Sodium bicarbonate
increased the L * value of the extrudates from 52.65 ± 0.50 to 58.15 ±
0.28, decreased the a * and b* values from 8.51 ± 0.05 to 6.98 ± 0.16
and 1.91 ± 0.02 to 0.81 ± 0.09, respectively. Colour retention also
decreased b y almost 50% from 41.77 ± 0 .66% to 20.66 ± 0 .28%
( Table 4).