Specific gravity (SG) provides an indication of the total air holding capacity of the batter. Low SG values indicate good incorporation of air, yielding a higher final volume after baking;
however, many other factors also affect this quality parameter (Frye & Setser, 1991).
The SG values of the different muffin batters are shown in Table 2.
A significant decrease in SG was found with sucrose replacement by the PD-SC mixture, indicating higher incorporation of air into the batter as sucrose was replaced.
SG has also been found to decrease in sponge cakes on replacing sucrose with wheat starch, sorbitol and aspartame (Baeva et al., 2003).