Saturation pressure parameter is one of the most important properties in thermodynamic studies. Besides experimental measurements, many correlations and equations have been developed to determine saturation pressure for range of components. However, most of them require critical properties of the components, which are unavailable for most of heavy and low volatile components. In this paper, a technique was suggested to estimate the saturation pressure of low volatile components dissolved in supercritical carbon dioxide. The Dilute Solution Theory (DST) model was applied to two compound groups, namely the arenes (aromatic compounds) and the vegetable oils, by fitting two common adjustable parameters for each group. The saturation pressure for each compound was calculated using a newly developed equation. It was found that the estimated saturation pressures at each temperature studied were in good agreement with the values calculated by Antoine equation or by data extrapolation from literature. (C) 2006 Elsevier B.V. All rights reserved.