Amperometric Differential Determination of Ascorbic Acid in Beverages and Vitamin C Tablets Using a Flow Cell Containing an Array of Gold Microelectrodes Modified with Palladium

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorMatos, Renato C.-
Autor(es): dc.creatorAugelli, Márcio A. [UNESP]-
Autor(es): dc.creatorPedrotti, Jairo J.-
Autor(es): dc.creatorLago, Claudimir L.-
Autor(es): dc.creatorAngnes, Lúcio-
Data de aceite: dc.date.accessioned2022-08-04T22:00:29Z-
Data de disponibilização: dc.date.available2022-08-04T22:00:29Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued1998-01-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1002/(SICI)1521-4109(199810)10:13<887-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/219003-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/219003-
Descrição: dc.descriptionA simple and attractive method for quantification of ascorbic acid (AA) in beers, soda, natural juices and commercial vitamin C tablets was achieved by combining flow injection analysis and amperometric detection. An array of gold microelectrodes electrochemically modified by deposition of palladium was employed as working electrode which was almost unaffected by fouling effects. Ascorbic acid was quantified in beverages and vitamin tablets using amperometric differential measurements. This method is based on three steps involving the flow injection of: 1) the sample plus a standard addition of AA, 2) the pure sample, and 3) the enzymatically-treated sample. The enzymatic treatment was carried out with Cucumis sativus tissue, which is a rich source of ascorbate oxidase, at pH 7. The calibration plots for freshly prepared ascorbic acid standards were very linear in the concentration range of 0.18-1.8 mg L-1 with a relative standard deviation (RSD) < 1%, while for real samples the deviations were between 2.7 % to 8.9 %.-
Descrição: dc.descriptionInstituto de Química Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-900-São Paulo, SP-
Descrição: dc.descriptionFaculdade Engenharia Guaratingueta UNESP, Guaratinguetá, SP-
Descrição: dc.descriptionFaculdade Engenharia Guaratingueta UNESP, Guaratinguetá, SP-
Formato: dc.format887-890-
Idioma: dc.languageen-
Relação: dc.relationElectroanalysis-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAscorbic acid-
Palavras-chave: dc.subjectBeverages-
Palavras-chave: dc.subjectFlow injection analysis-
Palavras-chave: dc.subjectModified microelectrodes-
Palavras-chave: dc.subjectVitamin C-
Título: dc.titleAmperometric Differential Determination of Ascorbic Acid in Beverages and Vitamin C Tablets Using a Flow Cell Containing an Array of Gold Microelectrodes Modified with Palladium-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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