Carbon dots prepared from citric acid and urea as fluorescent probes for hypochlorite and peroxynitrite

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Simoes, EFC (Autor) Outra; Leitao, JMM (Autor) Outra; Joaquim C G E Esteves da Silva (Autor) FCUP

Revista

Título: Mikrochimica Acta

Vol. 183

Páginas: 1769-1777

ISSN: 0026-3672

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 105 Citações

Scopus - 108 Citações

Outras Informações

ID Authenticus: P-00K-987

DOI: 10.1007/s00604-016-1807-6

Abstract (EN): Carbon dots (CDs) were prepared from citric acid and urea, and their fluorescence was found to be quenched by hypochlorite and peroxynitrite. Microwave based synthesis gives CDs with excitation/emission wavelength-dependent quantum yields (8 % at 400/520 nm; 10 % at 360/451 nm; 12 % at 350/420 nm). Quenching of fluorescence depends on pH values, and response is most selective and sensitive to hypochlorite at pH 4, and to peroxynitrite at pH 9. The lower detection limits are 0.5 and 1.5 mu M, respectively. The method was successfully applied to quantify hypochlorite and peroxynitrite in standard solutions and in spiked dilute serum samples.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9