3. Results and discussion
3.1. Preliminary study: selection of experimental design
In order to select the appropriate range for the optimum reaction
conditions, preliminary experiments were conducted according
to the experimental design shown in Table 2. The
experimental points generated by Design Expert Software, their
coded levels, and the observed responses (RS and P contents), for
the CL corn and wheat starch samples produced in the preliminary
experiments, are shown in Table 2.
As can be observed from Table 2, the RS contents of CL wheat
starches were generally higher than those of the CL corn starches.
This was also revealed by the paired t-test analysis (p < 0.05). RS
contents were relatively low for the CL starch samples prepared