Abstract
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 μM, respectively. The method was successfully applied to quantify hypochlorite and peroxynitrite in standard solutions and in spiked dilute serum samples.
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Acknowledgments
A PhD grant SFRH/BD/81074/2011 to Eliana Simões and financial support, project PTDC/QEQQAN/5955/2014, from Fundação para a Ciência e Tecnologia (FCT, Lisbon) are acknowledged. The use of FTIR from UCQFarma, Pharmacy Faculty of the University of Coimbra and the TEM analyses from Nanomaterials and Micromanufacturing group of Centre for Mechanical Engineering of the University of Coimbra (CEMUC) are also acknowledged.
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Simões, E.F.C., Leitão, J.M.M. & da Silva, J.C.G.E. Carbon dots prepared from citric acid and urea as fluorescent probes for hypochlorite and peroxynitrite. Microchim Acta 183, 1769–1777 (2016). https://doi.org/10.1007/s00604-016-1807-6
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DOI: https://doi.org/10.1007/s00604-016-1807-6