results and discussion
total solid and protein contents
the total solid content was significantly increased with higher level of sodium caseinate and/or WPI concentration ( P>0.05)(FIG 1). without supplementation of milk proteins, gel structure in the yogurt was not observed. similar result were reported by others. remeuf et al. noted that yogurt making required fortification of 4-5% protien to obtain enough solid content. lee et al. reported that soy milk formed a good gel at 8.12% protein contents, while et al. found that supplemented with calcium required only 5.4% protein to form a gel.