The gas–liquid chromatographic separation of vanillin, syringaldehyde, and p-hydroxybenzaldehyde has been effected using a 15% Apiezon N on Fluoropak column at 220 °C. Using standard solutions of the reference compounds and measuring peak areas, the percentage composition of mixtures of milligram amounts of these aldehydes may be determined quantitatively to within 5%.The method has been applied to the quantitative analysis of the phenolic aldehydes resulting from the alkaline nitrobenzene oxidation of aspen and spruce wood and wheat straw meals as well as the lignins isolated from these same plant materials. The results are reproducible and generally in good agreement with those reported earlier for similar lignified substances as determined using the spectrophotometer method of Stone and Blundell.
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Pepper et al. (1962) studied this question.