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Sensitive and Selective Label-free Alkaline Phosphatase Detection Based on DNA Hairpin Probe

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Abstract

Here, we present a label-free, simple and signal-on architecture for fluorescent alkaline phosphatase (ALP) biosensor utilizing an SYBR Green I (SG) assisted fluorescence amplification method. The strategy relies on the fact that ALP provides a significant barrier to lambda exonuclease (λ exo) activity by a dephosphorylating DNA hairpin probe (HP), and SG shows a considerable fluorescence intensity enhancement upon binding to double-stranded DNA (dsDNA) than single-stranded DNA (ssDNA). Our method is simple, sensitive and selective, which can also successfully detect the activity of ALP in complex biological fluids. The results have revealed that the method allows a specific and quantitative assay of the target ALP with a wide linear response range from 0.4 to 200 U/mL and a detection limit of 0.05 U/mL.

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Authors and Affiliations

  1. State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China

    Ziwei Zhao, Wenping Zhu, Zhen Li, Jianhui Jiang, Guoli Shen & Ruqin Yu

Authors
  1. Ziwei Zhao
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  2. Wenping Zhu
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  3. Zhen Li
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  4. Jianhui Jiang
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  5. Guoli Shen
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  6. Ruqin Yu
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Corresponding authors

Correspondence to Jianhui Jiang or Ruqin Yu.

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Zhao, Z., Zhu, W., Li, Z. et al. Sensitive and Selective Label-free Alkaline Phosphatase Detection Based on DNA Hairpin Probe. ANAL. SCI. 28, 881–886 (2012). https://doi.org/10.2116/analsci.28.881

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  • DOI: https://doi.org/10.2116/analsci.28.881

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