Abstract
Glutathione-capped copper nanoclusters (CuNCs) are presented that display aggregation-induced emission (AIE). This feature was exploited for selective and sensitive quantification of creatinine (CRN) which is an important diagnostic parameter. In the presence of Al3+ ions, such CuNCs rapidly aggregate, and this induces enhanced a red emission. The AIE nature of CuNCs was proven via TEM and fluorimetry. On addition of CRN, the coordination between CRN and Al3+ ions led to the quenching of fluorescence due to weakening the AIE. The best fluorescence intensity was measured at excitation/emission peaks of 360/585 nm. Quenched fluorescence intensity showed a linear dependence on the concentrations of CRN in the range of 2.5–34 μgL−1 with a detection limit of 0.63 μgL−1. The sensing mechanism of probe for CRN detection is discussed. The probe was applied to the determination of CRN in spiked human serum samples and gave satisfactory results.
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Authors thank the University of Tabriz for the support provided. Roghayeh Jalili as a postdoc researcher gratefully acknowledges use of the services and facilities of the University of Tabriz.
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Jalili, R., Khataee, A. Aluminum(III) triggered aggregation-induced emission of glutathione-capped copper nanoclusters as a fluorescent probe for creatinine. Microchim Acta 186, 29 (2019). https://doi.org/10.1007/s00604-018-3111-0
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DOI: https://doi.org/10.1007/s00604-018-3111-0