Supercritical fluid extraction (SFE), using carbon dioxide as solvent,
has gained much attention for fast and effective extraction of
a wide variety of dye and food compounds, due to the fact that is
an environmentally benign solvent. This technique works under
mild extraction conditions, thus avoiding degradation of biological
products and its solvating power is easily manipulated by changes
in pressure and temperature.With respect to polar compounds, the
low solubility in supercritical carbon dioxide limits its application
and therefore, a polar co-solvent is usually added to increase compounds
solubility (Walsh, Ikonomou, & Donohue, 1987).