 ISSN 0235-7216 ISSN 2424-4538 (online) |
2008 m. Nr. 3-4 Determination of fumaric and maleic acids by capillary electrophoresis
The capillary electrophoretic (CE) technique was developed for a rapid determination of fumaric and maleic acids. The optimized separations were carried out in a 20 mmol/l ethylenediaminesulphate electrolyte (pH 6.5) using a capillary coated with poly(diallyldimethylammonium chloride) and direct UV detection at 214 nm. The calibration curves were linear in the concentration range 0.02–1.00 mmol/l for both anions with the correlation coefficients higher than 0.9996. The detection limits were 0.005 mmol/l for fumarate and 0.006 mmol/l for maleate. The proposed method was applied for a rapid determination of fumaric acid in apple juice and drink powder and of maleic acid in a copper plating electrolyte. The recovery tests established for real samples were within the range 95.0–102%. Keywords: fumaric acid, maleic acid, capillary electrophoresis |
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