Sensitive and Selective Detection of Tartrazine Based on TiO2-Electrochemically Reduced Graphene Oxide Composite-Modified Electrodes

Abstract

TiO2-reduced graphene oxide composite-modified glassy carbon electrodes (TiO2–ErGO–GCE) for the sensitive detection of tartrazine were prepared by drop casting followed by electrochemical reduction. The as-prepared material was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Cyclic voltammetry and second-order derivative linear scan voltammetry were performed to analyze the electrochemical sensing of tartrazine on different electrodes. The determination conditions (including pH, accumulation potential, and accumulation time) were optimized systematically. The results showed that the TiO2–ErGO composites increased the electrochemical active area of the electrode and enhanced the electrochemical responses to tartrazine significantly. Under the optimum detection conditions, the peak current was found to be linear for tartrazine concentrations in the range of 2.0 × 10−8–2.0 × 10−5 mol/L, with a lower detection limit of 8.0 × 10−9 mol/L (S/N = 3). Finally, the proposed TiO2–ErGO–GCEs were successfully applied for the detection of trace tartrazine in carbonated beverage samples.

Determination of Uric Acid in Co-Presence of Dopamine and Ascorbic Acid Using Cuprous Oxide Nanoparticle-Functionalized Graphene Decorated Glassy Carbon Electrode

“…The oxidation peak current was proportional to the concentration of UA in the ranges of 2.0 nM−0.6 µM and 0.6 µM−10 µM, respectively, with a low limit of detection (S/N = 3, 1.0 nM) after an accumulation time of 120 s. Cu 2 O-ErGO/GCE was utilized for the rapid detection of UA in human blood serum and urine samples with satisfactory results. when detecting UA with bare electrodes since they have similar oxidation peak potentials [10][11][12]. Nanocomposite-modified electrodes can improve the anti-interference performance and selectivity, which is a common method that is used to solve this problem.…”

“…At present, many chemically modified electrodes have been proposed for the determination of UA [9,[13][14][15][16][17][18][19][20][21][22] although their selectivity is limited, especially due to the coexistence of DA and AA. Hence, developing a modified electrode with high sensitivity and selectivity to meet clinical demands is still challengeable and desirable.Catalysts 2018, 8, x FOR PEER REVIEW 2 of 15 potentials [10][11][12]. Nanocomposite-modified electrodes can improve the anti-interference performance and selectivity, which is a common method that is used to solve this problem.…”

“…Catalysts 2018, 8, x FOR PEER REVIEW 2 of 15 potentials [10][11][12]. Nanocomposite-modified electrodes can improve the anti-interference performance and selectivity, which is a common method that is used to solve this problem.…”

Morphologically Tunable MnO2 Nanoparticles Fabrication, Modelling and Their Influences on Electrochemical Sensing Performance toward Dopamine

“…GO was prepared from cheap graphite powder by modified Hummers method referred to our previous reports [36][37][38]. The resulting GO was dispersed in 100 mL of deionized water under ultrasonication for 2 h, centrifuged twice at 6000 rpm to remove trace precipitates, and the supernatant was taken out to obtain a gold GO solution with approximately 1 mg/mL.…”

“…The MnO 2 -reduced graphene oxide modified glass carbon electrode (MnO 2 -RGO/GCE) was prepared by drop-casting MnO 2 -GO dispersion on the surface of GCE and subsequently an electrochemical reduction process [36][37][38]. The response peak currents were measured by second-order derivative linear sweep voltammetry in dopamine solution.…”