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Differential scanning calorimetry (DSC) thermograms of Film 1 (bottom line) contained doxycycline in chitosan, gelatin, povidone, glycerin and Eudragit® RS 12.5: Film 2 (middle line) contained doxycycline, β-cyclodextrin and HPMC microparticles in chitosan, gelatin, povidone, glycerin and Eudragit® RS 12.5; and Film 3 (top line) was the same as in Film 2, but the manufacturing of microparticles was performed using sodium thiosulfate, MgCl2 in 2% HPMC with Eudragit® RS 12.5.
