Patent ID: 7182972

Claim:
A water-soluble bean-based extract prepared by a method comprising: stirring a pulverized crude bean extract and a coagulant in heated water to form a suspension; and collecting a supernatant of the suspension to obtain a water-soluble bean-based extract; wherein the heated water has a temperature of 30–100° C.; and the water-soluble bean-based extract containing one or more isoflavone derivatives of the formula: in which R 1 is hydrogen or hydroxy, R 2 is hydrogen or methoxy, R 3 is hydrogen or CO-R 4 , R 4 being methyl or carboxymethyl; and the water-soluble bean-based extract, in dried form, includes from about 5 to about 50 parts by weight of isoflavone derivatives and has a solubility from 10 mg/ml to 1,000 mg/ml in water at about 25° C.