Five blends of sorghum (Sorghum bicolor) flour
(25.0–45.0 %) and whole wheat flour were used to make
biscuits using inulin (5.0–10.0 %) and guar gum (1.0–
2.0 %). An experimental investigation was carried out with
the aim of evaluating the effect of fat replacer (inulin) and
sorghum flour on the quality of high fibre and low calorie
biscuits. For this purpose, the biscuit dough and the biscuit
samples were analyzed. The analysis was based on hardness
of the dough, hardness of the biscuit, fracturability and
overall acceptability (OAA) scores. Results showed that
increasing the amount of sorghum flour in biscuit increased
the dough hardness and biscuit hardness, whereas, biscuit
fracturability decreased and OAA scores increased up to the
level at which sorghum flour ranged from 35.0 to 40.0 %
after which it decreased. An increase in the amount of inulin
was followed by an increase in biscuit hardness, while,
fracturability and OAA scores decreased and there was little
effect on the dough hardness. Optimum conditions generated
from the analysis was 40.8 % sorghum flour, 6.5 % inulin
and 1.0 % guar gum. The predicted response in terms of
dough hardness, fracturability, biscuit hardness and OAA
were 212.4 g, 36.4 mm, 4.8 kg and 7.06, respectively. The
desirability of the optimum condition was 0.827.