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Microchimica Acta

, 186:5 | Cite as

Determination of the activity of alkaline phosphatase based on aggregation-induced quenching of the fluorescence of copper nanoclusters 

  • Yanling Hu
  • Yu He
  • Yaxue Han
  • Yili Ge
  • Gongwu Song
  • Jiangang Zhou
Original Paper

Abstract

A rapid method is described for synthesis of copper nanoclusters (CuNCs) by utilizing L-histidine as the stabilizer and ascorbic acid (AA) as the reductant. The CuNCs display blue-green fluorescence with excitation/emission peaks at 390/485 nm. A sensitive fluorometric assay was worked out for determination of alkaline phosphatase (ALP) activity. If the ALP substrate p-nitrophenylphosphate (PNPP) is enzymatically hydrolyzed, it forms p-nitrophenol (PNP) which reduces the fluorescence of CuNCs because its absorption band at 410 nm overlaps the excitation peak of CuNCs at 390 nm. In addition, the amino groups and imidazole groups on the surface of CuNCs possibly form a complex with the phenol groups of PNP. This induces aggregation-induced quenching of the fluorescence of CuNCs. The fluorescent probe has a linear analytical range that extends from 0.5 mU·mL−1 to 40 mU·mL−1 and a detection limit of 45 μU·mL−1.

Graphical abstract

Schematic illustration of a fluorometric assay for alkaline phosphatase (ALP) activity that uses L-histidine protected copper nanoclusters (CuNCs), aggregation-induced quenching, and the inner filter effect between PNP and CuNCs.

Keywords

Copper nanoclusters Alkaline phosphatase Fluorometry Inner filter effect L-Histidine Aggregation-induced quenching 

Notes

Acknowledgements

This work was financially supported by Supported by National Natural Science Foundation of China (21707030) and Wuhan Youth Science and technology plan (2016070204010133).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2018_3122_MOESM1_ESM.docx (328 kb)
ESM 1 (DOCX 328 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical EngineeringHubei UniversityWuhanChina
  2. 2.Hubei Province Key Laboratory of Regional Development and Environment ResponseWuhanChina

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