Simultaneous voltammetric determination of tyrosine and paracetamol using a carbon nanotube-graphene nanosheet nanocomposite modified electrode in human blood serum and pharmaceuticals

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

“…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.…”

Fabrication of electrochemical sensor for paracetamol based on multi-walled carbon nanotubes and chitosan–copper complex by self-assembly technique

“…The anodic peak currents increased with the pH value increasing from 5.7 to 7.0, and then decreased with the pH value increasing from 7.0 to 8.0, suggesting that the oxidation reaction of paracetamol was kinetically less favorable at higher pH [15]. But paracetamol was hydrolyzed to p-aminophenol at very low pH values [27]. 10 Furthermore, the redox potential difference (ΔEp) was 0.32 mV.…”

“…CNTs possess many unique properties such as good electrical conductivity, high electrocatalytic effect, strong adsorptive ability and excellent biocompatibility [20]. Owing to these properties, many studies on sensors for paracetamol based on CNTs have been reported in the past few decades [21][22][23][24][25][26][27][28][29]. However, the sensitivity of these reported methods is not high enough.…”

Multi-walled Carbon Nanotubes/Graphite Nanosheets Modified Glassy Carbon Electrode for the Simultaneous Determination of Acetaminophen and Dopamine

“…Hence, the synergistic effect of MWCNTs and GNSs might offer a favorable microenvironment for electroactive species through the formation of a 3D conductive network, which was beneficial for accelerating electron transfer between the modified electrode and species in solution. 39 The effect of scan rates on peak currents of AC and DA on MWCNTs/GNSs/GCE was investigated in pH 6.8 PBS buffer (not shown here). Both oxidation and reduction currents of AC at about 445 and 375 mV were linear with square root of potential scan rates.…”