectively. All of the samples were analyzed for the presence of sanitary indicator bacteria (total aerobic bacteria, coliforms and Escherichia coli), Salmonella spp., E. coli O157:H7, Listeria monocytogenes, and Bacillus cereus. In A and B region, the total aerobic bacteria was in the range of 5.87-8.78 log CFU/g for leeks and 5.94-8.45 log CFU/g for leek-cultivated soil. The coliform in leeks and leek-cultivated soil was in the range of 1.20-7.36 log CFU/g and 2.45-5.87 log CFU/g, respectively. B. cereus was detected from some of the samples while other pathogens were not detected. This study provides important background information on the microbiological safety of fresh vegetable cultivation environments.

본 연구는 부추의 안전한 재배를 위해 전국에 부추를 재배하는 지역 중 겨울재배지 A지역 3농가(I, II, III)와 여름재배지 B지역 3농가(I, II, III)를 선정하여 부추와 부추가 재배되고 있는 토양의 미생물 오염도를 조사하였다. 부추와 부추 재배 토양에서 위생지표세균(일반세균수, 대장균군, 대장균)과 병원성 미생물(B. cereus, E. coli O157:H7, Salmonella spp., L. monocytogenes)을 조사하였다. 그 결과, A지역 3농가의 부추에서 일반세균수는 5.87-8.76 log CFU/g으로 검출되었으며 r대장균군은 1.20-6.98 log CFU/g으로 검출되었다. B지역 3농가에서는 일반세균수가 6.30-7.90 log CFU/g으로 나타났으며 대장균군은 4.97-7.36 log CFU/g이었다. 또한 A지역 3농가의 부추 재배 토양에서 일반세균수는 5.94-7.48 log CFU/g으로 검출되었으며 대장균군은 2.45-5.62 log CFU/g으로 검출되었다. B지역 3농가에서는 일반세균수가 6.30-7.80 log CFU/g으로 나타났으며 대장균군은 6.17-7.40 log CFU/g으로 검출되었다. A지역과 B지역의 부추, 부추 재배 토양에서 대장균이 모두 검출되지 않았다. 두 지역의 부추와 부추 재배 토양의 병원성 미생물 분석 결과, B. cereus는 A지역의 부추 시료 30개 중 8개(26.6%) 시료에서 검출되었으며 부추 재배 토양 24개 시료 중 24개(100%) 시료에서 검출되었다. 또한 B지역 3농가는 모두 멀칭한 농가로 부추에서는 B. cereus가 검출되지 않았으며 부추 재배 토양에서 9개 시료 중 6개(66.6%) 시료에서 검출되었다. 반면에 두 지역의 부추와 부추 재배 토양에서 E. coli O157:H7, Salmonella spp., L. monocytogenes은 검출되지 않았다. 농산물에서 B. cereus와 같은 병원성 미생물의 오염은 재배단계에서 토양 등으로 인해 쉽게 오염될 수 있다. 이러한 오염을 줄이기 위해 농작물 재배 시 작물과 토양의 접촉을 최소화하기 위해 토양 멀칭재배와 온도 및 습도 등 재배환경을 관리하는 것이 미생물 오염도를 줄이는데 효과적일 것으로 판단된다. 또한 농산물로 인한 식중독 사고를 예방하기 위해서는 재배환경 모니터링 연구와 위생적인 관리방안에 대한 지속적인 연구가 필요할 것이라고 생각된다.

Keywords

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