The solubilities of cholesterol and its esters-cholesteryl acetate, cholesteryl butyrate and cholesteryl benzoate-in super-critical carbon dioxide were measured using a dynamic flow method. We also examined the effect of a polar cosolvent, namely methanol or acetone, on the solubility of these compounds in super-critical carbon dioxide and found that the solubilities of these compounds are enhanced several fold depending on the pressure of the system. The solubility data were correlated using the Peng-Robinson equation of state (PR EOS) and density-based correlations. Model parameters for the systems studied are obtained through data regression. (C) 2003 Elsevier B.V. All rights reserved.