This is probably because
calcium sulfate is a better protein coagulator than
calcium chloride. Several reports have indicated that
the coagulation process can cause a considerable loss
of isoflavones (Wang & Murphy, 1996). Jackson et al.
(2002) also reported that isoflavones may form complex
with protein in soybeans, which can be released together with whey during coagulation. Theoretically,
the higher the concentration of coagulant, the faster
the coagulation rate should be.