Alternative methodologies for the determination of aldehydes by capillary electrophoresis

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Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorPereira, Elisabete Alves-
Autor(es): dc.creatorTavares, Marina Franco Maggi-
Autor(es): dc.creatorCardoso, Arnaldo Alves-
Data de aceite: dc.date.accessioned2025-08-21T16:45:29Z-
Data de disponibilização: dc.date.available2025-08-21T16:45:29Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued1999-01-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1093/jaoac/82.6.1562-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/231655-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/231655-
Descrição: dc.descriptionThis paper describes 2 alternative methodologies for the determination of selected aldehydes (formaldehyde, acetaldehyde, propionaldehyde, acrolein, and benzaldehyde) by capillary electrophoresis (CE). The first approach is based on the formation of aldehyde-bisulfite adducts and employs free solution CE with reversed electroosmotic flow and indirect detection, using 10 mmol/L 3,5-dinitrobenzoic acid (pH 4.5) containing 0.2 mmol/L cetyltrimethylammonium bromide as the electrolyte. This novel methodology showed a fairly good sensitivity to concentration, with detection limits with respect to a single aldehyde on the order of 10-40 μg/L, a reasonable analysis time (separation was achieved in <8 min), and no need for sample manipulation. A second approach was proposed in which 2,4-dinitrophenylhydrazine derivatives of the aldehydes were detected in a micellar electrolyte medium (20 mmol/L borate buffer containing 50 mmol/L sodium dodecyl sulfate and 15 mmol/L β-cyclodextrin). This latter methodology included a laborious sample preconcentration step and showed much poorer sensitivity (0.5-2 mg/L detection limit, with respect to a single aldehyde), despite the use of sodium chloride to promote sample stacking. Both methodologies proved adequate to evaluate aldehyde levels in vehicular emissions. Samples from the tailpipe exhaust of a passenger car vehicle without a catalytic converter and operated with an ethanol-based fuel were collected and analyzed; the results showed high levels of formaldehyde and acetaldehyde (0.41-6.1 ppm, v/v). The concentrations estimated by the 2 methodologies, which were not in good agreement, suggest the possibility of striking differences in sample collection efficiency, which was not the concern of this work.-
Descrição: dc.descriptionUniversidade de São Paulo Instituto de Química, C.P. 26077, 05599-970, São Paulo, SP-
Descrição: dc.descriptionUniversidade Estadual Paulista Instituto de Química, C.P. 355, 14800-910, Araraquara, SP-
Descrição: dc.descriptionUniversidade Estadual Paulista Instituto de Química, C.P. 355, 14800-910, Araraquara, SP-
Formato: dc.format1562-1570-
Idioma: dc.languageen-
Relação: dc.relationJournal of AOAC International-
???dc.source???: dc.sourceScopus-
Título: dc.titleAlternative methodologies for the determination of aldehydes by capillary electrophoresis-
Tipo de arquivo: dc.typelivro digital-
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