Films of PDLLA and ESOPLA were prepared by a solution casting method using a 3.0 wt% chloroform solution and they were placed in glass Petri dishes (47 mm) [12]. The solvent was allowed to evaporate over 48 h and films had formed. These films were dried in vacuum until a constant weight was obtained. All experiments were performed at room temperature. The obtained glabrous transparent films were cut into 10 10 mm pieces. The obtained films were UV sterilized for 30 min before the degradation study [13].