According to a preliminary rapid visco
analyzer (RVA) experiment for monitoring the
heating profile of the cake batter (data not shown),
the viscosity of the batters increased after being
subjected to the pasting temperature due to the
starch gelatinization and protein denaturation
(Wilderjans et al., 2008). The cake batter viscosity
increased earlier in the samples containing higher
TS contents. Peak viscosity increased with
increasing TS content along with the earlier
increase in viscosity, leading to air bubbles created
during whipping being retained in the cake crumb.
Thus the changes of batter viscosity during baking
with different mixing ratios of WF and TS were
expected to modify the cake structure (data not
shown). However, the baked cakes prepared from
100% TS had a very low volume with a dense,
gummy layer at the bottom. Therefore, the
relationship between specific volume and batter
density as shown in Figure 3 could explain the
batters prepared from the WF and TS within the
studied mixing ratios.