The identification of phenolic compounds by a gas chromatographic method on three capillary columns with the same non-polar stationary phase

The reproducibility and repeatability of retention indices values of phenolic compounds studied on several capillary columns with the same methyl-5% phenylsiloxane stationary phase indicated that various mode of such columns could be of use for the confirmative analysis. The application of three columns with manufactures' symbols of PE-5ms, PE-5ht and DB-5 has made it possible to identify 16 of free phenolic compounds present in pine needles.