Abstract
Supercritical fluids have several advantages over liquids when used as extraction solvents. These are fully detailed in Chapter 1 and include:
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improved extraction efficiency in many cases with respect to Soxhlet extraction, resulting in reduced extraction times:
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supercritical fluids have more rapid mass-transfer properties than do liquids and therefore penetrate and extract components in sample matrices more quickly and efficiently; in contrast to Soxhlet extraction, which requires several hours or days to perform, supercritical fluid extraction (SFE) can yield quantitative extraction in as little as 10 min [1];
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on some compound groups SFE is reported to give better recoveries than can liquid—liquid extraction [2];
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the possibility of adjusting the solvent strength of the fluid: as the solvating power of a supercritical fluid is directly related to its density (see Figure 4.1) it can be tuned to the analysis as required; for example, the sample can be extracted exhaustively at constant high density to provide quantitative analysis, or at various pressures or with different mobile phases to fractionate the sample;
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the extraction of heat-sensitive or reactive compounds at low temperatures
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the use of extraction solvents, such as CO2which are non-toxic and inexpensive
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the rapid removal of the supercritical fluid from the extracted analytes on decompression.
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Vandenburg, H.J., Bartle, K.D., Cotton, N.J., Raynor, M.W. (1998). Coupled supercritical fluid extraction-capillary supercritical fluid chromatography. In: Ramsey, E.D. (eds) Analytical Supercritical Fluid Extraction Techniques. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4948-8_6
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