Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Quality Characteristics and Antioxidant Effects of Peanut Sprout Soybean Yogurt

땅콩나물 분말 첨가가 대두요구르트의 품질 및 항산화능에 미치는 영향

  • Kim, Jae-Yong (Jeonnam Institute of Natural Resources Research) ;
  • Kwon, Soon-Jae (School of Food Science and Biotechnology, Kyungpook National University) ;
  • Kang, Hye-In (Department of Food and Nutrition, Sunchon National University) ;
  • Lee, Ju-Hye (Department of Food and Nutrition, Sunchon National University) ;
  • Kang, Jum-Soon (Department of Hortcultural Bioscience, Pusan National University) ;
  • Seo, Kwon-Il (Department of Food and Nutrition, Sunchon National University)
  • Received : 2012.11.13
  • Accepted : 2013.02.12
  • Published : 2013.04.30
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Abstract

To evaluate peanut sprouts as a functional food material, the quality characteristics and antioxidant activities of soybean yoghurt with different percentages (0.5, 1.0, 2.0, and 3.0%) of peanut sprout powder (PSP) contents were investigated. The pH of soybean yogurt with PSP decreased in a time- and dose-dependent manner during fermentation, whereas the titratable acidity increased under the same conditions. The Hunter L value (lightness) decreased while the b value (yellowness) and a value (redness) increased as the PSP concentration in soybean yogurt increased. Prior to fermentation, the sugar content of the soybean yogurt increased as the PSP level increased, but the contents decreased as fermentation progressed. Meanwhile, the viscosity of the soybean yogurt increased during fermentation, and the lactic acid bacteria population was higher than that of the control. The sensory properties, including the flavor, color, taste, and overall acceptability, of the soybean yogurt containing 0.5 and 1% PSP, respectively, were higher than those of other tested yoghurts (with 0, 2.0, and 3.0% PSP contents). The antioxidant activity of the soybean yogurt significantly increased at the PSP concentrations of over 1.0%. These results suggest that the addition of PSP has beneficial effects on the quality and functionality of soybean yogurt, and that the addition of 1.0% PSP is the most suitable for manufacturing soybean yogurt.

본 연구에서는 땅콩나물 분말을 다양한 농도(0, 0.5, 1.0, 2.0, 3.0%)로 첨가한 요구르트의 품질 특성 및 항산화활성 측정을 실시하였다. 요구르트의 발효 중 pH는 발효시간 및 땅콩나물 분말 첨가량에 의존하여 감소한 반면, 적정산도는 발효시간 및 땅콩나물 분말 첨가량이 증가할수록 산도가 증가하였고 요구르트의 명도는 감소하였으며, 황색도 및 적색도는 증가하는 경향을 나타내었다. 땅콩나물 요구르트의 당도는 땅콩나물 분말 첨가량에 의존하여 증가하였으며, 발효가 진행됨에 따라 감소하였다. 한편, 요구르트의 점도는 발효시간과 땅콩나물 분말 첨가 농도가 증가할수록 높아졌으며, 첨가군의 유산균수는 대조군에 비하여 높게 측정되었다. 땅콩나물 요구르트의 관능평가에서는 질감에 대한 선호도를 제외하고 향미, 색, 맛 및 전반적인 기호도에서 0.5 및 1.0% 땅콩나물 분말 첨가군에서 다른 첨가군보다 높은 선호도를 나타내었다. 요구르트의 항산화활성은 1.0% 이상 땅콩나물 분말 첨가하였을 때 유의적으로 항산화활성이 증가하였다. 이상의 결과를 통해 요구르트를 제조 시 땅콩나물 분말의 첨가는 산 및 유산균과 같은 품질특성을 증가시키고, 항산화 효과와 같은 기능성을 증가시키는 것으로 확인되었다. 특히, 1.0% 농도의 땅콩나물 첨가는 땅콩나물 대두 요구르트 제품 개발시 기능성 및 기호도 향상에 가장 적합한 조건으로 이용될 수 있으리라 생각된다.

Keywords

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