Abstract
A sensing platform is presented for the determination of alkaline phosphatase (ALP) activity based on the cooperation of DNAzyme-Au spherical nucleic acid nanoprobe with the graphene-oxide–loaded hybridization chain reaction (HCR/GO) system to achieve good detection sensitivity and specificity. This assay takes advantage of the strong affinity of pyrophosphate (PPi) to Cu2+ ions and the fact that ALP can hydrolyze pyrophosphate (PPi) to release free Cu2+ ions. In the presence of ALP, the released Cu2+ can promote the Cu2+-dependent DNAzyme to cleave the substrate that generates a shorter DNA fragment, which is responsible for further triggering the HCR/GO system to form a long fluorescence dsDNA and thereby giving an amplified fluorescence signal. Linear calibration range was obtained from 0.2 to 10 U L−1, and the limit of detection (LOD) is about 0.14 U L−1. The feasibility of the proposed method was validated by spiking ALP standards in bovine serum. The recovery ranged from 97.2 to 104.6%, and a coefficient of variation (CV) of less than 8% (n = 3) was obtained. This assay strategy was also applied to evaluate the ALP inhibitor efficiency, which indicates that the assay has potential for drug screening.
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Acknowledgments
The authors are thankful for the support of this work by the National Natural Science Foundation of China (Grant No. 21575165), the Hunan Provincial Science and Technology Plan Project, China (No. 2019TP1001), and the Innovation-Driven Project of Central South University (2020CX002).
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Lv, Z., Wang, Q. & Yang, M. DNAzyme-Au nanoprobe coupled with graphene-oxide–loaded hybridization chain reaction signal amplification for fluorometric determination of alkaline phosphatase. Microchim Acta 188, 7 (2021). https://doi.org/10.1007/s00604-020-04681-1
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DOI: https://doi.org/10.1007/s00604-020-04681-1