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Recent Developments In HPLC/FT-IR

The problems associated with the FT-IR detection of reversed phase liquid chromatographic separations are well documented 1. Strong spectral interference from the (usually) aqueous mobile phase is the worst culprit. Eluent concentrations are generally too low to be sampled directly by transmission or ATR, at the short pathlengths necessary to allow a window past water absorptions. However, a method of sample precon-centration is described which allows a 10-fold enrichment of concentration while placing the analyte in an IR transparent solvent 2. The technic is based on a solid phase extraction procedure whereby analytes are immobilized in preconcentrator cartridges. While immobilized, the sample may be washed free of buffer and dried. The analyte is then eluted in a small volume of less polar, IR-transparent solvent. This paper describes the device, then details two separations studied using the device.