Optimization criterion was based on the highest level of sensory
scores including acceptance. To obtain the optimum region, an
overlay plot was provided using the low and high scores of sensory
responses. The optimum region (contour's left side in Fig. 3) was
obtained from the software (Design-Expert) calculation. It consists
of a mixture containing 96 g/100 g corn grits, 3 g/100 g shrimp
powder and 1 g/100 g sugar. Therefore, the formulated product
containing optimized mixtures was developed and confirmed by
the experts. The corn-shrimp snacks and regular corn snacks as
control sample were stored at ambient temperature (27 ± 2 C) to
study quality changes.