title: Electrochemical Determination of Brilliant Blue and Tartrazine Based on an Ionic Liquid-Modified Expanded Graphite Paste Electrode.
abstract: A sensitive electrochemical method was developed for the simultaneous determination of Brilliant Blue (BB) and tartrazine (Tz) using an ionic liquid-modified expanded graphite paste electrode (IL-EGPE). The IL-EGPE was prepared by mixing ionic liquid-expanded graphite composite (IL-EG) with solid paraffin. Compared with the EGPE, the IL-EGPE remarkably enhanced the electrocatalytic oxidation signals of BB and Tz. Under optimal experimental conditions, the designed IL-EGPE exhibited wide linear responses to BB and Tz ranging from 5.0×10(-9) to 4.0×10(-6) M and 1.0×10(-8) to 1.0×10(-6) M, respectively. The detection limits for BB and Tz were 2.0×10(-9) M (1.6 ng/mL) and 3.3×10(-9) M (1.8 ng/mL) at an S/N of 3, respectively. This electrode showed good reproducibility, stability, and reusability. The proposed method was successfully applied in the simultaneous determination of BB and Tz in a soft drink with satisfactory results.
authors.affiliation: Changzhou University, School of Petrochemical Engineering, Changzhou 213164, People's Republic of China.
authors.forename: Wenchang
authors.initials: W
authors.lastname: Wang
authors.forename: Ye
authors.initials: Y
authors.lastname: Chen
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Xue
authors.initials: X
authors.lastname: Wang
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Chen
mesh_terms: D001557:Benzenesulfonates / Q000032:analysis*; D001628:Beverages / Q000032:analysis; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D017743:Equipment Reuse; D005504:Food Analysis; D005505:Food Coloring Agents / Q000032:analysis*; D006108:Graphite; D007202:Indicators and Reagents; D052578:Ionic Liquids; D057230:Limit of Detection; D015203:Reproducibility of Results; D013645:Tartrazine / Q000032:analysis*
chemical_list: D001557:Benzenesulfonates; D005505:Food Coloring Agents; D007202:Indicators and Reagents; D052578:Ionic Liquids; D006108:Graphite; C006796:brilliant blue; D013645:Tartrazine