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Synthetic dyes in wine, juices, lemonades, instant and non-alcoholic drinks were determined by capillary electrophoresis (CE) and liquid chromatography (HPLC) with UV-VIS diode-array detection (DAD). The results were in the very good agreement (the relative deviations D &amp;lt; 16%, D &amp;lt; 14% and D &amp;lt; 15% between CE/UV-VIS, CE/HPLC and HPLC/UV-VIS, respectively, D &amp;lt; 6% in majority of samples) with those obtained by UV-VIS spectrophotometry. A borate/phosphate buffer of pH 9.0 (12.5mM borate and 12.5mM phosphate) containing 40mM sodium dodecylsulfate (SDS) was selected as an electrolyte for CE. A 50mM phosphate buffer and 5mM tetrabutylammonium hydroxide (TBAOH) water solution of pH 4.2 in 38% (v/v) acetonitrile were used as a mobile phase for isocratic HPLC separation on Sepharon SGX C18 (3 × 150 mm, 5 µm) column. RSDs for individual colorants were &amp;lt; 0.5% for migration times, &amp;lt; 3% for electrophoretic peak areas, &amp;lt; 0.9% for retention times and &amp;lt; 2.4% for HPLC peak areas. Limits of quantitations (LOQs for 10 S/N) were 1.5–3.3 mg/l for CE when using 50 µm I.D. separation capillary or 0.2 to 0.4 mg/l for HPLC.

Capillary electrophoretic and liquid chromatographic determination of synthetic dyes in non-alcoholic drinks and wine samples