Abstract
A selective and sensitive electrochemical sensor was developed for simultaneous detection of phytohormones indole-3-acetic acid (IAA) and salicylic acid (SA). The sensing interface was fabricated on a porous, three-dimensional networked graphene hydrogel (GH) modified glassy carbon electrode (GCE). The electrocatalytic behavior of IAA and SA on the surface of the modified electrode (GH/GCE) was investigated by cyclic voltammetry and linear sweep voltammetry. Results show that the oxidation reactions of IAA and SA occur at different potentials, which enable their simultaneous detection at the sensing interface. Under optimal conditions, the GH/GCE exhibited good selectivity and stability and its response, unaffected by various interferents, was linear in the range of 4 to 200 μM of IAA and SA. The limit of detection (S/N = 3) achieved were 1.42 μM for IAA and 2.80 μM for SA. The sensor performance was validated by measuring for IAA and SA in real vegetable samples with satisfactory results.
Highlights
Plant hormones, known as phytohormones, are organic chemicals produced in plants that can regulate physiological processes [1,2,3]
Indole-3-acetic acid (IAA), Salicylic acid (SA), L-Cysteine (L-Cys), L-Tyrosine (L-Tyr), L-Tryptophane (L-Trp), L-Malic acid, citric acid (CA), abscisic acid (ABA), gibberellic acid (GA3), and sodium ascorbate were supplied by Aladdin (Shanghai, China)
The graphene hydrogel (GH)/glassy carbon electrode (GCE) were dried at room temperature
Summary
Known as phytohormones, are organic chemicals produced in plants that can regulate physiological processes [1,2,3]. An electrochemical sensor, fabricated on a working electrode of with carbon was used to monitor the amounts and SA the development of carbon tapenanotubes, modified with carbon nanotubes, was usedoftoIAA monitor theduring amounts of IAA and SA pea roots [4]. Have improved physical and electrochemical properties when compared to graphene nanosheets [24– In recent years, they have gained great attention because of their high specific surface area, good electron. GH-based reduction date, GH has been used in supercapacitors and electrochemical nanocomposites show excellent electrocatalytic activity to the oxidation of ascorbic acid (AA), sensors [36,37,38,39]. 1), and the electrochemical sensor for simultaneous detection of IAA and SA on a GH modified GCE (GH/GCE).
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