Solubility of BSG films in water was measured following the
method of Jouki, Yazdi, Mortazavi, and Koocheki (2013). Film samples were dried at 95◦C for 24 h in a laboratory oven and then weighed to determine initial solid content. Pre-weighed film samples (1 cm × 3 cm) were immersed under constant agitation in 50 ml of distilled water for 6 h at 25◦C. After that period, the remaining pieces of films were filtered and dried at 110◦C to constant weight (final dry weight). The solubility was reported as the
difference between the initial and final dry matter with respect to
the initial dry matter