Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Investigation of the changes in texture of soybean sprout depending on the heating conditions in sous-vide and conventional hot water cooking

Sous-vide가열과 열탕가열 조건에 따른 콩나물 머리와 줄기의 조직감 변화에 관한 연구

  • Lee, Yun Ju (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Jung, Hwabin (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Yoon, Won Byong (Department of Food Science and Biotechnology, Kangwon National University)
  • Received : 2018.05.28
  • Accepted : 2018.06.28
  • Published : 2018.09.29
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Abstract

The purpose of this study was to investigate the effect of thermal treatments, such as a sous-vide and a conventional hot water cooking, on the texture changes of soybean sprout. A novel method to measure texture properties of soybean sprout have been determined because of the irregular geometry of soybean sprout. The shape of cotyledon of bean spout was accurately analyzed using an image processing and a geometry model. To minimize the effect of the contact area on the texture measurement, a blade type of probe was selected for the measurement. True stress was evaluated to reflect the shape changes during deformation, and demonstrated that the measurement accurately distinguished the effect of thermal treatment on the texture. Different heating time (i.e., 0, 10, 20, and 30 min) was applied for both sous-vide and conventional cooking. Thermal processing caused hardening of textures for both cotyledon and hypocotyl of soybean sprout. The conventional cooking method showed higher stress values than those of sous-vide cooking. Sprouts cooked by sous-vide released the moisture after thermal processing while sprout cooked by a conventional water bath method could hold the moisture content during thermal processing. The soybean sprouts treated by conventional cooking method showed a higher score in sensory evaluation.

본 연구에서는 형상이 일정하지 않은 콩나물의 조직감 측정 방법을 도출하고 가열처리 방법 및 시간에 따른 콩나물의 물리적 품질인자를 분석하였다. 조직감 측정을 위하여 실린더와 칼날형 프로브를 이용하여 deformation 시 프로브와 샘플이 접촉하는 면적의 고려 유무에 따라 표준편차가 적은 측정법을 평가하였다. 앞서 도출된 조직감 측정 방법으로 콩나물을 conventional cooking, sous-vide 방법을 이용하여 콩나물을 0, 10, 20, 30 min 가열 하였을 때의 물리적 품질특성을 비교하였다. 콩나물의 자엽은 조직감 측정 축 방향에 따라 유의미한 차이가 없었으며(p <0.05), 칼날형 프로브를 이용하여 프로브의 칼날과 콩나물의 장축이 수평인 방향으로 조직감을 측정하여, 프로브와 샘플이 30% deformation시 접촉하는 면적을 고려한 true stress를 측정하는 것이 표준편차가 작았다. 콩나물의 배축은 프로브와 샘플이 접촉하는 면적을 고려한 조직감 측정법을 이용하여 실린더와 칼날형 프로브로 측정 시 모두 유의미한 차이를 보였다. 또한, 가열처리 방법에 따른 조직감 측정 결과와 관능평가 결과 사이에는 상관관계가 있었으며, 콩나물은 conventional cooking 방법으로 가열하는 것이 관능평가에서 더 높은 점수를 얻었다.

Keywords

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