Functional Properties of Soy Protein Isolate from Heat Treated Soybean

열처리 대두에서 분리한 대두 단백질의 기능성

  • Yoon, Hye-Hyun (Department of Culinary Science and Arts, Kyung Hee University) ;
  • Jeon, Eun-Jae (Department of Food & Nutrition, Hannam University)
  • 윤혜현 (경희대학교 조리과학과) ;
  • 전은재 (한남대학교 식품영양학과)
  • Published : 2004.02.28

Abstract

Effects of heat treatment on functional properties of soy protein were examined. Soy protein isolate (SPI) was prepared from Korean soybean varieties, Manli and Taekwang, subjected to heat treatment at $60^{\circ}C$ for 30, 60, 90, and 120 min. pH-solubility results of SPI showed typical U-shape profiles with minimum solubility at pH 4-5 of isoelectric points of soy proteins, longer heat treatments showing slightly higher solubility. Water absorption, emulsifying activity, emulsion stability, and emulsion capacity of SPI increased, while oil absorption decreased, with heating time in Manli variety. Manli and Taekwang showed the highest emulsion capacities after 90-and 60-min heat treatments, respectively. Foam expansion of all SPIs increased with heating time up to 90 min. Texture profile analysis showed heat treatment up to 90 min significantly increased hardness, adhesiveness, springiness, gumminess, and chewiness, whereas significantly decreased cohesiveness of SPI gels (p<0.05).

Keywords

soy protein;heat treatment;functional properties;SPI;soy gel

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