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US 5,472,511 AGranted
Method for the separation of proteins from grain flour
AssigneeBoard of Trustees operating Michigan State University
InventorsLuis M. Rayas, Perry K. W. Ng
Life of this patent
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Abstract
A process wherein a grain flour is treated to remove proteins is described. The process uses ethanol and water for the extraction at acid or basic pH's and optionally heating with or without a reducing agent. The remaining solution is then used to form edible and biodegradable films by casting on a surface.
Claims33
A process for separation of proteins in a grain flour which consists essentially of the steps of:
- (a) mixing the flour containing essentially of the proteins and starch with water containing between about 50 and 95% ethanol, based on the total amount of water and ethanol, as a solution at a pH which causes the proteins to be solubilized in the solution selected from the group consisting of about pH 3 to 6 in the presence of an acid selected from the group consisting of acetic, lactic, and sulphuric acids, and so that the starch is essentially insoluble in the solution;
- and
- (b) centrifuging the solution to separate the starch from the solution;
- (c) removing the solution from the starch;
- and
- (d) optionally heating the solution at a temperature between about 30.degree. C. and a boiling point of the solution to concentrate the solution, wherein the proteins can be formed into a film from the solution.
3 more elements
A process for separation of proteins in a grain flour which comprises:
- (a) mixing the flour containing the proteins and starch with water containing between about 50 and 95% ethanol as a solution at a pH which causes the proteins to be solubilized in the solution and so that the starch is essentially insoluble in the solution;
- and
- (b) centrifuging the solution to separate the starch from the solution;
- (c) removing the proteins containing solution from the starch;
- (d) heating the solution at a temperature between about 30.degree. C. and a boiling point of the solution to remove ethanol and some of the water to form a remaining solution;
- (e) adding a plasticizer to the remaining solution;
- and
- (f) forming a film by removal of water from the remaining solution.
5 more elements
The process of claim 29 wherein the centrifuging is at between about 1,000 and 30,000 times gravity.
Dependencies are inferred from the claim text.