Extraction is a simple separation of analyte from matrix.
The sample must be dried if excessively wet. Wide-sweeping conclusions are usually drawn for the entire matrix category based on a very limited set of experiments. Seldom are enough matrix types studied in a manner so that specific conclusions may be drawn. We have observed that CO2 alone is able to emulate conventional organic solvents that lie within a very narrow polarity range. This range includes organic solvents such as petroleum ether, up to the slightly more polar aromatic hydrocarbons.