THESIS

117
molecular weight ( DP n ∼ 30), and a low molecular weight fraction ( DP n ∼ 5) was
found for the resistant starch type III.
Starch digestibility (% dwb)
100
90
80
70
60
50
40
30
20
10
0
0 8 10 12 14 16
Pullulanase concentration (unit/g starch)
Resistant starch Digested starch Total starch
Figure 28 Effect of pullulanase enzyme concentration
(0 to 16 unit/g starch for 16h)
on starch digestibility
(% dwb) of RS III formation from HARS
1.3.5 Physiochemical properties
The effects of enzyme concentration (0 to 16 unit/g starch for
16hr) on the physiochemical properties of debrached rice starch paste preheated at
121°C for 30 min showed in Table 17. Production yield (%) is the total weight of the
dry RS III fractions divided by the original weight of the rice starch sample. The
production yield, moisture content, and water activity in RS III formation by
debraching process with different enzyme concentrations were 84.61 to 86.16%. The
slight decreasing in production yield for the lower enzyme concentration
(8 to 10
unit/g starch) might
be due to some losses of starch fraction during freeze-thawed
process and vacuum filtrated. However, no significant differences (P