Methyl keton-test-positive substances in commercial potassium sorbate

Abstract

Separation and identification of salicylaldehyde-test-positive substances from commercial samples of potassium sorbate are described. Carbonyl compounds in the sample were separated as 2, 4-dinitrophenyl-hydrazones, which were divided into acidic and neutral components. Identification was performed by thin-layer chromatography and by visible and infrared spectroscopy. Acetaldehyde, one of the test-positive substances, was identified. Fumaraldehydic acid, being considered to be another moiety of oxidative degradation products of potassium sorbate, was also identified.