Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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The Quality and Thermoluminescence Properties of Dried Pollack during Storage Following Irradiation

방사선 조사와 저장기간에 따른 북어의 품질 및 thermoluminescence 특성

  • Noh, Jung-Eun (Department of Food Science and Technology, Kyungpook National University) ;
  • Kwon, Joong-Ho (Department of Food Science and Technology, Kyungpook National University)
  • Published : 2004.10.31
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Abstract

Gamma irradiation was applied to dried pollack to improve its microbiological quality and evaluate quality stability of irradiated samples. Thermoluminescence (TL) properties of minerals separated from irradiated samples were measured for possible use in identifying irradiation treatment. Dried pollack was packaged in commercial unit (PVC film, 0.06 mm thickness) and stored at $15{\pm}1^{\circ}C$ for 6 months. Samples showed over $10^4\;CFU/g$ in total aerobic bacteria or yeasts&molds, which increased during storage, reaching $10^6-10^7\;CFU/g$ at 3rd month of storage. Irradiation at 3 kGy was effective for improving hygienic quality for 6 months, keeping microbial population under 20 CFU/g. Gamma irradiation at 3 kGy or less did not significantly influence physicochemical quality attributes, such as browning, TBA value, volatile basic nitrogen, trimethylamine, and sensory properties, whereas storage time remarkably induced quality changes of dried pollack. TL analysis was proved suitable for identifying irradiated from non-irradiated samples over 6 months of storage.

북어의 미생물학적 품질개선 및 저장안정성을 평가하기 위하여 감마선을 적용하였으며, 방사선 조사 북어의 유통 및 교역관리에 필요한 열발광 검지방법을 검토하였다. 포장된 북어포의 초기 미생물 농도는 $10^4\;CFU/g$ 수준이었으나 $15^{\circ}C$ 내외의 조건에서 3개월 저장 후에는 $10^7\;CFU/g$ 수준으로 크게 증가하였다. 그러나 3kGy 감마선 조사구에서는 저장 초기기 및 저장 6개월까지도 검출한계 이하로 나타났다. 북어의 선도 관련 인자로써 갈변도, TBA가, VBN, TMA 및 관능적 특성을 조사 직후와 저장 중 평가해 본 결과, 조사선량에 따라 다소 변화가 확인되었으나 적정선량으로 조사된 시료는 저장 중 대조구나 5 kGy 이상 조사구에 비해 안정된 품질특성을 보여주었다. 북어의 방사선 조사여부 확인을 위한 열발광 분석 결과 비 조사구의 glow curve는 $280^{\circ}C$ 부근에서 매우 낮은 peak를 나타내었고 1 kGy 이상 조사구에서는 $200^{\circ}C$ 부근에서 선량 의존적인 높은 peak를 나타내어 감마선 조사 북어의 판별이 가능하였으며, 재조사 방법에 의한 TL ratio는 조사여부 판별의 신뢰도를 높여주었다.

Keywords

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