Both soymilk and tofu are popular food commodities
consumed in Asian countries and are being introduced
in North America. During processing of soymilk and
tofu, soybeans have to be soaked and then heated at
100 C for a certain period of time. In addition, coagulants such as
calcium sulfate have to be added to soymilk to coagulate to make tofu. However, it has been reported that the
variety and amount of coagulants used could affect the
yield and quality of tofu pronouncely. Since the conversion of
malonyl or acetyl glucosides to glucosides or aglycones
of isoflavones in soymilk and tofu is affected by various
soaking and heating treatments as well as coagulation
conditions have to be also explored. The objective of
this study was to determine the stability of isoflavone
glucosides during processing of soymilk and tofu.