Electrocatalytic and voltammetric determination of sulfhydryl compounds through iron nitroprusside modified graphite paste electrode

Abstract

) 2 = 0,85 V apresentou uma resposta eletrocatalítica para os compostos sulfidrílicos; L-cisteína e N-acetylcisteína. A oxidação eletrocatalítica dos compostos sulfidrílicos pelo mediador foi empregada para a determinação de L-cisteína e N-acetilcisteína. O eletrodo de pasta de grafite modificado para a determinação de L-cisteína e N-acetilcisteína apresenta uma linearidade de 9,2 × 10 -4 -2,0 × 10 -2 e 9,6 × 10 -4 -1,4 × 10 -2 mol L -1 com limite de detecção de 1,9 × 10 -4 mol L -1 e 1,5 × 10 -4 mol L -1 e desvio padrão relativo de ± 5 e 4% (n=3) ) 2 = 0.85 V presents an electrocatalytic response for sulfhydryl compounds. The electrocatalytic oxidation of sulfhydryl compounds by the mediator has been used for the determination of L-cysteine and N-acetylcysteine. The modified graphite paste electrode gives a linear range from 9.2 × 10 -4 -2.0 × 10 -2 ; 9.6 × 10 -4 -1.4 × 10 -2 mol L -1 for the determination of L-cysteine and N-acetylcysteine, respectively, with detection limit of 1.9 × 10 -4 mol L -1 ; 1.5 × 10 -4 mol L -1 and relative standard desviations ± 5% and 1.5 × 10 -3 mol L -1 ± 4% (n=3). The amperometric sensitivities are 0.024 and 0.027 µA/µmol L -1 for L-cysteine and N-acetylcysteine, respectively. The application of this electrode was tested and a commercial pharmaceutical product (Fluimucil) has been determined.

Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples

“…Of particular interest has been the use of this modified silica in sorbing metal ions from aqueous or non-aqueous solutions 15 and in electroanalysis 16 . In solution phase, many complex species may be formed on the solid surface by the reaction of metal ions with immobilized organic molecules.…”

Electrocatalitic Detection of Hydrazine Using Chemically Modified Electrodes with Cobalt Pentacyanonitrosylferrate Adsorbed on the 3–Aminopropylsilica Surface

“…The electrode external surface was smoothed with soft paper. A new surface can be produced by scraping out the old surface and replacing the carbon paste (do Carmo et al, 2003;do Carmo et al, 2015).…”

Electrode Materials (Bulk Materials and Modification)

“…Some Schiff base complexes were also used for similar purposes. 817,818 Finally, other organometallic electrocatalysts have been reported as CPE modifiers, such as rhodium acetamide, 819 iron(II)-nitroprusside, 820 or Co(II)-1-alkyl-1H-benzo [d] 1-3 triazole derivatives 821 for sensing of some pollutants.…”