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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Physicochemical Characteristics of the Tofu (Soybean Curd) Added Sorghum (Sorghum bicolor L. Moench) Powder

수수가루 첨가에 따른 두부의 이화학적 특성

  • Woo, Koan-Sik (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Ko, Jee-Yeon (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Seo, Myung-Chul (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Song, Seuk-Bo (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Oh, Byeong-Geun (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Jae-Saeng (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Kang, Jong-Rae (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Nam, Min-Hee (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration)
  • 우관식 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 고지연 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 서명철 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 송석보 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 오병근 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 이재생 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 강종래 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 남민희 (농촌진흥청 국립식량과학원 기능성작물부)
  • Published : 2009.12.31
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Abstract

This study was carried out to compare the physicochemical characteristics of the tofu (soybean curd) with the additions of sorghum powder (SP). With increasing amounts of sorghum powder, the yields of tofu were increased. The tofu made of 5 and 7% (w/w) addition rates of SP gave the similar yields with that of control. Moisture contents of the tofu made of roasted sorghum powder after steeping for 15 hours (WR-SP) were higher than those of the control and the tofu made of roasted sorghum powder after washing (SR-SP) without steeping. The dietary fiber contents of tofu were higher in the SP-added tofu than control. The potassium contents increased with SP addition rates, while calcium and magnesium decreased. With increasing SP addition rates, hardness of the tofu decreased. With increasing amounts of SP, the L- and b-values of tofu decreased, whereas a-value increased. The total polyphenol, flavonoid and tannin contents, and ascorbic acid equivalent antioxidant capacity in the tofu extracts increased with increasing SP rates. Antioxidant components and activity were the highest in the tofu made of roasted sorghum powder after washing without steeping with the addition rates of 3-10%.

기능성 강화 두부의 제조와 수수의 이용성을 높이기 위해 수수가루를 첨가한 두부를 제조하여 이화학적 특성을 검토하였다. 수수가루 첨가 비율에 따라 제조된 두부의 수율은 약간 증가하는 경향을 보였으며, 5 및 7%(w/w) 첨가한 두부에서 무첨가 두부와 비슷한 수율을 보였다. 제조된 두부의 수분함량은 불린 후 볶은 수수가루를 첨가하였을 때 높은 수분함량을 보였고 단백질 및 회분 함량은 큰 차이가 없는 것으로 나타났다. 식이섬유 함량은 무첨가 두부보다 수수가루를 첨가한 두부가 높은 함량을 보였다. 칼륨의 함량은 증가하는 것으로 나타났으며, 칼슘 및 마그네슘 함량은 대체적으로 수수가루 첨가에 따라 감소하는 경향을 보였다. 경도는 수수가루 첨가량이 증가함에 따라 경도는 뚜렷하게 감소하는 경향을 보였다. 대체적으로 수수가루 첨가량에 따라 L 및 b값은 감소하는 경향을 보였으며, a값은 증가하는 경향을 보였다. 무첨가 두부의 총 폴리페놀, 플라보노이드 및 탄닌 함량은 0.955, 0.072 및 0.328 mg/g(dry basis)으로 나타났으며, 총 항산화력은 0.770 mg AA eq/g sample(dry basis)으로 나타났다. 수수가루 첨가량에 따라 총 폴리페놀, 플라보노이드 및 탄닌 함량과 총 항산화력은 증가하는 경향을 보였으며, 불리지 않고 볶은 수수가루를 첨가한 두부 추출물이 불린 후 볶은 수수가루를 첨가한 두부 추출물보다 높은 경향을 보였다. 두부의 수분함량, 경도, 항산화활성 등을 고려할 때 5-7%의 불리지 않고 불리지 않고 볶은 수수가루를 두부 제조 시 첨가하는 것이 바람직한 것으로 생각되었다.

Keywords

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