Determinação voltamétrica de ácido fólico em superfície de eletrodo sólido com filme intermetálico 'AG IND.2''HG IND.3.02': aplicação em sucos de frutas in natura e industrializados

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Paula, Cleide Garcia de [UNESP]
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Estadual Paulista (Unesp)
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11449/110698
Resumo: In this work we developed na electroanalytical method on the surface of solid intermetallic electrode film Ag2Hg3.02 (AgSIE) for the determination of folic acid (FA). The AgSIE was used instead of liquid Hg electrode in order to attend to the concept of green chemistry . We applied the technique of square wave voltammetry toAdsorptive Stripping Voltammetry (SWAdSV), considering the analytical frequency selectivity and sensitivity of the method. The FA showed a peak reduction in -0,6 vs. Esce, with characteristics of adsorptive process. Optimized the experimental parameters and the analytical curves (n = 5) were constructed by diluting the standard solution in the range from 0.2 x 10-7 to 10.6 x 10-7 mol L- 1. The limits of detection and quantification were obtained for the FA LD = 6.79 x 10-10 mol L -1 and LQ = 2 x 10-8 mol L- 1, respectively. The standard addition method was used for determination of FA in folate pharmaceutical containing 5.0 mg / tablet , resulting in recovery of R % = 98.4  2.7% (mean = 4.9 ± 0 1 ) mg ( FAFI ), R = 99.9 %  2.9% (mean = 4.9 ± 0.15) mg ( FAFII ) and the multivitamin 0.25 mg / tablet : R % = 99.4  1.54 % ( m = 0.24 ± 0.03 ) mg ( FAFIII) and in samples of fruit juices in natura and processed , the concentrations from 0.3 to 84.4 mg L- 1 were obtained. The technique of High Efficiency Liquid Chromatography (HPLC), was utilized in the determination of FA in pharmaceutical and fruit juices for comparison, so the results was conducted in ODS - C18 column, 150 x 4.6 mm ( 5 m) mobile phase ACN / HAC-KOH, elution gradient (10:90, v / v ), pH 2.88, flow of 0.5 mL min -1 and UV-vis detector máx. 280 nm. The analytical curve (n = 3) of folic acid was built in the range from 1.41 x 10-6 to 4.53 x 10-5 mol L- 1 and calculated, LD = 8.38 x 10-8 mol L- 1 and LQ = 2.49 x 10-7 mol L- 1 . Accuracy was assessed pharmaceutical (5.0 mg / tablet ) for two dilutions 5:10 g mL -1, FAFI in obtaining the...