M. Gupta, A. K. Pillai, Amrita Singh
Feb 15, 2011
Citations
1
Influential Citations
45
Citations
Journal
Food Chemistry
Abstract
Abstract 2-Iodosobenzoate and N,N -dimethylaniline have been used at pH 6.4 for selective conversion of iodide to 4-iodo- N,N -dimethylaniline which was extracted with ethanol, when the phase separation occurred by addition of ammonium sulphate, a process called salt-assisted liquid–liquid microextraction (SALLME), and analysed by high-performance liquid chromatography-diode array detection. Iodate was reduced to iodide before derivatisation. The method has been optimised for extracting solvent, salt for phase separation, and reaction time. A linear calibration was obtained for 10 μg-10 mg L −1 of iodide with correlation coefficient of 0.9989 and limit of detection of 3.7 μg L −1 . The SALLME produced 280-fold enrichment of the derivative. The commercial iodised table salt samples have been found highly inhomogeneous; the RSD in analysis of different aliquots of the same sample ranged 18.0-78.1%. The average recovery of spiked iodide to real samples was 98.4% with an average RSD of 7.9% (range 5.2-12.4%).