Oxidation of melatonin on a glassy carbon electrode modified with metallic glucosamines. Synthesis and characterization
| Autor: | Luis Lillo, Cristóbal Castillo, Claudia A. Caro, G. Cabello, Diego Gallegos Vallejos, Francisco J. Valenzuela, Erika Lang |
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| Rok vydání: | 2016 |
| Předmět: |
Phenol red
Detection limit Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Metal Nickel chemistry.chemical_compound chemistry visual_art Electrode visual_art.visual_art_medium General Materials Science Electrical and Electronic Engineering Cyclic voltammetry 0210 nano-technology Cobalt |
| Zdroj: | Journal of Solid State Electrochemistry. 20:993-1000 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-015-3066-6 |
| Popis: | In this study, a glassy carbon electrode modified with different cobalt glucosamines (CoGlu-R), iron glucosamines (FeGlu-R), and nickel glucosamines (NiGlu-R) was used for the electroanalytical determination of melatonin in buffer solutions at pH 7.3 using cyclic and square wave voltammetry. The complexes were synthesized and characterized by IR-TF, 1H-NMR, and UV–visible spectroscopy. When comparing glucosamines of different metals, the influence of the nature of the metal on the activity is not very strong. The most active complex was CoGlu-R. The oxidation peak was used to determine melatonin in the concentration range of 10−8–10−5 M with a detection limit of 2.15 × 10−7 M (LOD). Our results indicate that the current peak is under mass-transport control and probably suggest that chemical reactions coupled with electrochemical steps are involved. The melatonin oxidation current with this kind of modified electrodes is small but this modified electrode shows high selectivity in medium-199 (glutamine, phenol red, glucose, Na+, CO3 2−) with human placental tissue; trophoblast and endothelial cells (K+, Ca2+, traces of Cu2+ and Mg2+), yet the tryptophan causes interference. |
| Databáze: | OpenAIRE |
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