Simultaneous voltammetric determination of vanillin and caffeine in food products using an anodically pretreated boron-doped diamond electrode: Its comparison with HPLC-DAD.
Talanta
; 170: 384-391, 2017 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-28501185
ABSTRACT
This paper describes an electroanalytical method for the simultaneous determination of vanillin (VAN) and caffeine (CAF) using an anodically pretreated boron-doped diamond electrode. Selective determination of one compound in the presence of other one was also realized. Both compounds yielded a single irreversible oxidation peak using cyclic voltammetry. The nature of the electrode reaction was found to be diffusion controlled with contribution of adsorption. By using square-wave adsorptive stripping voltammetry after 60s accumulation under open-circuit voltage, method allowed simultaneous determination of VAN and CAF in phosphate buffer, pH 2.5, with detection limits of 0.234µgmL-1 (1.54×10-6M) and 0.071µgmL-1 (3.66×10-7M), respectively. The proposed method was successfully applied in the selective and simultaneous determination of VAN and CAF in commercial food and beverage samples. In addition, for the comparison, high-performance liquid chromatographic method with diode-array detection was developed for the first time for their simultaneous determination.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Benzaldeídos
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Cafeína
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Cromatografia Líquida de Alta Pressão
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Técnicas Eletroquímicas
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Análise de Alimentos
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Estimulantes do Sistema Nervoso Central
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Antioxidantes
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article