To further understand the rice starch hydrolysis during
enzymatic extrusion, the molecular distribution was
determined by HPLC (Fig. 2). In the profile of sample a,
the peak of amylopectin, main starch of glutinous rice,
appeared at about 10 min and there was still a small peak at
about 21 min representing a few oligosaccharides in the
extrudate without amylase addition. Then the amylopectin
was beginning to degrade in sample b, and there were
signals from 10 to 21 min, reflecting that amylopectin was
degraded into dextrin with a variety of different molecular
sizes. Finally, the peak of amylopectin disappeared in
sample c, it was mainly degraded into oligosaccharides
especially maltose.