한국식품과학회지 (Korean Journal of Food Science and Technology)

한국식품과학회 (Korean Society of Food Science and Technology)
권호 표지

감마선 조사와 저염함량으로 제조한 된장의 미생물 및 품질특성 변화

Changes of Microbiological and Physicochemical Characteristics of Doenjang Prepared with Low Salt Content and Gamma Irradiation

  • 박병준 (한국원자력연구소 방사선식품.생명공학팀) ;
  • 장규섭 (충남대학교 식품공학과) ;
  • 김동호 (한국원자력연구소 방사선식품.생명공학팀) ;
  • 육홍선 (한국원자력연구소 방사선식품.생명공학팀) ;
  • 변명우 (한국원자력연구소 방사선식품.생명공학팀)
  • Park, Byoung-Jun (Team for Radiation Food Science and Biotechnology, Korea Atomic Energy Research Institute) ;
  • Jang, Kyu-Sub (Department of Food Engineering, Chungnam National University) ;
  • Kim, Dong-Ho (Team for Radiation Food Science and Biotechnology, Korea Atomic Energy Research Institute) ;
  • Yook, Hong-Sun (Team for Radiation Food Science and Biotechnology, Korea Atomic Energy Research Institute) ;
  • Byun, Myung-Woo (Team for Radiation Food Science and Biotechnology, Korea Atomic Energy Research Institute)
  • Published : 2002.02.01
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Abstract

숙성이 완료된 된장에 염도 4%의 청국장을 혼합하여 각각 염도 8%, 6%의 저염된장을 제조한 다음 0, 5, 10, 20 kGy의 감마선을 조사하여 상온에 보존하면서 보존 기간 중의 미생물 및 일반 품질 특성 변화를 살펴보았다. 미생물은 조사선량의 증가에 따라 유의적인 살균효과를 나타내어 Bacillus는 비조사구에 $10^9\;CFU/g$이던 것이 10 kGy에는 $10^5-10^6\;CFU/g$으로, 20 kGy에서는 $10^3 CFU/g$으로 감소하였고 보존기간 중 점차 증가하였다. 효모와 산생성 세균은 10 kGy 이상의 감마선 조사에 의하여 거의 제거되었으며 보존기간 중에도 검출되지 않았으나 비조사구 및 5 kGy 조사구에서는 증식하였다. pH, protease, 아미노태질소의 변화는 감마선 조사구가 비조사구에 비하여 안정적인 품질을 유지하였으나 6%-5 kGy 조사구는 보존 $6{\sim}8$주 후에 변패를 나타내었다. 시료의 관능평가 결과 8%-5kGy, 그리고 10 kGy의 감마선조사 시료에 대한 선호도가 높았으며 특히, 8%-5kGy의 시료는 시판 일반된장보다 높은 선호도를 보였다. 따라서 된장과 청국장을 혼합한 다음 감마선을 조사하여 관능 및 보존성이 우수한 저염된장을 제조하는데 필요한 적정 감마선 조사선량을 염도 6%에서는 10 kGy가, 염도 8%에서는 $5{\sim}10\;kGy$가 적합할 것으로 평가되었다.

Changes of microbiological and physicochemical characteristics of gamma irradiated Doenjang with low salt were studied. Samples were prepared by mixing the Doenjang and the Chungkukjang with 6% and 8% of salinity. The mixture was irradiated by gamma-ray with dose of 0, 5, 10, 20 kGy, and each sample was stored at $25^{\circ}C$ for 8 weeks. The results showed that the Bacillus cell was inactivated by $10^4-10^5\;cells/g$ with dose of 10 kGy, and yeast and Lactobacillus group were nearly eliminated by 10 kGy. The general quality of gamma irradiated low salt Doenjang, such as amino nitrogen, protease activity, and pH, were more stable than that of control during storage periods. The sensory evaluations showed that 8% (salt)-5 kGy and 6% (salt)-10 kGy irradiated samples were more acceptable than market purchased Doenjang. Therefore, it was considered that gamma irradiation was effective for maintaining better quality of low salt Doenjang and suitable radiation dose was 5 kGy in 8% salted, and 10 kGy in 6% salted sample.

Keywords

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