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The volatile emanations of cultivars of muskmelon were isolated by three procedures: direct sampling of melon cavity gases via a septumsealed glass probe cemented to the melon, entrapment of large volumes of headspace gas on porous polymer traps, and steam distillationextraction of pieces of melon fruit tissue. Essences were subjected to gas chromatographic analysis in high resolution wall-coated open-tubular glass capillary columns. Identifications were based on mass spectra, gas chromatographic retentions, and occasionally infrared spectra. Forty-seven compounds, dominantly esters, were identified and their concentrations during ripening were followed. The biogenetic pathways for selected esters were studied by radioassay of volatiles produced by melon tissue incubated with selected radio-labeled precursors.

SummaryThe separation number is affected by a variety of extra-column factors (e.g. the injection process, the nature of the sample, and plumbing defects in the inlet and detector) as well as factors related to column efficiency. The magnitude of the separation number, as affected by the column, varies inversely with column temperature and directly with the partition ratios of the test compounds. The interrelationships of column temperature and partition ratios are explored.