title: Gas-liquid chromatographic determination of benzoic acid and sorbic acid in foods: NMKL collaborative study.
abstract: A gas-liquid chromatographic method for the simultaneous determination of benzoic acid and sorbic acid in foods was collaboratively studied by 8 laboratories. Benzoic and sorbic acids are isolated from food by successive extractions with ether, sodium hydroxide, and methylene chloride, converted to trimethylsilyl (TMS) esters, and determined by gas-liquid chromatography. Phenylacetic acid and caproic acid are used as internal standards for benzoic acid and sorbic acid, respectively. Seven samples were collaboratively studied: almond paste, fish homogenate, and apple juice with benzoic and sorbic acid levels from 0.04 to 2 g/kg. Average recoveries (%) for benzoic and sorbic acids were as follows: almond paste, 99.6 and 101.2; fish homogenate, 99.2 and 97.4; and apple juice 98.2 and 106.6. The reproducibility coefficients of variation (%) for benzoic and sorbic acids at 0.5-2 g/kg levels were 3.5-6.1 and 5.2-9.0; and at the 0.04 g/kg level, 14.7 and 23.3, respectively. The method has been adopted official first action at 0.5-2 g/kg levels.
mesh_terms: D001565:Benzoates / Q000032:analysis*; D019817:Benzoic Acid; D002849:Chromatography, Gas; D005231:Fatty Acids, Unsaturated / Q000032:analysis*; D005504:Food Analysis / Q000592:standards*; D013011:Sorbic Acid / Q000032:analysis*
chemical_list: D001565:Benzoates; D005231:Fatty Acids, Unsaturated; D019817:Benzoic Acid; D013011:Sorbic Acid