The Korean Journal of Food And Nutrition (한국식품영양학회지)

The Korean Society of Food and Nutrition (한국식품영양학회)
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Development of an Indirect Non-Competitive Enzyme-Linked Immunosorbent Assay for the Detection of Cronobacter muytjensii in Infant Formula Powder

유아용 조제분유 내 Cronobacter muytjensii 검지를 위한 간접 비경합 면역분석법의 개발

  • Song, Xinjie (Dept. of Food Science and Technology, Yeungnam University) ;
  • Kim, Myunghee (Dept. of Food Science and Technology, Yeungnam University)
  • Received : 2013.12.05
  • Accepted : 2013.12.18
  • Published : 2013.12.31
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Abstract

Cronobacter muytjensii is an important foodborne pathogen as a potential risk in infant formula powder (IFP). To develop a new and sensitive method for the detection of Cronobacter spp. in IFP, an immunoglobulin G (IgG) specific for C. muytjensii (formerly known as Enterobacter sakazakii ATCC 51329) was developed. Further, an indirect noncompetitive enzyme-linked immunosorbent assay (INC-ELISA) was developed by using the anti-C. muytjensii IgG. As a result, this newly developed INC-ELISA method was found very sensitive for C. muytjensii with detection limit of $6.5{\times}10^3CFU/ml$ in pure culture and 1 cell/25 g of IFP. This INC-ELISA method also displayed excellent specificity for C. muytjensii showing no cross-reactivity with other strains of Cronobacter genus and 11 other foodborne pathogenic strains. These results show that the developed INC-ELISA method was very sensitive, efficient, and rapid for the detection of C. muytjensii. Hence, this method could be applied to the development of diagnostic kits for the rapid and easy detection of C. muytjensii.

Cronobacter muytjensii는 유아용 조제분유(IFP)의 잠재적 위험요인으로 중요한 식품 기인성 병원균이다. 이 연구에서는 C. muytjensii 검지를 위한 특이적 면역글로불린 G(IgG)를 개발하고, 이 anti-C. muytjensii IgG를 이용하여 간접 비경쟁 효소면역측정법(INC-ELISA)을 개발하였다. 그 결과, 새롭게 개발한 INC-ELISA 방법은 C. muytjensii에 매우 민감하고, 순수배양 시 $6.5{\times}10^3CFU/ml$의 검출한계와 유아용 조제분유에서 1 cell/25 g의 검출한계를 나타내었다. INC-ELISA 방법은 또한 C. muytjensii에 탁월한 특이성을 보이고, Cronobacter 속 외 11종의 다른 식품 기인성 병원균 계통과의 교차반응을 보이지 않았다. 이러한 결과는, 개발된 INC-ELISA 방법이 C. muytjensii에 매우 민감하고 효율적이며, 신속하고 용이한 검출을 위한 진단 키트 개발에 적용할 수 있음을 시사한다.

Keywords

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