A gas chromatograph, equipped with a flame ionization detector,
was used to qualitatively and quantitatively analyze the monoterpenes
of Virginia pine. The instrument was adjusted for optimum performance
prior to sample analysis. Two packed columns with stationary
phases of different polarity, Carbowax 20M and polyphenyl ether +
Igepal + Versamid-9JO, were used predominantly for analytical
determinations. However, a S.C.O.T. column coated with UCON
LB550X stationary phase, was used for measuring some compounds.
The monoterpenes of Virginia pines were analyzed from foliage,
phloem, and bark distillates, pentane extracts of xylem resin and
beetle pitch tubes, and foliage and tree-bole vapors. Qualitative
determinations were made by comparing relative retention time with
known chemicals and mixtures of chemicals, and by introducing these
standards into the sample. Quantitative determinations were based
on normalization of peak areas for the known components. Peak
areas measured with a disc integrator for liquid samples, and with
a planimeter for vapor samples.
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