Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Monitoring microbiological contamination, pre-decontamination, and irradiation status of commercial dried laver (Porphyra sp.) products

시판 유통 김의 미생물 오염도, 사전 살균처리 및 전자선 조사 여부 확인

  • Lee, Eun-Jin (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University) ;
  • Kim, Gui-Ran (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University) ;
  • Lee, Hye-Jin (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University) ;
  • Kwon, Joong-Ho (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University)
  • 이은진 (경북대학교 식품공학부.식품생물산업연구소) ;
  • 김귀란 (경북대학교 식품공학부.식품생물산업연구소) ;
  • 이혜진 (경북대학교 식품공학부.식품생물산업연구소) ;
  • 권중호 (경북대학교 식품공학부.식품생물산업연구소)
  • Received : 2016.07.28
  • Accepted : 2016.10.08
  • Published : 2017.02.28
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Abstract

Eighteen commercial laver (Porphyra sp.) products were purchased from Korean market and were monitored for their microbial contamination, pre-decontamination, and luminescence properties. The laver samples showed considerable variation in their microbial contamination, from $10-10^7CFU/g$ of total aerobic counts, <$10-10^2CFU/g$ of coliforms in 4 dried laver samples, and <$10-10^6CFU/g$ of yeasts and molds except in 3 samples. In addition, $10^2CFU/g$ of Bacillus cereus was found in one sample. DEFT/APC analysis was suitable for demonstrating whether the samples were pre-decontaminated or not, with DEFT/APC values lower than 2.0 log for non-heated samples and 1.0-8.5 log for heatprocessed samples. In photostimulated luminescence (PSL) calibration, 15 samples irradiated at 1 kGy showed positive (irradiated) values more than 5000 PCs. Furthermore, thermoluminescence (TL) analysis by separating the marker minerals from samples revealed the potential to be employed in identifying irradiation status by determining $1^{st}$ TL glow at $125-175^{\circ}C$ and TL ratio ($TL_1/TL_2$) of all the samples.

마른 김, 가공 김(구이 및 조미구이 김) 등 시판 김 제품 18종에 대하여 미생물 오염도 모니터링과 사전 살균처리 여부를 조사하였으며, 아울러 전자선 조사 여부 스크리닝 및 판별 가능성을 확인하였다. 시판 김의 일반 총 세균 농도는 <$10-10^7 CFU/g$, 대장균군은 <$10-10^2CFU/g$, 효모 및 곰팡이는 <$10-10^5CFU/g$으로 확인되었으며, 위해 미생물은 돌김 1종에서 B. cereus만이 $10^2CFU/g$ 수준으로 검출되었다. 시료의 사전살균 처리 여부 확인을 위하여 DEFT/APC를 측정한 결과, 마른 김에서는 log DEFT/APC 값이 2 이하로 나타나 사전 살균처리가 이루어지지 않았음이 확인되었고, 열처리된 구이 김 및 조미 구이 김의 경우 log DEFT/APC값이 2 이상으로 나타나, 원래 건조 김에 존재하였던 미생물의 수가 열처리로 인해 감소되었음을 알 수 있었다. 시판 김에 전자선 1 kGy를 조사한 후 DEFT/APC 분석을 실시한 결과, 조사 여부의 스크리닝이 어려운 것으로 확인되었다. 그러나 시판 김 18종의 calibrated PSL 분석(1 kGy) 결과, 14종의 시료에서 조사 여부의 스크리닝이 가능하였다. 한편 김 시료의 전자선 처리 시 조사 여부 TL 판별에서는 시판 김 18종 모두 $300^{\circ}C$ 이상에서 최대 TL glow peak를 나타내어 비조사 시료로 확인되었으며, 1 kGy로 조사한 시료는 모두 $130-170^{\circ}C$에서 최대 peak 강도를 나타냄으로써 조사 여부의 판별에서 발광분석의 적용성이 확인되었다.

Keywords

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