processing, demonstrating the
extrusion process completely destructurized the native cornstarch
granules. These observations are consistent with the results of X-
ray diffraction. The same behavior was observed to thermoplastic
chitosan (Fig. 3B). However, there are small surface cracks, which
may have been formed during the compression-molding step after
the extruded films were formed as a consequence of the brittle
nature of chitosan.