The oil uptake and moisture loss of the donuts (Fig. 1) are partly
responsible for the fat and moisture content of the donuts. All soy
donuts had approximately two times lower oil uptake (8e11 g/
100 g) than the wheat control (26 g/100 g) (p < 0.05). The result of
our data concur with the study by Alpaslan and Hayta (2008) which
reported that the 20% soy flour substitution reduced oil absorption
by 23% in deep-fried wheat dough product. The reduced fat penetration
during deep-frying is probably due to heat denaturation of
the surface soy proteins forming a barrier that retards oil uptake