Abstract
A dual-read detection system is described for non-enzymatic and non-aggregation based analysis of uric acid (UA). Silver triangular nanoprisms (AgTNPs) were used as colorimetric probes, while the reduction in the fluorescence of nitrogen-doped carbon quantum dots (N-CQDs) served as the fluorometric readout. The absorption band of the AgTNPs overlaps the emission band of N-CQDs (with a peak at 440 nm). Therefore, fluorescence is reduced owing to an inner filter effect. The AgTNPs are etched if exposed to H2O2, and round nanodiscs are formed. In the presence of UA, etching of the AgTNPs is suppressed because the facets of the AgTNPs are coated with UA. The absorbance, best measured at 683 nm, increases with the concentration of the pre-added UA. The colorimetric assay works in the 0.1–45 μM UA concentration range, and the fluorometric assay between 1 and 42 μM of UA. The respective detection limits are 50 and 200 nM, respectively. The probe can be used for direct visualization of UA. The method was successfully applied to the determination of UA in urine samples.
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Acknowledgments
This work was supported by a grant from the Two-way Support Programs of Sichuan Agricultural University (Project No.03572228) and the Education Department of Sichuan Provincial, PR China (Grant No. 16ZA0039).
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The authors wish it to be known that, in their opinions, Yanying Wang and Yan Yang should be regarded as joint First Authors.
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Wang, Y., Yang, Y., Liu, W. et al. Colorimetric and fluorometric determination of uric acid based on the use of nitrogen-doped carbon quantum dots and silver triangular nanoprisms. Microchim Acta 185, 281 (2018). https://doi.org/10.1007/s00604-018-2814-6
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DOI: https://doi.org/10.1007/s00604-018-2814-6