Electrochemical Determination of Uric Acid, Dopamine and Tryptophan at Zinc Hexacyanoferrate Clay Modified Electrode

Abstract

A Cameroonian smectite clay has been transformed into Zn2+ homoionic form and then used to prepare film modified glassy carbon electrodes and carbon paste electrodes. These electrodes containing Zn2+ were exploited to prepare a mixed valence zinc hexacyanoferrate (ZnHCF). Cyclic voltammetry has been employed to monitor the in situ growth of ZnHCF on clay modified electrodes. Although interesting electrocatalytic properties toward UA were observed with these modified electrodes, the modified carbon paste electrodes were the most suitable for dopamine, uric acid and tryptophan detection and exhibited for these analytes extended linear range, high sensitivities, selectivity and low limit.

In situ Electrochemical Synthesis of a Composite Film Containing Nickel Hexacyanoferrate and Bentonite Clay for the Sensitive Determination of Acetaminophen and Dopamine

“…Kemmegne‐Mbouguen et al . reported the use of carbon paste electrode comprising zinc hexacyanoferrate and smectite clay composite for the sensitive determination of certain biomolecules. Organically modified clay and copper hexacyanoferrate composite is reported for the effective removal of Cs + by adsorption .…”

“…Though the immobilization of various species on Bt is well studied, immobilization of metal hexacyanoferrates on Bt and their subsequent electrochemical applications are not explored very much. Kemmegne-Mbouguen et al [39] reported the use of carbon paste electrode comprising zinc hexacyanoferrate and smectite clay composite for the sensitive determination of certain biomolecules. Organically modified clay and copper hexacyanoferrate composite is reported for the effective removal of Cs + by adsorption [40].…”

“…Cobalt hexacyanoferrate electro‐deposited on laponite is reported for the electrochemical sensing of captopril . It should be noted that two of the above composites were prepared by chemical methods and except these studies, there are no reports on the clay‐metal hexacyanoferrate composites. The rare reports on the clay‐metal hexacyanoferrate composites may be partially due to the possible repulsion (or unfavorable interaction) between the negatively charged clay layers with the negatively charged metal hexacyanoferrates.…”

“…Owing to the strong electrostatic binding of the precursor (the metal cation) with the clay, the metal hexacyanoferrate can be immobilized intact with the Bt clay . The resulting composite material is generally expected to decrease the overpotential and/or enhance the current of an electrochemical process by functioning as an efficient electron transfer mediator because of the excellent redox active properties of metal hexacyanoferrates . With the intent to make best possible electroanalytical use of such composite material, in this work, we report the immobilization of nickel hexacyanoferrate (NiHCF) with Bt clay and the use of the resulting material, represented as NiHCF−Bt, for the electrochemical determination of AC, DA, and TY.…”

Preparation, characterization and application in cobalt ion adsorption using nanoparticle films of hybrid copper–nickel hexacyanoferrate

“…The slopes of the Cu x Ni y HCF lms are 0.75-0.88 (listed in Table S1 †), indicating that the reaction at the thin lms is controlled by an ion diffusion process and a surface electron transfer process, with a tendency towards the latter. 49 The DE gradually increases with the variation in the scan rate, indicating a limitation arising from the charge-transfer kinetics 50 which weakened the reversibility. 51 The Nyquist plots (Fig.…”