The supported liquid extraction (SLE) process is analogous to traditional liquid-liquid extraction (LLE) and utilizes the same water immiscible solvent systems for analyte extraction. Instead of shaking the two immiscible phases together, in SLE, the aqueous sample is immobilised on an inert support and the organic phase flows through the support, eliminating problems such as emulsion formation and low analyte recoveries.

This application note highlights the use of ISOLUTE SLE+ supported liquid extraction plates for the extraction of corticosteroids from human plasma.