Modification of electrodes using conductive porous layers to confer selectivity for the voltammetric detection of paracetamol in the presence of ascorbic acid, dopamine and uric acid

A carbon needle microelectrode decorated with TiO 2 nanosheets dominated by reactive facets as a highly electrocatalytic sensing element

“…In this case, the slope value of À 56.0 mV pH À 1 closely approximates the theoretical value of À 59.0 mV pH À 1 from the Nernst equation, indicating that equal amounts of proton and electron transfer occur in the electrode reactions. This result agrees well with those obtained at multiwalled carbon nanotubes (MWCNTs) [52], graphite/polystyrene [53], and Nafion/TiO 2 -graphene [54] modified electrodes.…”

“…According to Laviron's model [57,60], the number of transferred electrons (n) and chargetransfer coefficient (α) can be deduced to be 2.54 and 0.50, respectively (see SI for the detailed calculation process). Therefore, we can conclude that a two-proton and two-electron process occurs for the AP electro-oxidation at TiO 2 -CNE, and the possible reaction mechanism is proposed according to other reports [50,52,55,61] and listed in Fig. 5.…”

A novel composite electrode based on tungsten oxide nanoparticles and carbon nanotubes for the electrochemical determination of paracetamol

“…The proposed electrode provided the lowest detection limit for PR as compared to the reported values as shown in Table 1. The parameters obtained in this study clearly indicate that the proposed electrode is more sensitive for the determination of PR as the composite of CNTs and WO 3 nanoparticles provides an increased sensitivity and a lower detection limit when compared to CNTs and polymer modified electrodes [17,2840,49]. Fig.…”

Amperometric Determination of Ascorbic Acid on an Au Electrode Modified by a Composite Film of Poly(3,4-ethylenedioxythiophene) and Superconductive Carbon Black

“…[9][10][11] However, AA always coexists with dopamine (DA) and uric acid (UA) in physiological samples, 12,13 and many conventional methods have been introduced to detect it, such as chromatography, 14 UV-visible spectrometry, 15 fluorimetry 16 and high-performance liquid chromatography. 17 Since, all of them are involved in several disadvantages, such as time-consuming, multi-step procedures and interference resulting from other chemicals, 18,19 it is urgent to develop fast, sensitive and inexpensive methods to detect AA from its coexistences.…”