Polyelectrolyte vs Polyampholyte Behavior of Composite Chitosan/Gelatin Films.

While the effect of the variation in the ionic strength of salt solutions is shown in Figure S3 , Supporting Information, we note that for the three salt solutions at the ionic strength of 0.6 M (for 0.6 M NaCl, 0.2 M Na 2 SO 4 , and 0.2 M CaCl 2 solutions), the variation of Q showed a trend that was similar to film dissolution ( Figure 1 a): film exposure to the solutions containing Cl – anions resulted in similar Q values (332 vs 386% for NaCl and CaCl 2 solutions, respectively), while exposure to Na 2 SO 4 solution showed a significantly lower Q value of 164%.

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