Influence of Phytase Treatment on the Gelation Property of Soymilk

Abstract

The contribution of phytate to the gelation properties of soymilk was studied by a phytase treatment to reduce the phytate in soymilk. The breaking stress of the gel prepared from the phytase-treated soymilk was higher than that from the untreated soymilk when glucono-δ-lactone (GDL) was used as a coagulant. As the phytate content of the soy protein isolate was decreased, so the breaking stress of the GDL-gel was increased as in the case of soymilk. This result indicates that the phytate in soy protein affects its coagulative reaction and hardness of the GDL-gel. An increase in viscosity and change in the zeta potential of soymilk resulted from the decomposition of phytate.