Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Adhesion control of Campylobacter jejuni in chicken skin using emulsifiers

유화제를 이용한 계육 표면에서 Campylobacter jejuni의 부착 제어

  • Oh, Do Geon (Department of Food Science and Biotechnology, Chungbuk National University) ;
  • Kim, Kwang Yup (Department of Food Science and Biotechnology, Chungbuk National University)
  • 오도건 (충북대학교 식품생명공학과) ;
  • 김광엽 (충북대학교 식품생명공학과)
  • Received : 2020.08.24
  • Accepted : 2020.12.01
  • Published : 2020.12.31
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Abstract

To prevent contamination by Campylobacter jejuni during chicken carcass processing, the effect of emulsifiers on C. jejuni inoculated on chicken skin was investigated using confocal laser scanning microscopy. Among the 8 emulsifiers (SWA-10D, L-7D, M-7D, S-1670, L-1695, P-1670, polysorbate 20, polysorbate 80) tested for antimicrobial activity by the paper disk method, 4 emulsifiers (L-7D, L-1695, polysorbate 20, polysorbate 80) were screened further. Emulsifier L-1695 showed the largest clear zone at a concentration of 200 mg/mL. The 4 emulsifiers subjected to primary screening were screened for heat and pH stability. In the contact surface test, emulsifier L-1695 showed the lowest log CFU/㎠ value on both stainless steel and ceramic surfaces. When emulsifier L-1695 was applied via general and electrostatic spray methods, the number of C. jejuni entrapped inside chicken skin follicles was significantly reduced in both methods. In conclusion, the emulsifier L-1695 could be employed as a microbial detachment agent in the chicken carcass processing industry.

본 연구에서는 가장 빈번하게 발생하는 세균성 식중독의 원인균인 C. jejuni의 주 감염원인 계육에 대하여, 식품공전에 등재된 식품첨가물 중 유화제를 이용하여 계육에서 C. jejuni의 부착을 제어 할 수 있는 기술을 확보하고자 하였다. 8종의 유화제를 200 mg/mL의 농도에서 paper disc agar diffusion method로 C. jejuni에 대한 항균활성을 검색한 결과 L-7D, L-1695, polysorbate 20, polysorbate 80 등 4종의 유화제에서 생육억제환을 생성하였다. L-7D, L-1695, polysorbate 20, polysorbate 80 4종의 유화제를 25, 50, 100, 200 mg/mL의 농도에서 항균활성을 검색한 결과, 농도가 작아질수록 생육억제환의 크기도 줄어들었으며, 유화제 중 L-1695 샘플이 200 mg/mL에서 가장 큰 생육억제환을 생성하였다. pH 및 열에 대해 안정성을 측정한 결과 L-7D, L-1695, polysorbate 20, polysorbate 80 4종의 유화제 모두 pH 및 열에 안정성을 가지고 있다는 것을 확인하였다. 최소저해농도를 측정한 결과 다른 유화제 L-7D, polysorbate 20, polysorbate 80 샘플과 비교하였을때 L-1695 샘플이 1.56 mg/mL에서 가장 좋은 최소저해농도를 나타냈다. 최소살균 효과는 L-7D, L-1695, polysorbate 20, polysorbate 80 4종의 유화제 모두 나타나지 않았다. 접촉표면의 부착제어능력을 확인하기 위해서 stainless steel과 ceramic에서 실험한 결과, 두 접촉 표면 모두에서 L-1695 샘플 처리 시 가장 적은 생균수를 나타냈다. 앞선 실험의 종합적인 결과에 따라 L-1695 유화제를 최종적으로 선별하고, 계육 피부에 부착된 C. jejuni에 영향을 주는지 CLSM으로 분석한 결과 대조구에 비하여 conventional spray 및 electrostatic spray를 처리하였을 때 모공에 부착된 균이 대다 수 떨어졌음을 확인하였다. 그러나 생균수를 확인해 본 결과 conventional spray와 electrostatic spray 처리 시에는 유의한 차이가 나타나지 않았다. 위 결과들을 종합한 결과 C. jejuni KCTC 5327에 대하여 L-1695 유화제는 생육을 억제시키지만, 살균효과는 없는 것을 확인하였다. 그러나 L-1695 유화제는 식품접촉표면에서 캠필로박터균의 부착을 저해하는 특성을 갖고 있으며, 계육 피부에 인위접종된 C. jejuni를 효과적으로 감소시키는 것을 볼 때, 실제 도계공정에서 세척수에 포함시켜 C. jejuni의 제어에 사용될 수 있을 것으로 기대된다.

Keywords

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