Supercritical fluid extraction was directly coupled with gaschromatography such that the entire extraction effluentwas directed onto the GC column. A sealed connectionbetween the restrictor and the column ensured that noloss of analyte could occur. The elevated pressure generated in the column itself resulted in a reduced flow ratethrough the column, making efficient trapping possible.Metal-jacketed capillary
columns were used as they cantolerate the elevated pressures required. In addition tomaximizing sensitivity, very practical extraction parameters were possible. For a 25-min extraction, with a 2.2mL/min flow rate, and the column at 40
C, analytes asvolatile as C-14 were trapped and separated. Trappingefficiency improved further with shorter extraction times,mild cooling of the column, or lower flow rates.