Design of a Flow-Through Voltammetric Sensor Based on an Antimony-Modified Silver Electrode for Determining Lithol Rubine B in Cosmetics
Figure 2
LC-ECD chromatograms of Lithol Rubine B azo dye at various working electrodes; (a) at GCE with Lithol Rubine B 1.0 μg/mL; (b) at Ag wire with Lithol Rubine B 0.3 μg/mL; (c) at Sb/Ag with Lithol Rubine B 0.3 μg/mL. Stationary phase, HyperClone C18 column (particle size 5-μm, 250 mm × 4.6 i.d.); mobile phase, acetonitrile-water (30 : 70, v/v) containing 0.1 mM K2HPO4 (pH 3.97); flow rate 0.5 mL/min. Electrode potential was at −0.6 V versus the Ag/AgCl reference electrode.
