Abstract
Supercritical fluid extraction (SFE) with carbon dioxide is based on operation at temperatures and pressures over the critical point. Under these conditions, solvents have a higher diffusivity and lower density, viscosity, and surface tension than conventional solvents, facilitating the extraction selectivity and rates. Supercritical fluid is one of the most used solvents for SFE. It is a nonpolar, lipophilic solvent, and its mixture with cosolvents is required to enhance the solubility of other components. Since thermal degradation is minimized and the absence of light and oxygen limits oxidation reactions, this technology is particularly suited for some labile compounds. In this chapter the application of SFE for the recovery of fatty acids, carotenes and phenolic compounds from seaweeds is reviewed.
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