A method of treating a proteinaceous material having a first concentration
of .beta.-conglycinin, the method including combining the proteinaceous
material with an enzyme to form a reaction mixture, the reaction mixture
initially having a pH of at least about 7.0 standard pH units, allowing
the enzyme to hydrolyze .beta.-conglycinin present in the reaction
mixture to form a proteinaceous intermediate, and inactivating the enzyme
present in the reaction mixture after a reaction period to form a
proteinaceous product, the proteinaceous product having a second
concentration of .beta.-conglycinin, the second concentration of
.beta.-conglycinin being at least 99 percent less than the first
concentration of .beta.-conglycinin.