Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality Characteristics of Tofu with Added Alfalfa (Medicago sativa L.) Extracts

알팔파 추출물을 첨가한 두부의 품질 특성

  • Kim, Sang-Eun (Dept. of Technical Research Center, Heechang Dairy Food Co. Ltd.) ;
  • Lee, Sang-Won (Dept. of Technical Research Center, Heechang Dairy Food Co. Ltd.) ;
  • Yeum, Dong-Min (Dept. of Hotel Food and Baking, Yangsan University) ;
  • Lee, Moon-Jo (Dept. of Technical Research Center, Heechang Dairy Food Co. Ltd.)
  • 김상은 ((주)희창유업 기술연구소) ;
  • 이상원 ((주)희창유업 기술연구소) ;
  • 염동민 (양산대학교 호텔외식.조리학부 호텔식품제과제빵과) ;
  • 이문조 ((주)희창유업 기술연구소)
  • Received : 2011.10.07
  • Accepted : 2011.12.08
  • Published : 2012.01.31
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Abstract

This study was conducted to investigate the quality characteristics of tofu (soybean curd) prepared with added alfalfa extracts (Medicago sativa L.). The moisture content, yield, and pH of tofu decreased according to the increase of an added quantity of alfalfa extract, whereas the crude protein and turbidity increased. The tofu made with additional alfalfa extracts gave a similar amount of crude ash with that of the control. The Hunter's L (lightness) color value decreased as the content of alfalfa extract increased, but the a (redness) and b (yellowness) values increased with increasing alfalfa extract concentration. Textural properties for hardness were higher but cohesiveness, springiness, gumminess, and brittleness were lower in alfalfa extracts with added tofu compared to those of control. Isoflavones such as daidzein and genistein content were significantly increased with increasing concentration of alfalfa extracts. A sensory evaluation indicated that the group with a 0.5% alfalfa extract showed the best color, flavor, taste, and overall acceptability results. In conclusion, adding alfalfa extracts could improve the physicochemical and sensory characteristics of tofu.

본 연구는 두부에 알팔파가 갖는 우수한 생리기능을 활용하여 기능성이 우수한 두부를 개발하고자 알팔파 추출물을 0.25, 0.5, 0.75 및 1.0% 수준으로 첨가하여 제조한 두부의 품질특성을 조사하였다. 제조된 두부의 수분 함량은 알팔파 추출물 첨가량이 증가할수록 감소하는 경향을 보였지만 무첨가 두부에 비해 높았으며, 조단백 함량은 첨가량에 따라 증가하는 경향을 보였다. 그러나 조회분의 함량은 시료 간의 차이를 보이지 않았다. 두부의 수율은 첨가량이 증가할수록 감소하였지만 무첨가 두부보다는 높았다. 알팔파 추출물의 첨가량이 증가할수록 pH는 감소하는 경향을 보였으나 유의적인 차이는 없었으며, 탁도는 증가하는 경향을 보였다. 두부의 색도는 알팔파 추출물을 첨가하였을 때 L값은 감소하고 a값과 b값은 증가하는 경향을 보였으며 a값은 모두 음(-)을 나타내어 녹색의 경향을 띄었다. 알팔파 추출물 첨가 두부의 견고성은 첨가량에 따라 증가하는 경향을 보였고 응집성, 탄력성, 검성 및 깨짐성은 첨가량에 따라 감소하는 경향을 보였다. 알팔파 추출물 첨가 두부의 이소플라본 함량은 첨가량에 비례하여 daidzein, genistein은 각각 322.6~348.6, $342.0\sim385.3{\mu}g/g$으로 증가하였다. 두부의 관능검사 결과 점수는 알팔파 추출물 첨가량이 증가할수록 감소하는 경향을 보였으나, 0.5% 첨가 두부가 대조군에 비해 다소 높은 점수를 받았다. 이상의 결과를 종합해 보면 알팔파 추출물의 첨가는 전체적인 조직감 및 이소플라본 함량 증가에 긍정적인 영향을 미치며, 두부의 품질 특성은 유지하면서 관능적 특성 및 기능성의 향상을 기대할 수 있다. 또한 알팔파 추출물을 0.5% 이내로 첨가하였을 때 두부의 조직감 및 기호도를 높일 수 있는 가장 적절한 농도로 판단된다.

Keywords

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