Journal
ANALYTICAL CHEMISTRY
Volume 94, Issue 18, Pages 6711-6718Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c05463
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Funding
- National Natural Science Foundation of China [22004039, 52070080, 21575043, 21605052]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110291]
- Young Innovative Talents Project of Education Department of Guangdong Province [2019KQNCX027, 2020KTSCX033]
- Guangzhou Science and Technology Plan Project [202102020522, 202102080612]
- Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine [2020002]
- Innovative Training Program for College Students of Guangdong Province, South China Normal University [S202010574061]
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In this study, a highly sensitive and label-free fluorescence biosensing strategy for the determination of alkaline phosphatase (ALP) activity was introduced using cobalt oxyhydroxide (CoOOH) nanoflakes and nonenzymatic cascade recycling amplification (CRA). The method exhibits excellent specificity and a low detection limit, making it suitable for evaluating ALP activity in complex human serum samples.
Alkaline phosphatase (ALP), an essential hydrolase with crucial roles in living organisms, has widely been regarded as a biomarker for various human diseases in clinical diagnoses. Herein, taking advantage of cobalt oxyhydroxide (CoOOH) nanoflakes and nonenzymatic cascade recycling amplification (CRA), a highly sensitive and label-free fluorescence biosensing strategy for the determination of ALP activity is introduced. In our design, ALP can promote the dephosphorylation of L-ascorbic acid 2-phosphate (AAP) to reduce ascorbic acid (AA), which is then able to decompose CoOOH in a nucleic acids@CoOOH nanocomplex into Co2+ cofactors. Further, enzyme-free CRA was rapidly initiated by integrating DNAzyme recycling amplification and catalytic hairpin assembly, resulting in the generation of an abundance of G-quadruplex structure-contained DNA duplexes. In the presence of thioflavin T (ThT), analytical target ALP was signal. The experimental results show that this method can be applied an amplified and activatable fluorescence for the quantitative analysis of ALP activity with a low detection limit of 0.027 mU/mL. Moreover, this developed biosensing approach exhibits excellent specificity, and the evaluation of ALP activity in the complex human serum samples was successfully realized, indicating that it can afford a reliable, robust, and cost-effective nanoplatform for an ALP-based clinical diagnosis and for biomedical research.
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