Abstract
Over the last decades, packed column supercritical fluid chromatography (pSFC) using carbon dioxide (CO2) as supercritical fluid has gained interest as a complementary separation technique to liquid chromatography (LC). Various commercial solutions for the hyphenation to atmospheric pressure ionization (API) including electrospray (ESI) and atmospheric pressure chemical ionization (APCI) have been described using split-flow or full-flow introduction approaches. This review discusses various aspects of the hyphenation using these two approaches. It also illustrates the difference between LC-MS and SFC-MS. The benefits and challenges of the decoupling of the separation mobile phase from the ionization conditions are also pointed out. The effect of CO2 on ESI performance and the adduct reduction are also discussed. Finally, limitation of current hardware and the limited use of smaller column internal diameters (i.d.) are discussed. Graphical abstract.
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