Abstract: This invention concerns a process for preparing soluble rice protein concentrate with reduced levels of manganese, aluminum, selenium and phytic acid and improved digestibility from rice raw material comprising:digesting the raw material reduced in particle size to permit efficient enzyme action in an aqueous medium with an alpha-amylase enzyme at an operable pH and temperature for a period of time sufficient to solubilize a substantial portion of the rice starch and form a liquid slurry;heating the rice starch slurry at 105.degree. C. to 130.degree. C. for 30 to 60 seconds;separating the high protein rice flour from the rice syrup;treating a slurry of the high protein rice flour with a protease enzyme at an operable pH and temperature in an amount and for a period of time to solubilize the rice protein:clarifying the protease treated slurry to provide a soluble rice protein concentrate with reduced manganese, aluminum, selenium and phytic acid and improved digestibility.

Abstract: A method for preparing high protein rice flour (HPRF) containing low manganese is disclosed wherein essential steps comprise:blending rice flour and water at a pH of 3.4 to 4.6;separating the insoluble washed rice flour;resuspending the washed rice flour and adjusting the suspension to a pH and temperature within the operable range of an alpha-amylase enzyme;treating the suspension with an alpha-amylase enzyme for a sufficient time to hydrolyze the starch to 5 to 50 DE content;adjusting the treated mixture to a pH of 3.4 to 4.6; and theseparating rice syrup from low manganese high protein rice flour.The high protein rice flour contains more than 16% protein, has a manganese content of 50 micrograms or less per gram of protein and is further treated with a proteolytic enzyme to provide a modified low manganese HPRF suitable for use in powdered infant formula.

Abstract: A high quality soy protein isolate with significantly reduced aluminum content and substantially free of phytic acid and phytate complexes is prepared by aqueous extraction of defatted particulated soybeans at pH 8 to 10, and at a temperature above 65.degree. C., separating the extract and then precipitating the protein out of solution, at a pH slightly higher than its isoelectric point, i.e., pH 5.3.

Abstract: Superior soy protein beverages are prepared by formulation of carbohydrate, fat, or other nutritional ingredients with the liquid retentate of a soy protein ultrafiltration purification process without first recovering the soy protein by precipitation or drying of the retentate. Short-time high-temperature heat treatment of soy protein solution purified by ultrafiltration improves functional and nutritional qualities thereof.

Abstract: An oilseed lipid-protein product adapted for food use is prepared by aqueous extraction of fat containing oilseed materials including the ground raw oilseed or full-fat oilseed flour or flake at a pH in excess of the isoelectric range of the protein for the purpose of solubilizing the protein. Insoluble material is removed by centrifugation or filtration, and soluble carbohydrate is removed from the resulting lipid-protein emulsion by membrane filtration.

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.

Abstract: A process is described by means of which whole soybeans are converted into a milk-like product which is bland in flavor, has functionality characteristics similar to cow's milk, and which has a substantially reduced proportion of soybean carbohydrate. The process involves a combination of blanching, wet grinding, homogenizing, centrifuging, and heat treating steps.

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.