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DNA-templated silver nanoclusters for fluorometric determination of the activity and inhibition of alkaline phosphatase

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Abstract

The authors describe a fluorometric assay for determination of the activity and inhibition of alkaline phosphatase (ALP). It is based on the use of silver nanoclusters (AgNCs) templated with dC12 strands and acting as a fluorescent probe. The fluorescence of such AgNCs is initially quenched by the addition of Cu(II) in low concentration, and then recovered by the subsequent addition of pyrophosphate (PPi) due to strong binding between PPi and Cu(II). In the presence of ALP, PPi will be hydrolyzed to form phosphate ion (Pi), and this decreases the concentration of bound Cu(II). As a result, the fluorescence of AgNCs is diminished again. The decrease in fluorescence intensity is proportional to the actual activity of ALP. The assay has a detection limit as low as 0.078 mU·mL−1. The method was applied to the determination of ALP activity in spiked human serum and gave recoveries that ranged from 96.2% to 105.9%. The inhibitory effect of L-phenylalanine on the activity of ALP was also evaluated. The assay is simple and inexpensive. In our perception, it simplifies clinical measurement, thereby improving the diagnosis of ALP-associated diseases and improving the screening for new drugs.

Schematic presentation of the method for fluorescently monitoring the activity and inhibition of alkaline phosphatase (ALP) based on the use of 12 C DNA strand (dC12) templated silver nanoclusters (Ag NCs) as signal probe. The assay is based on copper ion induced quenching of the fluorescence of Ag NCs, the binding of copper ion by pyrophosphate (PPi) and the hydrolysis of PPi by ALP.

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Acknowledgements

The authors thank the support of this work by the National Key Basic Research Program of China (2014CB744502), the National Natural Science Foundation of China (No. 21575165) and the Natural Science Foundation of Hunan Province, China (No.2015JJ1019).

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  1. Linyan Guo and Dinglong Chen contributed equally to the work.

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Linyan Guo, Dinglong Chen & Minghui Yang

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  1. Linyan Guo
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  2. Dinglong Chen
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  3. Minghui Yang
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Correspondence to Minghui Yang.

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Guo, L., Chen, D. & Yang, M. DNA-templated silver nanoclusters for fluorometric determination of the activity and inhibition of alkaline phosphatase. Microchim Acta 184, 2165–2170 (2017). https://doi.org/10.1007/s00604-017-2199-y

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  • DOI: https://doi.org/10.1007/s00604-017-2199-y

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