Cathodic adsorptive stripping voltammetry of abscisic acid using pencil-lead bismuth-film electrode

Abstract

In this study, electrochemical behavior of phytohormone abscisic acid (ABA) at the bismuth-fi lm electrode (BiFE) has been investigated using square-wave cathodic stripping voltammetry. BiFE was prepared ex situ on a supporting pencil-lead graphite electrode. ABA yielded a well-defi ned voltammetric response in phosphate buffer, pH 3.0 at -1.08 V (vs. Ag/AgCl) (a pre-concentration step being carried out at a fi xed potential of -0.80 V for 120 s). The process could be used to determine ABA concentrations in the range 0.756 -15.08 µ m , with a detection limit of 0.209 µ m (55.24 ng/ml). As an example, the practical applicability of pencil-lead BiFE was tested with the measurement of ABA in seed samples of maize plant ( Zea mays L.).

Development of a Disposable Pencil Graphite Electrode Modified with Poly 1,5-Diaminonaphthalene for Voltammetric Determination of Flufenamic Acid

“…sensor.-To study the electrochemical oxidation of FFA at p-1,5-DAN/PGE(CV) sensor in the B-R universal buffer of pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11), the cyclic voltammetry approach was used as a diagnostic tool. Over the entire pH range, FFA voltammograms showed a single, well-defined anodic peak.…”

“…Pencil graphite electrode (PGE), a disposable electrode material, has garnered considerable interest in the electrochemical community among carbon electrodes and other commercial metal electrodes because of its widespread availability, low technology, low cost, good mechanical rigidity, chemical inertness, interesting electrochemical properties, low background current, wide potential window, analyte adsorption, simplicity of modification, and miniaturization. 1,2 Significantly, PGE can offer a renewable surface that is easier and quicker to re-produce than the polishing techniques commonly used on solid-state electrodes, including GCE, and the results also showed good repeatability for the individual surfaces. 1,3 Considering the high adsorption capacity and important properties of PGEs, the surfaces of PGE may be modified using a suitable electrocatalyst or electron mediator as an essential step toward the fabrication of sensitive electrochemical sensors.…”

A facile and economic electrochemical sensor for methylmalonic acid: a potential biomarker for vitamin B12 deficiency

“…In comparison with other carbon-based electrodes, PGEs are more attractive and prominent due to their sp 2 hybridized carbon, which helps in better adsorption, conductivity, sensitivity, smaller background current, and ease of modification. 16 Moreover, additional properties showcased by PGEs, such as being economic and their utilisation as disposable electrodes, assist in avoiding the hassle of time-consuming solid-electrode surface cleaning steps and electrode regeneration in-between measurements. 17 Besides this, PGEs also offer a renewable surface which is much more facile and rapid as compared to the polishing procedures required in the case of their solid counterparts, such as glassy carbon electrodes, whose surface renewal plays a paramount role because redox reactions at the electrode surface may bring changes in the GCE's surface properties.…”

β-Cyclodextrin-PANI decorated pencil graphite electrode for the electrochemical sensing of morin in almonds and mulberry leaves

“…Recently electrochemical properties of pencil graphite electrodes (PGEs) have been explored in the analysis of various organic compounds. In comparison to other working electrodes, PGE has lower background current, good adsorption properties, conductivity and ultra level electrochemical sensing ability towards different analytes [18][19][20]. Uniform composition and surface provided by PGE results in a good quality voltammetric signals of analytes.…”