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Development of an Electrochemical Sensor to Detect Dopamine and Ascorbic Acid Based on Neodymium (III) Oxide and Chitosan
Author(s) -
Nagles Edgar,
Calderón Jorge A.,
GarcíaBeltrán Olimpo
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201600729
Subject(s) - ascorbic acid , cyclic voltammetry , chitosan , detection limit , neodymium , chemistry , dielectric spectroscopy , electrochemical gas sensor , nuclear chemistry , electrochemistry , electrode , inorganic chemistry , chromatography , biochemistry , laser , physics , food science , optics
Neodymium (III) oxide (Nd Ox ) was dispersed in chitosan dissolution and deposited on a glassy carbon electrode (chitosan‐Nd Ox /GCE). The surface properties of the chitosan‐Nd Ox /GCE were evaluated with FeCN 6 −3 solution using cyclic voltammetry and electrochemical impedance spectroscopy. The modified electrode was used in the determination of individual dopamine (DP) and ascorbic acid (AA) with square wave adsorptive voltammetry. Under optimal parameters (pH 4.0; accumulation time; t ACC 60s and accumulation potential; E ACC 0.10 V) for DP and (pH 3,0; t ACC 60s and; E ACC −0.20 V) for AA, anodic peak currents were proportional to the concentration of DP and AA between 0.90 and 17.0 μmolL −1 , with detection limit of 0.079 μmolL −1 for DP and 0.12 μmolL −1 for AA. The sensor was used in the determination of DP and AA in human urine samples and vitamin C tablets with consistent results. The new sensor is easy to develop. In addition, the sensitivity in particular for AA was improved compared with previous work.