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FTR spectra of HM1 loaded with (A) caffeine and (B) diclofenac sodium by diffusion (HM1_D) and mixing (HM1_M) methods. Compression stress–strain curves of the HM1 membranes (light grey dashed line) and the HM1 membranes loaded with (A) caffeine and (B) diclofenac sodium by diffusion (full lines, orange for caffeine and blue for diclofenac sodium) and mixing (dotted lines, red for caffeine and green for diclofenac sodium) methods.
