Korean Journal of Food Science and Technology (한국식품과학회지)
- Volume 26 Issue 5
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- Pages.603-608
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- 1994
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- 0367-6293(pISSN)
Effect of Cooking and Processing on the Phytate Content and Protein Digestibility of Soybean
대두의 조리 가공에 따른 Phytate 함량 및 단백질 소화율
- Kim, Hee-Seung (Department of Food and Nutrition, Ewha Woman's University) ;
- Yoon, Jae-Young (Department of Foods and Nutrition, Insan Junior College) ;
- Lee, Su-Rae (Department of Food and Nutrition, Ewha Woman's University)
- Published : 1994.10.01
Abstract
This study was undertaken to find out the effect of phytate on the protein digestibility of various soybean foods, including soy milk, bean curd, curd residue, cheongkukjang, soy sauce, and soy paste. The phytate content of soybean was 2.4%, which decreased to 0.2%, 0.7%, and 0.4% in soy milk, bean curd, and curd residue, respectively, and to 0.2% and 1.0% in soy sauce and soy paste, respectively. The phytate/protein ratio was not correlated with protein digestibility by pepsin whereas the ratio was highly correlated with pancreatin digestibility (p<0.01, r= -0.73). According to SDS-PAGE for the soluble protein fractions, soaked bean showed an alteration in soluble components and bean curd residue exihibited newer low molecular weight bands. Fermented soy products showed no protein band, likely due to degradation.
대두식품의 가공 및 발효에 따른 phytate 함량의 변화, 그 함량이 pepsin과 pancreatin에 의한 단백질 소화에 미치는 영향, 그리고 전기영동법에 의한 단백질 분획의 변화를 조사하였다. 황색콩의 phytate 함량은 2.4%이었고 가공 및 발효에 따라 감소하여 두유 0.2%, 두부 0.7%, 비지 0.4%로, 청국장 0.9%, 메주 1.4%, 간장 0.2%, 된장 1.0%로 나타났다. Phytate/protein 비율은 pepsin에 의한 단백질 소화율과 상관성이 없었으나 pancreatin에 의한 단백질 소화율과는 부(負)의 상관관계를 나타냈다(p<0.01, r= -0.73). 전기영동 결과 콩을 물에 불리면 수용성 분획이 변화되었고 두유 제조시 비지에는 주로 저분자량 밴드들이 새로이 나타났다. 발효 과정에서는 단백질이 분해되어 밴드가 거의 나타나지 않았다.