Supercritical Fluid Chromatography

Supercritical Fluid Chromatography (SFC) is an analytical technique that employs supercritical fluids as the mobile phase for separation. Supercritical fluids, typically carbon dioxide (CO2), are brought to a state where they exhibit both liquid-like and gas-like properties, offering unique advantages in chromatography. SFC combines features of both gas chromatography (GC) and high-performance liquid chromatography (HPLC). It offers higher diffusivity and lower viscosity compared to HPLC, enabling faster separations. SFC is particularly effective for the separation of nonpolar and moderately polar compounds due to its compatibility with nonaqueous mobile phases. It is widely used in pharmaceutical, environmental, and natural product analysis. The choice of modifier, pressure, and temperature can be adjusted to optimize separation conditions. SFC is often coupled with various detectors including mass spectrometry (MS) and ultraviolet (UV) detectors for compound identification and quantification. Advantages of SFC include reduced solvent consumption, enhanced resolution, and minimal sample preparation. However, it requires specialized equipment and expertise for operation, limiting its widespread adoption compared to HPLC and GC. Despite this, SFC continues to gain popularity for its unique capabilities in separating challenging analytes.