Korean Journal of Food Science and Technology (한국식품과학회지)
- Volume 26 Issue 6
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- Pages.791-798
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- 1994
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- 0367-6293(pISSN)
Ohmic Heating Characteristics of Fermented Soybean Paste and Kochujang
된장 및 고추장의 Ohmic heating 특성
- Cho, Won-Il (Department of Food and Biotechnology, and Bioproducts Research Center, Yonsei University) ;
- Kim, Do-Un (Cheil Foods & Chemicals Inc.) ;
- Kim, Young-Suk (Department of Traditional Food Preparation, Yangsan Junior College) ;
- Pyun, Yu-Ryang (Department of Food and Biotechnology, and Bioproducts Research Center, Yonsei University)
- 조원일 (연세대학교 식품 생물공학과 및 생물산업소재연구센터) ;
- 김도언 (제일제당(주) 건강식품연구소) ;
- 김영숙 (양산전문대학 전통조리과) ;
- 변유량 (연세대학교 식품 생물공학과 및 생물산업소재연구센터)
- Published : 1994.12.01
Abstract
Ohmic heating is a food processing operation in which heat is internally generated within foods by the passage of alternating electric current. The process enables highly viscous paste foods such as Kochujang, and fermented soybean paste to be heated very fast. In order to develope the novel pasteurization process of paste foods, static Ohmic heating system was built, and heating characteristic during Ohmic heating under various conditions were studied. Electric conductivities of Kochujang and fermented soybean paste at room temperature were 1.865 S/m and 2.510 S/m, respectively and increased linearly with increasing temperature. Specific heating rate was highly dependent on the frequency. The highest heating rate was achieved at 5 KHz for Kochujang and 20 KHz for fermented soybean paste. Uniform heating throughout the sample was achieved during Ohmic heating with low frequency electrical currents, however above 5 KHz frequency, surface temperature was several degrees higher than the bulk.
점성이 높고 열전도도가 낮아 기존의 열전도 가열방식으로는 효과적인 살균이 어려운 고추장, 된장 등의 페이스트상 식품의 효율적인 살균 공정을 개발하기 위한 기초 연구로서 전기 저항열(Ohmic heaing)을 이용한 실험실 규모의 정치 회분식 가열 시스템을 고안하고 전기적 요소가 가열 특성에 미치는 영향을 연구 검토하여 다음의 결론을 얻었다. 1. 고추장과 된장의 상온에서의 전기 전도도는 각각 1.865 S/m 2.510 S/m였으며, Ohmic heating에 의하여 온도가 증가함에 따라 전기전도도가 거의 비례적으로 증가하는 전기적 특성을 나타내었다. 2. 상용 주파수(60 Hz)에서는 전압을 증가시킬수록 비가열 속도