Abstract
Carbonyl compounds in crude Finnish sulphite and grain spirits have been isolated by precipitation as their 2,4-dinitrophenylhydrazones, and the unprecipitated hydrazones by adsorption on carbon and elution from the latter. The dicarbonyl compounds were identified as their bishydrazones in thin-layer chromatography. Diacethyl and 2,3-pentanedione were found present in these two grades of spirit. Aldehydes were analysed by isothermal gas chromatography on a NEGS column, after ozone oxidation o the hydrazones to the corresponding carboxylic acids. Acetaldehyde proved to be the dominating component, whereas C 3-C 6 aldehydes were present in smaller quantities. The amounts of acetaldehyde, propionaldehyde, isobutyraldehyde and isovaleraldehyde and/or 2-methylbutyraldehyde in a crude grain spirit were estimated quantitatively by the gas chromatographic method mentioned, using standard solutions of these compounds for reference. The confidence limits of the values were estimated on an electronic computer.
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