The water absorption of TPS increased after increasing the storage time from 7 days to 45 days, from 23.81% to 31.00%, respectively (Fig. 3). As the amount of the cross-linked starch increased there was a significant loss of ability to absorb water. The lowest ability to absorb water was obtained when the amount of the cross-linked starch was 20 wt%, when the water absorption was 9.31% and 14.34% after storage for 7 days and 45 days, respectively. That cross-linked starch can decrease the water absorption of TPS is because of the lower hydrophilicity of the cross-linked starch