Electrochemical Behavior and Electroanalytical Determination of Indole‐3‐Acetic Acid Phytohormone on a Boron‐Doped Diamond Electrode

Abstract

In this work, a boron-doped diamond (BDD) electrode was used for the electroanalytical determination of indole-3-acetic acid (IAA) phytohormone by square-wave voltammetry. IAA yielded a well-defined voltammetric response at + 0.93 V (vs. Ag/AgCl) in Britton-Robinson buffer, pH 2.0. The process could be used to determine IAA in the concentration range of 5.0 to 50.0 mM (n = 8, r = 0.997), with a detection limit of 1.22 mM. The relative standard deviation of ten measurements was 2.09 % for 20.0 mM IAA. As an example, the practical applicability of BDD electrode was tested with the measurement of IAA in some plant seeds.

Water-dispersed carboxymethyl cellulose-montmorillonite-single walled carbon nanotube composite with enhanced sensing performance for simultaneous voltammetric determination of two trace phytohormones

“…Thus, the electrochemical effective surface area of CMC-SWCNT-MMT/GCE can be calculated by the slope of the plot of Q vs. t 1/2 obtained by chronocoulometry using 5 mM Fe(CN) 6 3-/4− as model complex based on the Anson equation [30][31][32][33]: Q (t)=2nFACD 1/2 t 1/2 π −1/2 + Q dl + Q ads , where n is the electron number involved in the electrode reaction, A is the effective surface area, D is diffusion coefficient, v is the scan rate, C is the substrate concentration, Q dl is double layer charge which could be eliminated by background subtraction, Q ads is Faradaic charge, other symbols have their usual meanings. As to Fe(CN) 6 3−/4 , n=1, D=7.6×10 −6 cm 2 /s. The electrode effective surface area was obviously increased when CMC, MMT, and CMC-MMT was modified onto the surface of the bare GCE ( Fig.…”

“…However, the bad aqueous solubility and poor adhesion of pure CNT presented a challenge for realizing a practical application of film modified electrode. Hence, the water stability and adhesion of CMC-SWCNT-MMT/GCE was evaluated by repeating CVs tests for 100 cycles in 5 mM Fe(CN) 6 3−/4− containing 0.1 M KCl at the v of 50 mV s −1 (Fig. 3).…”

“…Every day, the stability of the film modified GCE was measured by CVs tests in 5 mM Fe(CN) 6 3-/4− containing 0.1 M KCl at the scan rate of 50 mV s −1 . The RSD of redox current peaks of CVs of SWCNT/GCE was 1.51 and 2.17 %, respectively (Fig.…”

“…methods have also been proved to be a powerful tool due to their advantages of high sensitivity, low cost, rapid response, low reagent consumption, simple operation, and convenient apparatus. However, there have been relatively few reports regarding phytohormone electrochemical chemosensors owing to no or low electrochemical activities of phytohormones, no or bad electrocatalytic abilities of electrode-modified materials for the oxidation or reduction of phytohormones, complex electrochemical behaviors and dynamics caused by biotic and abiotic factors, and the passivation (fouling) of the electrode surface resulted from the electrooxidation and electropolymerization of phytohormones [4][5][6][7][8].…”

Sensitive Detection of Capsaicin by Adsorptive Stripping Voltammetry at a Boron‐Doped Diamond Electrode in the Presence of Sodium Dodecylsulfate

“…Boron doped diamond (BDD) electrodes have been extensively used in recent years in electrosynthesis, electroanalysis, electrochemical combustion, and as electrocatalyst supports [31][32][33], as they offer a number of advantages over traditionally employed electrodes. Furthermore, BDD electrodes are particularly attractive for electrochemical applications due to their high corrosion resistance, the very wide electrochemical window in aqueous solutions, low and stable background current, low sensitivity to dissolved oxygen, slight adsorption of polar molecules, long-term response stability and excellent activity towards any redox analytes [34][35][36][37].…”