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. 2021 Apr 28;7(2):51. doi: 10.3390/gels7020051

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Fourier-transform infrared spectroscopy (FTIR) analysis of: pure doxycycline hyclate and in films at time zero (a) (top figure) and after 26-week storage at 4 °C and 25 °C (b) (bottom figure); Film 1 = contained doxycycline in chitosan, gelatin, povidone, glycerin and Eudragit^® RS 12.5; Film 2 = contained doxycycline, β-cyclodextrin and HPMC microparticles in chitosan, gelatin, povidone, glycerin and Eudragit^® RS 12.5; and Film 3 = same as in Film 2, but the manufacturing of microparticles was performed using sodium thiosulfate, MgCl₂ in 2% HPMC with Eudragit^® RS 12.5.