Back to results
US 4,072,670 AGranted
Low phytate isoelectric precipitated soy protein isolate
AssigneeMead Johnson & Company
InventorsKenneth C. Goodnight, Jr., Grant H. Hartman, Jr., Robert F. Marquardt
Life of this patent
Estimating the term…
Abstract
Soy protein isolate having a greatly reduced content of phytic acid and phytate complexes and high nutritional quality is prepared by aqueous extraction of defatted soy flakes at a pH in excess of the isoelectric value of the protein, basification of the extract to a pH in excess of pH 10.5, and removal of insolubles. The soy protein is then precipitated from the clarified extract by acidification within the isoelectric range.
Claims24
The process for preparing a soy protein isolate having low phytate content which comprises in sequence the steps of:
- (a) forming an aqueous solution of soy protein having a pH within the range of pH 10.6 to pH 14 at a temperature in the range of 10.degree.-50.degree. C. during a period sufficient to render phytates and phytic acid insoluble but insufficient to degrade said soy protein, said soy protein being obtained by aqueous extraction at a pH in excess of the isoelectric value of the soy protein of defatted particulate soybean which has not previously been treated with acid;
- (b) separating insoluble material including phytates and phytic acid from said solution to yield a clarified extract containing dissolved protein and dissolved carbohydrate;
- (c) acidifying acid clarified extract to a pH within the isoelectric range of from about pH 4 to about pH 5 thereby precipitating soy protein;
- and
- (d) separating said precipitated soy protein from said clarified extract.
2 more elements
Dependencies are inferred from the claim text.