The height/diameter and specific volume for steamed bread are
given in Fig. 3A and B. Steamed breads made from bran
recombining processes had slightly lower height/diameter and
specific volume than that of wheat flour except for those prepared
using CWRS, whose values were higher than that of the control.
This is probably due to the adverse effects of bran present in wheat
flour. It was found that bran can weaken gluten network by fiberprotein
interactions and dilution of gluten (Gan et al., 1992; Noort,
van Haaster, Hemery, Schols, & Hamer, 2010). The dilution effects
might be due to the fact that bran is mainly consisted of water
soluble albumin and globulin proteins other than gliadin and glutelin
(Idris et al., 2003). Moreover, steamed breads made from bran
recombining processes had obvious larger height/diameter and
specific volume than those made from entire grain grinding processes,
while the differences among different bran recombining
processes were relatively small. This might be attributed to the
lower particle size of whole wheat flour for whole grain grinding