UVA:UVB sunscreen determination by second-order derivative ultraviolet spectrophotometry.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorSouza, Jacqueline de-
Autor(es): dc.creatorViana Junior, Nilton de Souza-
Autor(es): dc.creatorSoares, Cristina Duarte Vianna-
Data de aceite: dc.date.accessioned2019-11-06T13:30:20Z-
Data de disponibilização: dc.date.available2019-11-06T13:30:20Z-
Data de envio: dc.date.issued2014-09-08-
Data de envio: dc.date.issued2014-09-08-
Data de envio: dc.date.issued1999-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/3622-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/556733-
Descrição: dc.descriptionUVA:UVB protective agents are important constituents in many cosmetics and sunscreen preparations. Analytical methodologies which enable the determination of combined substances with different spectrophotometric characteristics are therefore useful and cost-effective. To this end, the following substances in a sunscreen gel were analyzed: the UVB and UVA protective substances, 2-hydroxy-4-methoxy-benzophenone-5-sulphonic acid (BZP) and 2 phenylbenzymidazole-5-sulphonic acid (PBS), respectively, were evaluated by second-order derivative ultraviolet spectrophotometry in distinct solvents and wavelengths. The method used for determination of BZP in 95% ethanol was the zero-peak (ZP) at 356.0 nm. For PBS, the solvent used was 0.1 mol l_1 triethanolamine, and the methods were the ZP at 317.5 nm and the peak-peak (PP) at 317.5–323.0 nm. Statistical results for the methods showed linearity of 0.9999 and an average precision of 1.12% (ZP) for BZP, and 0.55% (ZP) and 0.63% (PP) for PBS. The average recovery for BZP and PBS were 97.28% (ZP), 103.13% (ZP) and 103.71% (PP), respectively. © 1999 Elsevier Science S.A. All rights reserved.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Il Farmaco concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3456021267480.-
Palavras-chave: dc.subjectUVA:UVB sunscreen-
Palavras-chave: dc.subjectUltraviolet spectrophotometry-
Palavras-chave: dc.subjectSecond-order derivative-
Palavras-chave: dc.subjectCosmetics determination-
Título: dc.titleUVA:UVB sunscreen determination by second-order derivative ultraviolet spectrophotometry.-
Aparece nas coleções:Repositório Institucional - UFOP

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