A colorimetric aptasensor for sulfadimethoxine detection based on peroxidase-like activity of graphene/nickel@palladium hybrids
| Autor: | Xiaochi Chen, Huimin Zhao, Yaobin Zhang, Aicheng Wang, Xie Quan, Bing Tan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Aptamer
Biophysics Analytical chemistry chemistry.chemical_element Sulfadimethoxine Nanoparticle Biosensing Techniques 02 engineering and technology 01 natural sciences Biochemistry Catalysis law.invention Limit of Detection Nickel law medicine Colorimetry Molecular Biology Peroxidase Detection limit Graphene Benzidines 010401 analytical chemistry Water Hydrogen Peroxide Cell Biology Aptamers Nucleotide 021001 nanoscience & nanotechnology 0104 chemical sciences Lakes chemistry Reagent Nanoparticles Graphite 0210 nano-technology Oxidation-Reduction Palladium medicine.drug Nuclear chemistry |
| Zdroj: | Analytical Biochemistry. 525:92-99 |
| ISSN: | 0003-2697 |
| DOI: | 10.1016/j.ab.2017.03.006 |
| Popis: | A sensitive, rapid and label-free colorimetric aptasensor for sulfadimethoxine (SDM) detection was developed based on the tunable peroxidase-like activity of graphene/nickel@palladium nanoparticle (Gr/Ni@Pd) hybrids. The addition of the SDM aptamer could inhibit the peroxidase-like catalytic activity of the hybrids. However, the target SDM and aptamer could be triggered tightly and recover the catalytic activity of the Gr/Ni@Pd hybrids. Due to the peroxidase-like catalytic activity, Gr/Ni@Pd could catalyze the decomposition of H2O2 with releasing hydroxyl radicals which further oxidized reagent 3, 3', 5, 5'-Tetramethylbenzidine (TMB) to oxTMB accompanied with a colorless-to-blue color change. The original color change could be applied to obtain quantitative detection of SDM, due to the relationship between the concentration of the target and the color difference. As a result, this approach performed a linear response for SDM from 1 to 500 ng/mL with a limit detection of 0.7 ng/mL (S/N = 3) under the optimized conditions and realized the detection of SDM in spiked lake water samples. Therefore, this colorimetric aptasensor was an alternative assay for SDM detection in real water. Moreover, with its design principle, this work might be applied to detecting other small molecule by employing appropriate aptamer. |
| Databáze: | OpenAIRE |
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