Electrochemical Evaluations of Glutamate at a Gold Electrode

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

M. Goreti F. Sales (Autor) Outra; Cláudia Martins (Autor) Outra; M. Fátima Barroso (Autor) Outra; M. Carmo V.F. Vaz (Autor) Outra; M. Beatriz P. Oliveira (Autor) FFUP; C. Delerue-Matos (Autor) Outra

Revista

Título: Portugaliae Electrochimica Acta

Vol. 25 Nº 1

Páginas: 173-183

ISSN: 0872-1904

Editora: Portuguese Electrochemical Society

Indexação

Scopus

Classificação Científica

FOS: Ciências médicas e da saúde > Outras ciências médicas

CORDIS: Ciências da Saúde

Outras Informações

Resumo (PT): The voltammetric behaviour of glutamate at a gold electrode was studied by means of cyclic voltammetry. From 2.6 to 11.5 pH values, glutamate originated a single cathodic peak. Potential of the peak, Ep, was -0.8 V, and it was independent from pH. The reduction of glutamate was found irreversible and mainly controlled by diffusion. An analytical approach for analysis of glutamate by means of square wave voltammetry was developed. Plots of current versus concentration presented a linear behaviour from 2.5×10-4 to 2.7×10-3 M. The detection limit was 6.3×10-5 M. Interference from compounds co-existing with glutamate in food was negligible, and in favour of an application of the proposed method to the analysis of real samples. Determination of glutamate in pure solutions resulted in acceptable deviation from the stated concentration. Relative errors ranged -2.5 to +1.6 %. <br> <br> Keywords: glutamate, gold electrode, voltammetry, flavour enhancer, food <br> <a target="_blank" href="http://www.scielo.oces.mctes.pt/scielo.php?script=sci_abstract&pid=S0872-19042007000100015&lng=en&nrm=iso&tlng=en"> Texto integral </a> <br> <br>

Abstract (EN): The voltammetric behaviour of glutamate at a gold electrode was studied by means of cyclic voltammetry. From 2.6 to 11.5 pH values, glutamate originated a single cathodic peak. Potential of the peak, Ep, was -0.8 V, and it was independent from pH. The reduction of glutamate was found irreversible and mainly controlled by diffusion. An analytical approach for analysis of glutamate by means of square wave voltammetry was developed. Plots of current versus concentration presented a linear behaviour from 2.5×10-4 to 2.7×10-3 M. The detection limit was 6.3×10-5 M. Interference from compounds co-existing with glutamate in food was negligible, and in favour of an application of the proposed method to the analysis of real samples. Determination of glutamate in pure solutions resulted in acceptable deviation from the stated concentration. Relative errors ranged -2.5 to +1.6 %. <br> <br> Keywords: glutamate, gold electrode, voltammetry, flavour enhancer, food <br> <a target="_blank" href="http://www.scielo.oces.mctes.pt/scielo.php?script=sci_abstract&pid=S0872-19042007000100015&lng=en&nrm=iso&tlng=en"> Full text</a> <br> <br>

Idioma: Português

Tipo (Avaliação Docente): Científica