The influence of processing variables on colour (L⁄, a⁄ and b⁄) of
pea starch noodles prepared by high temperature extrusion was
determined (Table 3). None of the variables (moisture content, barrel
temperature and screw speed) displayed a significant effect on
the L⁄ values (brightness) of the pea starch noodles (Table 3). The a⁄
values (greenness) of the pea starch noodles decreased as screw
speed increased (Fig. 1A and B), but moisture content and barrel
temperature had no significant effect on a⁄ (Table 3). The b⁄ values
(yellowness) increased as moisture content or screw speed
increased (Fig. 1C and D). Barrel temperature had little effect on
yellowness (Table 3).