Abstract
The effect of skin-penetrating enhancers such as propylene glycol (PG), Azone and ethanol on the thermophysical properties of cholesteryl oleyl carbonate (COC) was investigated using differential scanning colorimetry (DSC) and microscopic Fourier-transform infrared (FT-IR) spectroscopy. The results indicate that PG did not influence the DSC thermograms and IR spectra of COC in the different ratios of COC and PG mixture; whereas Azone interacted with COC not only to lower the semectic-cholesteric phase transition temperature of COC but also to induce a new IR spectral peak at cm-11653cm-1 which shifted from the carbonyl stretching band (cm-11636 cm-1) of Azone. Ethanol did not interact with COC, but it influenced the IR spectral peak intensity of COC at cm-11253cm-1. The peak intensity at cm-11253cm-1 gradually rose with the time of ethanol evaporation and was similar to that of the temperature effect. The solubility parameter was also used to explain the miscibility and interaction between COC and PG, Azone or ethanol. © 2000 Kluwer Academic Publishers
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Lin, SY., Li, MJ. & Lin, HL. Effect of skin-penetrating enhancers on the thermophysical properties of cholesteryl oleyl carbonate embedded in a thermo-responsive membrane. Journal of Materials Science: Materials in Medicine 11, 701–704 (2000). https://doi.org/10.1023/A:1008959325997
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DOI: https://doi.org/10.1023/A:1008959325997