Characterization of Ketoprofen/Methyl-β-Cyclodextrin Complexes Prepared Using Supercritical Carbon Dioxide

Figure 5

FTIR spectra curves in the C=O stretching region of pure KP, KP : MeβCD physical mixtures and samples treated in scCO₂ at 40°C, 20 MPa, 1 h: (a) pure KP, (b) physical mixture A (16.3% KP), (c) treated sample A (16.3% KP), (d) physical mixture B (18.7% KP), (e) treated sample B (18.7% KP), (f) physical mixture C (13.8% KP), and (g) treated sample C (13.8% KP).