Carbon dioxide usually behaves as a gas in air at standard temperature and pressure (STP) or as a solid called dry ice when frozen (Sahena et al., 2009; Mendiola et al., 2007). If the tem­perature and pressure are both increased from STP to at or above the critical point for carbon dioxide, CO2 can adopt properties midway between a gas and a liquid and behave as a su­percritical fluid, expanding like a gas but with a density like that of a liquid. Supercritical CO2 is becoming an important commercial and industrial solvent due to its role in chemical extraction in addition to its low toxicity and environmental impact (Cooney et al., 2009). The relatively low temperature of the process and the stability of CO2 also allow most com­pounds to be extracted with little damage or denaturing. The main drawbacks of this method include high power consumption and expense and difficulty involved in scaling up at this time (Eller, 1999).