Simultaneous Determination of Synthetic Food Dyes Using a Single Cartridge for Preconcentration and Separation Followed by Photometric Detection

Figure 5

Elution profile obtained for analysis of “Fresh” and “Orange” beverages. Eluent: 2 mmol·L⁻¹ KH₂PO₄ (pH 3) containing 2.5% acetonitrile with step increase to 10% after 17 mL. The rate of the eluent is 1 mL·min⁻¹. The detector wavelength is 427 nm and 484 nm for TAR and SY, respectively.