The color of the control cake was light
yellow while the color of corn silk fiber added
cake, both of crust and crumb, was clearly different
from the control (Table 2). The color of FDF and
DDF-added cakes became darker. Many researchfound that crust color can be affected from the
Maillard reaction. Adding fiber did not seem to
have an effect on the reaction between the sugars
and amino acids, even though the lower proportion
of flour was used in the formulation. Color changes
could also happen by the alteration of pH from
the ability of dietary fiber to act as a buffer and
a change in water availability. However, no clear
evidence has been elucidated about the different
kinds of fiber to use to make the reaction happen
[39]. On the other hand, crumb color commonly
depends on the color of raw materials because the
increase in temperature inside the cake is not high
enough for the Maillard reaction and caramelization
to occur [39]. Hence, in this study a darker crust
and crumb color might come from the appearance
of fiber itself in the product. Considering the water
activity of the cake, addition of both FDF and DDF
did not significantly alter this property compared
to the control. Therefore, it could be assumed that
the fiber-supplemented cakes would have the same
storage ability and shelf-life as the control cake.