Journal
MICROCHIMICA ACTA
Volume 183, Issue 5, Pages 1769-1777Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-016-1807-6
Keywords
Carbon dots; Microwave synthesis; Reactive oxygen species; Reactive nitrogen species; Fluorescence; Quenching
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Funding
- Fundacao para a Ciencia e Tecnologia (FCT, Lisbon) [PTDC/QEQQAN/5955/2014]
- [SFRH/BD/81074/2011]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/81074/2011] Funding Source: FCT
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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.
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