Aqueous purified soy protein and beverage
First Claim
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1. The process for preparing an aqueous purified soy protein solution which comprisesa. preparing an aqueous extract of particulate defatted soybean with water or at neutral or alkaline pH containing about 2.5 to 20% by weight of solids;
- b. adding sufficient of a water soluble base to said extract to adjust the pH thereof within the range of pH 10.1-14;
c. separating insoluble material from said extract to yield a clarified extract containing about 1 to 12% by weight of protein, about 1 to 10% by weight of carbohydrate, about 0.3 to 3% by weight of mineral constituents reported as ash, and about 0 to 1% by weight of fat;
d. neutralizing said clarified extract to a pH in the range of from 6 to 10;
e. separating carbohydrate and mineral constituents from said clarified extract by ultrafiltration employing a semi-permeable membrane which has the capability to retain proteins to provide said aqueous soy protein solution as retentate containing from 1 to 12% by weight of protein, a protein coefficient of at least 0.8, and up to about 0.1% by weight of fat.
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Abstract
Soy protein having greatly reduced phytic acid and phytate complexes is prepared by aqueous extraction of defatted soy flakes, basification to a pH in excess of 10.1, and removal of insolubles. The clarified extract may be reduced in mineral and carbohydrates content by ultrafiltration. The purified aqueous extract may be advantageously used directly in the preparation of liquid dietary products without drying.
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28 Claims
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1. The process for preparing an aqueous purified soy protein solution which comprises
a. preparing an aqueous extract of particulate defatted soybean with water or at neutral or alkaline pH containing about 2.5 to 20% by weight of solids; -
b. adding sufficient of a water soluble base to said extract to adjust the pH thereof within the range of pH 10.1-14; c. separating insoluble material from said extract to yield a clarified extract containing about 1 to 12% by weight of protein, about 1 to 10% by weight of carbohydrate, about 0.3 to 3% by weight of mineral constituents reported as ash, and about 0 to 1% by weight of fat; d. neutralizing said clarified extract to a pH in the range of from 6 to 10; e. separating carbohydrate and mineral constituents from said clarified extract by ultrafiltration employing a semi-permeable membrane which has the capability to retain proteins to provide said aqueous soy protein solution as retentate containing from 1 to 12% by weight of protein, a protein coefficient of at least 0.8, and up to about 0.1% by weight of fat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification