The dough made with the glycinin and β-conglycinin solutions rose just as well as the dough made with soymilk (Fig. 6). The ratio of volume increase after yeast fermentation, viscosity and CO2 emissions were all measured as described above, with no significant difference in the results between both protein solutions (Table 1). These results clearly show that soy globulin is one of the reasons why the volume of yeast-fermented dough made with soymilk is greater than that made with water. The two types of dough made with the glycinin and β-conglycinin solutions were then baked into bread (Fig. 7). Bread made with dough of both protein solutions rose better than dough made with 55 g of water (Fig. 5, (A)). There was, however, a noticeable difference between the specific loaf volume ( p < 0.05) and gas cells of the different proteins, with a higher proportion of smaller gas cells in the bread made with glycinin dough. The comparative sizes of gas cells in the different breads were then determined using image analysis.