This paper explored the causes of protein precipitate formation in blanched soymilk prepared by blanching
soybeans through studying the changes in composition and amount of protein particles during its
thermal processing. Compared with the traditional method of preparing soymilk, blanching changed
the thermal aggregation behavior of protein particles. Results showed that when blanching was applied
to soybeans, b-conglycinin (7S) was denatured in the blanched soybeans, which resulted in the fixation
and aggregation of 7S prior to the grinding processing. Therefore, 7S lost its inhibitory ability on the
growth of other protein aggregation, explaining the increased insoluble precipitates in the blanched
soymilk