title: Purification of ethoxyquin and its two oxidation products.
abstract: 2,6-Dihydro-2,2,4-trimethyl-6-quinolone (QI) and 1,8'-bis(1, 2-dihydro-6-ethoxy-2,2,4-trimethylquinoline) (DM) are two oxidation products of 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline (ethoxyquin, EQ). This paper describes several methods for the purification of technical grade EQ and for the production of pure QI and DM as standards with the purity required (>99%) for calibration of quantitative determination methods. EQ of high purity was obtained through vacuum distillation followed by a quick column chromatographic purification on silica gel. Preparative scale purity DM could be obtained through recrystallization from methanol, but QI could be purified only by a high-pressure liquid chromatographic method.
authors.affiliation: Canadian Institute of Fisheries Technology, DalTech, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: P
authors.initials: P
authors.lastname: He
authors.forename: R G
authors.initials: RG
authors.lastname: Ackman
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005015:Ethoxyquin / Q000737:chemistry / Q000302:isolation & purification*; D008401:Gas Chromatography-Mass Spectrometry; D010084:Oxidation-Reduction
chemical_list: D005015:Ethoxyquin