The surface of native starch granules was smooth and no evidence of fissure was observed under the SEM. Cavities appeared on the samples of HMT-15, HMT-30 and HMT-35 (Fig. 1B, E, and F), and pitting and indentation occurred on the samples of HMT-20, HMT-25, HMT-30, and HMT-35 (Fig. 1CeF). These observations could be attributed to the re-association of the starch chains within the granule where the tissue structure