抄録
Food preservatives, butyl p-hydroxybenzoate, benzoic acid, dehydroacetic acid, sorbic acid, salicylic acid, nitrofurazone and nitrofurylacrylamide were separated and identified by the thin layer chromatographic method. Thin layers of silica gel (200 mesh) containing 5% gypsum and the solvent system of benzene-chlorofolm-isopropanol (60 : 30 : 10) were used in this experiment. This method was applied to the quantitative determination of dehydroacetic acid in food stuffs. A small amount of dehydroacetic acid (0.005∼0.05mg) on the thin layer chromatogram was extracted with 0.1N sodium hydroxide and detemined by measuring the absorbance at 232 mμ of the extract.
