An intervalence complex on chitosan surface and its application for isoniazid detection in synthetic samples
| Autor: | Devaney Ribeiro do Carmo, Rômulo Davi Albuquerque Andrade, Priscila Fernanda Pereira Barbosa, Eduardo Guimarães Vieira |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Science and Technology of Goiás, Universidade de São Paulo (USP) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Detection limit
Chitosan Materials science Copper hexacyanoferrate Cyclic voltammetry Scanning electron microscope Infrared spectroscopy 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Redox Amperometry 0104 chemical sciences Carbon paste electrode Square wave isoniazid General Materials Science 0210 nano-technology Spectroscopy Nuclear chemistry |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2020-12-12T02:02:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) In the current article it is described the preparation of a natural polymeric material formed by chitosan and a complex (copper hexacyanoferrate II) for application as voltammetric sensor for isoniazid (ISO) using a carbon paste electrode (GPE). The material (CuFeCHT) was characterized by scanning electron microscopy (SEM), infrared spectroscopy (FT-IR), X-Ray diffraction (XDR) and Energy Dispersion Spectroscopy (EDS). The CuFeCHT voltammetric behavior was achieved using a GPE which showed two redox couples with formal potential (Eθ’) of 0,30 and 0,73 for each process, attributed to Cu+/Cu2+ and Fe2+(CN)6/Fe3+(CN)6 processes, respectively (KCl; 1.00 mol L−1; ν = 20 mV s−1; 40% (w/w)). ISO determination was carried out employing cyclic voltammetry (CV) and square wave voltammetry (SWV). For SWV method a detection limit (3σ) of 2.47 × 10−5 mol L−1 with relative standard deviation of 0,7% (n = 3) and amperometric sensitivity of 7.13 × 10−3 A mol L−1 was achieved. The effect of concomitant species on the voltammetric response was investigated using both techniques and the proposed methodology was applied for ISO determination using synthetic human urine samples spiked with ISO. Recovery values varied from between 98.28 and 105.14% for CV and between 95.29% and 100.93%. São Paulo State University (Unesp) School of Engineering Department of Physics and Chemistry Campus of Ilha Solteira Federal Institute of Education Science and Technology of Goiás Campus of Luziânia Department of Fundamental Chemistry Institute of Chemistry University of São Paulo São Paulo State University (Unesp) School of Engineering Department of Physics and Chemistry Campus of Ilha Solteira |
| Databáze: | OpenAIRE |
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