The replacement of wheat flour by soy flour and WPC affected
the development of Maillard reaction. The addition of WPC was
highly significant since it reduced lysine availability and increased
color development. The addition of soy flour had a significant effect
on color development but did not affect available lysine loss. Color
development was characterized by the increase of k/s coefficient,
dominant wavelength and excitation purity, while the luminance
decreased. These modifications indicate the production of chromophores
with a strong absorption in the region closely below
450 nm. Finally, the increment of water in the formulation
produced a significant delay in the development of Maillard reaction,
thus reducing color development and available lysine loss. The
effect of ingredients in the development of Maillard reaction in
cookies has to be considered when using composite-flours as it
modifies sensory and nutritional attributes of the final product