Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Effect of Electrolyzed Water Combined with Ultrasound and Organic Acids to Reduce Salmonella Typhimurium, Staphylococcus aureus, Bacillus cereus on Perilla Leaves

유기산 및 초음파 병용처리된 전해수를 이용한 들깻잎 중 Salmonella Typhimurium, Staphylococcus aureus, Bacillus cereus의 저감효과

  • 김세리 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 오기원 (농촌진흥청 연구정책국) ;
  • 이명희 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 정찬식 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 이서현 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 박선자 (경남과학기술대학교 제약공학과) ;
  • 박정현 (계명대학교 전통미생물자원개발 및 산업화연구센터) ;
  • 류경열 (농촌진흥청 연구정책국) ;
  • 김병석 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 김두호 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 윤종철 (농촌진흥청 국립농업과학원 농산물안전성부) ;
  • 정덕화 (경상대학교 응용생명과학부)
  • Received : 2012.03.26
  • Accepted : 2012.07.26
  • Published : 2012.09.30
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Abstract

This study was performed to compared the effectiveness of individual treatments (electrolyzed water: EW, organic acid, and ultrasound) and their combination on reducing foodborne pathogens from perilla leaves. Perilla leaves were innoculated with a cocktail of Salmonella Typhimurium, Staphylococcus aureus, Bacillus cereus. Inoculated perilla leaves were treated with EW combined with different concentration of acetic acid (0.5%, 1.0%, 1.5%, 2.0%) for 1 min at room temperature. Treatment of 3 pathogens on perilla leaves with electrolyzed water combined with ultrasound (25 kHz) and 0.5% acetic acid was also performed for 1 min. While the numbers of S. Typhimurium and B. cereus showed reduced with increasing acetic acid concentration, there is no difference in the number of S. aureus treated with EW containing 0.5% to 1.5% acetic acid. Discoloration was observed the perilla leaves treated with EW combined with more than 1.0% acetic acid. For all three pathogens, the combined treatment of EW and ultrasound resulted in additional 0.42 to 0.72 $log_{10}$ CFU/g. The maxium reductions of S. Typhimurium and B. cereus were 0.95, 1.23 $log_{10}$ CFU/g after treatment with EW combined with 0.5% acetic acid and ultrasound simultaneously. The results suggest that the treatment of EW combined with 0.5% acetic acid and ultrasound increased pathogens reduction compared to individual treatment.

본 연구는 들깻잎의 미생물 안전성을 확보하기 위하여 전해수의 세척 효과를 검정하고 아울러 전해수와 유기산, 초음파 병용처리의 효과를 검토하였다. 병용처리할 유기산을 선정하기 위하여 acetic acid, citric acid, maleic acid를 전해수 100 ppm에 2%씩 첨가하고 약 8.0 log CFU/mL 의 S. Typhimurium, B. cereus, S. aureus와 반응시켰다. 세 유기산 중 acetic acid의 상승효과가 가장 높아 첨가 농도별 저해 효과를 분석하고자 0.5, 1.0, 1.5, 2.0%씩 100 ppm 전해수에 첨가하고 배양액과 들깻잎표면에서 식중독세균 저감효과를 분석하였다. 아울러 100 ppm 전해수와 초음파 (25 KHz), 100 ppm 전해수, 0.5% acetic acid, 초음파를 병용처리를 하였다. 세 종류의 유기산 중 acetic acid의 상승효과가 가장 탁월하였고, B. cereus, S. Typhimurium은 acetic acid의 농도가 증가할수록 미생물 저감효과도 높아졌으며 2.0% 첨가시 약 1.0 $log_{10}$ CFU/g의 상승효과가 관찰되었다. S. aureus는 전해수 단독처리(2.08 $log_{10}$ CFU/g감소)에 비하여 1.5%까지는 상승효과가 없었지만 2.0% 결합처리에서 0.68 $log_{10}$ CFU/g의 상승효과가 나타났다. 한편, 들깻잎은 acetic acid의 첨가량이 0.5% 이상일 경우 변색되기 때문에 0.5% 이상 첨가하는 것은 품질적 측면에서 바람직하지 못하다. 전해수와 초음파를 병용처리하였을 때, 들깻잎 중 S. Typhimurium, B. cereus, S. aureus는 전해수 단독처리보다 0.72, 0.51, 0.42 $log_{10}$ CFU/g의 상승효과가 관찰되었고, 전해수, 초음파, 0.5% acetic acid 병용처리에 의해 0.95, 1.23 $log_{10}$ CFU/g의 상승효과가 관찰되었으나 S. aureus의 경우 전해수 단독처리와 유의적인 차이를 보이지 않았다. 따라서 본 연구의 결과를 통해 볼 때 들깻잎 중 식중독세균의 저감화를 위하여 전해수, 0.5% acetic acid와 초음파 병용처리가 가장 효과적일 것으로 사료된다.

Keywords

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