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Cholesterol and 4 different triglycerides such as trilaurin, trimyristin, tripalmitin, and tristearin were prepared to study the solubility interaction in the supercritical carbon dioxide (SC-CO₂) extraction. The solubility expressed as % mole fraction of five binary (SC-CO₂ and 1 solute) systems and 4 ternary (SC-CO₂ and 2 solutes) systems were measured by Supercritical Fluid Extraction (SFE)-Supercritical Fluid Chromatography (SFC) method at the pressure/temperature ranges of 36 and 64℃, and from 143.9 to 339.1 bar, respectively. The solubility isotherms in any binary system always showed the straight line, while the solubility isotherms in the ternary system showed a different solute-solute interaction between cholesterol and each saturated triglyceride. In the ternary system, the solubility of cholesterol was tended to increase by the presence of trilaurin or trimyristin, but decreased by the presence of tripalmitin or tristearin. Meanwhile, in the presence of cholesterol, the solubility of trilaurin or trimyristin was showed a tendency to decrease, while the solubility of tripalmitin or tristearin was enhanced.
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