Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Helium dielectric barrier discharge-cold plasma treatment for microbiological safety and preservation of onion powder

유전체 방벽 방전 콜드 플라즈마 기술을 이용한 양파 분말 미생물 안전성 향상 및 품질 보존

  • Won, Mee Yeon (Department of Food Science and Technology, Seoul Women's University) ;
  • Choi, Ha Young (Department of Food Science and Technology, Seoul Women's University) ;
  • Lee, Kwang Sik (Renosem Co., Ltd.) ;
  • Min, Sea Cheol (Department of Food Science and Technology, Seoul Women's University)
  • Received : 2016.07.23
  • Accepted : 2016.08.05
  • Published : 2016.10.31
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Abstract

Efficacy of dielectric barrier discharge-cold plasma treatment (DBD-CPT) for microbial decontamination of onion powder was evaluated. Onion powder, inoculated with Escherichia coli O157:H7, Salmonella Enteritidis, or Listeria monocytogenes, was treated with helium DBD-CPT. DBD-CPT (9 kV, 20 min) inhibited E. coli O157:H7, S. Enteritidis, and L. monocytogenes by $1.4{\pm}0.5$, $2.3{\pm}0.3$, and $1.2{\pm}0.0log\;CFU/cm^2$, respectively. The inactivation levels of E. coli O157:H7, S. Enteritidis and L. monocytogenes increased by $2.2{\pm}0.1$, $2.5{\pm}0.1$ and $1.9{\pm}0.3log\;CFU/cm^2$, respectively, as water activity increased from 0.4 to 0.8, and increased by $2.3{\pm}0.4$, $2.1{\pm}0.1$ and $1.6{\pm}0.1log\;CFU/cm^2$, respectively, as the particle size increased from 0.3 to $1.0cm^2$. Neither the ascorbic acid and quercetin concentrations nor the color of onion powder was changed by DBD-CPT (p>0.05). These results demonstrate the potential for application of DBD-CPT in improving microbiological safety of onion powder while preserving the physicochemical properties.

DBD 방식의 콜드 플라즈마 처리는 양파 분말에 접종된 E. coli O157:H7, S. Enteritidis, L. monocytogenes를 효과적으로 저해시켰다. 콜드 플라즈마 처리에 의한 식중독균 억제 효과는 콜드 플라즈마 전압 증가에 따른 유의적인 차이를 보이지 않았지만, 콜드플라즈마 처리 시간에 따라 억제 효과가 유의적으로 증가함을 알 수 있었다. 또한, 양파 분말의 수분활성도가 높은 것과 입자 크기가 큰 것이 콜드 플라즈마를 이용하여 미생물을 억제 시키는데 유리하다는 것을 규명하였다. 본 연구에서 사용된 처리 조건에서의 DBD-CPT는 처리 시간과 관계없이 양파 분말의 비타민C 함량, 쿼세틴 함량, 그리고 색도에 영향을 주지 않았다. 따라서 DBD-CPT는 양파 분말의 이화학적 특성에 영향을 미치지 않으면서 CP 처리 시간, 양파 분말의 수분활성도와 크기 조절을 통해 식중독균을 효과적으로 억제 시킬 수 있음을 알 수 있었고 이로써 DBD-CPT가 양파 분말 식중독균 저감화에 사용 될 수 있는 비가열 살균 기술임을 확인 할 수 있었다.

Keywords

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