Abstract
The inability of capillary columns used in GC, GC-MS and GC-Fourier transform IR spectrometry to provide complete resolution of all components of complex mixtures such as essential oils has often been reported. By connecting fused-silica capillary columns of different polarity in series and by changing the temperature programme gradient or the column sequence, a more efficient separation system is obtained. Retention indices of some previously unresolved constituent pairs were calculated and an application to the analysis of cypress essential oil is reported.
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