Increasing barrel temperature increased resistant starch content
(Fig. 2E), which was in agreement with Escarpa et al. (1996), who
reported that resistant starch levels were increased due to moist
heat processes. The effect of screw speed on resistant starch was
also significant (Table 3). Resistant starch content increased as
screw speed was increased (Fig. 2F). Increasing screw speed led to
a temperature rise of the starch mass in the extruder barrel, resulting
in an increase in percentage of gelatinised starch (Fig. 2D).
Researchers suggested that retrogradation of gelatinised starch induces
the formation of resistant starch (Faraj, Vasanthan, & Hoover,