Abstract
A method is presented for the determination of 2,4- and 2,6-toluenediamine (TDA) in aqueous extracts of food-contract boil-in-bag and retortable pouches. The extracts are subjected to a methylene chloride extraction clean-up procedure which effects a 50-fold concentration of the amines. A 500-μl portin of the concentrate is analyzed by high-performance liquid chromatography on a reversed-phase, 5-μm, C 8 column. The mobile phase is 10% acetonitrile in aqueous pH 7.4 phosphate buffer at a flow-rate of 1 ml/min. The lower limit of quantitaion is ca. 1 ng of TDA on-column or a concentration of ca. 40 ng of TDA per liter in the unconcentrated aqeous extracts. Recovery data averaged 89 ± 4% for standard solutions and spiked extracts over the concentration range 50–2000 ng/l. Results of migration studies are also presented.
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