 ISSN 0235-7216 ISSN 2424-4538 (online) |
2009 m. Nr. 4 Determination of melamine in milk powder by capillary electrophoresis
Capillary electrophoretic (CE) technique was developed for a rapid determination of melamine. The optimized separations were carried out in 50 mmol/l tris(hydroxymethyl) aminomethane-phosphate electrolyte (pH 2.5) using a capillary coated with a poly(diallyldimethylammonium chloride)/poly(sodium-4-styrenesulfonate) bilayer and direct UV detection at 214 nm. The calibration curve was linear in the concentration range 0.2–10.0 mg/l for melamine with correlation coefficients higher than 0.9997. The detection limit was 0.06 mg/l. The proposed method was applied for a rapid determination of melamine in milk powder samples. The recovery tests established for real samples were within the range 93.5–104%. Keywords: melamine, capillary electrophoresis, milk powder |
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