Production of isoflavone enriched fractions from soy protein extracts
AssigneeArcher Daniels Midland Company
InventorsEric T. Gugger, Daniel G. Dueppen
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Abstract
The temperature sensitive differential of the solubilities of isoflavones is used to separate them by heating an aqueous soy molasses feed stream. The temperature of the feed stream is increased to select isoflavone fractions. Then the heated feed stream is passed through an ultrafiltration membrane. The resulting permeate is cooled to crystallize the isoflavone fractions. Or, the permeate may be put through a resin adsorption process in a liquid-chromatography column to separate out the desired isoflavone fractions. Various processes are described for drying and recrystallizing the resulting isoflavone solids.
Claims21
A process for separating isoflavones fractions from an aqueous vegetable starting material, said process comprising the steps of:
- (a) heating an aqueous vegetable starting material to a constant temperature selected on a basis of an aqueous solubility for a given isoflavone fractions that is to be recovered;
- (b) passing the heated starting material of step (a) through an ultrafiltration membrane to obtain a permeate, the membrane having a cut-off which passes the given isoflavone fractions;
- (c) adjusting back pressure in a retentate acting on the membrane of step (b) to adjust a flow of said permeate while continuing said ultrafiltration;
- and
- (d) collecting said isoflavones fractions from the permeate.
A process for separating isoflavone fraction from an aqueous vegetable starting material, said process comprising the steps of:
- ultrafiltrating a heated feed stream of soy molasses starting material to isolate isoflavone fractions in an ultrafiltration permeate;
- recovering the isoflavone fractions by adsorption of the permeate on a resin;
- washing said resin with water in order to remove residual impurities from the adsorbed isoflavone fractions;
- and
- eluting the washed isoflavone fractions with aqueous alcohol.
Dependencies are inferred from the claim text.