Six formulas of corn-based snack were formulated with various ratios of corngrit : calcium
carbonate (CaCO3) : soybean oil. Extrusion processes were conducted by feeding each formula into an
extruder at 444 g/min feed rate, employing 300 rpm. Moisture content of the raw materials were adjusted
to 16.0±0.5%, with melt temperature of 156–158°C. The product samples exhibiting best physical
properties composed of 93 % corn grit, 1 % CaCO3 2 % soybean oil, 3 % sugar and 1 % vitamins and
minerals mixtures, which was coded as C6 and exhibited an expansion ratio (E.R.) of 3.90, bulk density
(B.D) 70 g/L and compression force (C.F) 69.2 N. However, C6 corngrit based snack samples possessed
the characteristics of overexpanded, crisp friable mouthfeel, orange – yellowish in color and lack of corn
odor. Therefore, further developing of C6, subsequently renamed as CR′
0 was undertaken by substituting
10 – 80 % of corn grit with broken rice, resulted in 17 formulas. The corngrit-broken rice snacks were
examined for physical properties and then coated with chicken flavor prior to subject to sensory evaluation.
Extruded samples produced from 50% of broken rice substitution (CR′
5) was detected to decrease E.R
value (3.70) and increase B.D (76.60 g/L) and C.F (96.5 N.) compared to those samples of CR′
0. Among
17 formulas, CR′
5 gained the highest scores in flavor and texture preference with the overall acceptability
of 7.05, 7.05 and 7.15 (9–point hedonic scale) respectively, which were significantly