Abstract
Crystalline lamellar calcium phosphate retained m-aminobenzoic acid inside its cavity without leaching. The intense infrared bands in the 1,033 cm−1 and 1,010 cm−1 intervals confirmed the presence of the phosphate groups attached to the inorganic layer, with sharp and intense peaks in X-ray diffraction patterns, which gave basal distances of 535 pm and 947 pm for the original and the intercalated compounds, respectively. The adsorption isotherm of copper(II) on a calcium phosphate host intercalated with m-aminobenzoic acid was studied in ethanol solution to give a maximum adsorption capacity of 1.43 mmoL g−1. The material was incorporated into carbon paste electrode and its electrochemical properties were investigated. However, for a dopamine solution, an enhancement of the anodic peak current was detected due to the electrocatalytic oxidation. The electrode presented the same response for at least 150 successive measurements, with a good repeatability. The modified electrode is very stable and reproducible. The sensor was applied for dopamine determination in pharmaceutical preparation (one commercial sample (Revivan)) with success.
Highlights
Phosphates intercalated with organic compounds have aroused interest, since they can act as binders for the coordination of metal ions on their surface and be used in the construction of chemically modified electrodes (CMEs), together with a carbon paste electrode (CPE), in the study of the electrochemical behavior of these compounds, in electroanalysis, and in electrocatalysis [1, 2, 3, 4, 5, 6, 7, 8]
DA (3,4-dihydroxyphenylethylamine) is a catecholamine of great clinical and pharmaceutical interest, which acts as a chemical mediator in central nervous, cardiovascular, and hormonal systems; its concentration in extracellular fluid is lower than the ascorbic acid (AA) present
The electrochemical copper(II) properties adsorbed on calcium phosphate intercalated with m-aminobenzoic acid were explored by means of cyclic voltammetry with a PAR 273A (EG&G) potentiostatgalvanostat
Summary
Phosphates intercalated with organic compounds have aroused interest, since they can act as binders for the coordination of metal ions on their surface and be used in the construction of chemically modified electrodes (CMEs), together with a carbon paste electrode (CPE), in the study of the electrochemical behavior of these compounds, in electroanalysis, and in electrocatalysis [1, 2, 3, 4, 5, 6, 7, 8]. The present investigation deals with the electrochemical behavior of copper(II) adsorbed on calcium phosphate intercalated with m-aminobenzoic acid. This newly synthesized compound was first used to prepare a CPE and the resulting material was tested for DA oxidation. An electrochemical procedure, using an innovative, stable innovator inorganic support, is proposed
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