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Alkaline phosphatase determination via regulation of enzymatically generated poly(thymine) as a template for fluorescent copper nanoparticle formation

  • Yue HeEmail author
  • Fengyu Tian
  • Jing Zhou
  • Bining Jiao
Research Paper
  • 13 Downloads

Abstract

We propose a new fluorometric method for alkaline phosphatase (ALP) determination. This method is based on the regulation of enzymatically generated poly(thymine) for the preparation of copper nanoparticles (CuNPs). 2′-Deoxythymidine 5′-triphosphate (dTTP) serves as the source for polymerization mediated by terminal deoxynucleotidyl transferase (TdT). This process generates poly(thymine), which acts as the template for synthesis of fluorescent CuNPs. However, if ALP catalyzes the hydrolysis of dTTP, the TdT-mediated polymerization will be disabled. This prevents the formation of CuNPs and causes a drop in fluorescence. The findings were used to design a sensitive and selective fluorometric method for ALP determination. A linear response in the activity range from 0.1 to 20 U L-1 and a limit of quantification of 0.3 U L-1 were obtained. The results indicate that the proposed method can be successfully applied to ALP assay in spiked diluted serum. This demonstrates the method’s reliability and practicability.

Graphical abstract

A fluoromoetric method for alkaline phosphatase assay has been developed based on regulation of enzymatically generated poly(thymine) as template for the formation of fluorescent CuNPs.

Keywords

Alkaline phosphatase Enzymatic polymerization Poly(thymine) Copper nanoparticles 2′-Deoxythymidine 5′-triphosphate 

Notes

Acknowledgements

The authors thank the National Natural Science Foundation of China (no. 21405125) and the Natural Science Foundation Project of Chongqing (no. cstc2018jscx-msybX0263) for financial support.

Compliance with ethical standards

All procedures performed in studies involving animals were in accordance with the ethical standards of Chinese laws and guidelines (GKFCZ2001545) and in accordance with the guidelines of the Committee on the Ethics of Animal Experiments of Southwest University [no. (2007)3].

Conflict of interest

The authors declare that they have no competing interests.

Supplementary material

216_2019_1851_MOESM1_ESM.pdf (946 kb)
ESM 1 (PDF 946 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yue He
    • 1
    • 2
    Email author
  • Fengyu Tian
    • 1
    • 2
  • Jing Zhou
    • 1
    • 2
  • Bining Jiao
    • 1
    • 2
  1. 1.Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research InstituteSouthwest UniversityChongqingChina
  2. 2.College of Food ScienceSouthwest UniversityChongqingChina

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