After baking, the foamed product should be taken out of the
mold with ease to preserve its shape. For this reason, magnesium
stearate is typically added to the batter as a mold release agent.
Guar gum is also added to prevent settling of the starch [14]. The
baked foams normally have the dense outer skin layer with small
and closed cell structure; while the interior shows loose, large,
and opened cell structure (see Fig. 2b). The density of this baked
foam was shown to be affected by the type of starch used. Glenn
et al. reported that baked foam panels made of wheat and corn
starches had higher density (0.15 g/cm3
) than those made of
potato and tapioca (0.12 g/cm3
) [23]. Shey et al. also presented
that baked starch foams based on wheat, potato, and waxy corn
starches had the different densities of 0.20 g/cm3
, 0.15 g/cm3
, and
0.13 g/cm3
, respectively. In this work, the waxy corn starch showed
a better foaming property than the other native starches, yielding a
product that had the lowest density