Graphene oxide-circular aptamer based colorimetric protein detection on bioactive paper
| Autor: | Meng Liu, Yangyang Chang, Xin He, Xue Li, Qiang Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Graphene
General Chemical Engineering Aptamer 010401 analytical chemistry General Engineering Deoxyribozyme Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Analytical Chemistry law.invention chemistry.chemical_compound chemistry law Rolling circle replication Target protein Bioactive paper 0210 nano-technology DNA Hemin |
| Zdroj: | Analytical Methods. 11:4328-4333 |
| ISSN: | 1759-9679 1759-9660 |
| DOI: | 10.1039/c9ay01060b |
| Popis: | Paper-based sensor technology represents a new class of point-of-care (POC) diagnostic devices that is affordable, portable, rapid and scalable for manufacturing. One of the goals of developing new paper-based POC diagnostics is the need to recognize targets with high specificity and sensitivity. Herein, a graphene oxide-circular aptamer based assay is described for highly specific and sensitive detection of a target protein on bioactive paper. The circular aptamer was self-assembled onto graphene oxide to generate the biorecognition moieties, followed by the desorption reaction induced by the specific binding of the target. The released circular aptamer then hybridizes to paper-bound DNA primers, thus initiating the rolling circle amplification reaction to produce a long DNA molecule containing multiple horseradish peroxidase-mimicking DNAzyme units, which further catalyze the oxidation of substrates by H2O2 in the presence of hemin to yield a distinct colorimetric signal on paper. Under the optimal conditions, this dual amplification method can achieve detection of platelet-derived growth factor (PDGF) at a concentration as low as 100 pM. Overall, this strategy of paper-based nanobiosensors may hold great potential for rapid, accurate and inexpensive biomarker detection in POC applications. |
| Databáze: | OpenAIRE |
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