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Supercritical Fluid Chromatography Typically, SFC refers to chromatographic technique involving using supercritical carbon dioxide as the mobile phase. Since SFC uses CO2 like a liquid, it is also referred to as LC using CO2.
SCFs are used as a substitute for organic solvents in a range of industrial and laboratory processes. Carbon dioxide and water are the most commonly used supercritical fluids; they are often used for decaffeination and power generation, respectively.
Carbon dioxide is used instead of expensive organic solvents. It is the most environmentally friendly compound isolation solution making use of recycled CO2 and offers cost benefits and faster, higher resolution separations than traditional HPLC.
SFC has been used primarily for separation of chiral molecules, mainly those which required normal phase conditions. While the mobile phase is a fluid in the supercritical state, the stationary phase is packed inside columns similar to those used in liquid chromatography.
Capillary columns have many advantages over packed columns, including improved resolution, lower sample volumes, and quicker experimental times. Because of this, capillary GC is usually preferred over HPLC (when possible) for analyzing samples containing a complex mixture of analytes.

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Five of the advantages of using supercritical carbon dioxide for SFC analysis are described below. Low Polarity. The polarity of supercritical carbon dioxide is similar to n-hexane. Miscibility with Other Organic Solvents. Low Viscosity. Vaporization. Solvent Cost.
SFC has been shown to be a replacement technology for normal phase chiral HPLC, with vastly superior speed, safety, equally wide applicability, and docHub savings in solvent cost.
Compared to many methods based on conventional liquid extraction, SFE offers speed and cleaner extracts, decreasing the need for external clean-up steps. This cuts the total costs of analysis due to reduced labor-intensiveness. There is also an environmental advantage, as harmless extraction fluids are normally used.
To summarise, SFC possesses a number of advantages when compared to HPLC: shorter analysis time, higher efficiency, fast column equilibration, less harmful and more cost-effective mobile phases, easy to hyphenate with many detectors and easy to scale-up from analytical to preparative scale.
Supercritical fluid chromatography (SFC) uses highly compressed gas above its critical temperature and pressure instead of an organic solvent as the solvent phase. The SFC detecting systems are those commonly used in GC.

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