USE OF METHOXY-TERMINATED POLY(DIPHENYL 1H,1H,2H,2H-PERFLUORODECYLMETHYL)SILOXANE AS STATIONARY-PHASE FOR HIGH-TEMPERATURE CAPILLARY GAS-CHROMATOGRAPHY AND ITS APPLICATION IN THE ANALYSIS OF BEESWAX/

This article reports a new fluoroalkyl/phenyl-substituted medium polar stationary phase for high-temperature gas chromatography (HTGC). Coat ed on glass capillaries, the methoxy-terminated poly(diphenyl-1H, 1H, 2H, 2H-perfluoro-decylmethyl)siloxane film is thermally stable up to 4 00 degrees C. As a consequence, the introduction of a high content of fluorine into the polymer results in significantly lower retention val ues, shorter analysis time, an improved signal-to-noise ratio at high column temperatures, and, in the end, an extension of the application range for HTGC. The preparation of the stationary phase and the coatin g procedure on deactivated glass capillaries is described in detail. T he performance of the new GC phase is demonstrated on two quality test s (Grob and extended Donike) and on the separation of beeswax, which i s a complex mixture of naturally occurring compounds. (C) 1997 John Wi ley & Sons, Inc.