| 摘要 |
Disclosed is a soy protein composition, comprising; a mixture of 7S and 2S rich protein fraction having a beta-conglycinin content greater than about 45% by weight on a moisture free basis, and having an a content of from about 15% up to about 30% by weight on a moisture free basis, an alpha' content of from about 22% up to about 40% by weight on a moisture free basis and a beta content of from about 5% up to about 18% by weight on a moisture flee basis: a glycinin content of from about 13% up to about 45% by weight on a moisture free basis; wherein a weight ratio of beta-conglycinin to glycinin in the soy protein composition is from about 1 up to about 6; and wherein a TIU/mg content in the soy protein composition is from about 50 up to about 125 before denaturation and from about 5 up to about 30 after denaturation. Also disclosed is a process for preparing a mixture of 7S and 2S rich protein fraction having a beta-conglycinin content greater than about 45% by weight on a moisture free basis, and having an a content of from about 15% up to about 30% by weight on a moisture free basis, an alpha' content of from about 22% up to about 40% by weight on a moisture free basis and a beta content of from about 5% up to about 18% by weight on a moisture free basis; a glycinin content of from about 13% up to about 45% by weight on a moisture free basis; wherein a weight ratio of beta-conglycinin to glycinin in the soy protein composition is from about 1 up to about 6; and wherein a TIU/mg content in the soy protein composition is from about 50 up to about 125 before denaturation and from about 5 up to about 30 after denaturation, the process comprising: in a first precipitation, precipitating a soybean 11S-rich globulin fraction from a dispersion of soy protein in a liquid medium, thereby forming a first supernatant liquid medium, separating said soybean 11S-rich globulin fraction from said first supernatant liquid medium, in a second precipitation, precipitating a mixture of a soybean 11S-rich globulin fraction and a soybean 7S-rich globulin fraction from said first supernatant liquid medium, thereby forming a second supernatant liquid medium, and in a third precipitation, precipitating a mixture of 7S-rich globulin fraction and 2S-rich fraction from said second supernatant liquid.
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