Abstract
A novel ternary Y-DNA walker amplification strategy designed fluorescence aptasensor based on Au@SiO2@Fe3O4 nanomaterials for ultrasensitive and specific ochratoxin A detection in food samples is presented. Au@SiO2@Fe3O4 nanomaterials provide the loading platform as well as separation and recovery properties for the ternary Y-DNA walker. The ternary Y-DNA walker is designed to be driven by Nb.BbvCI cleaving a large number of FAM probes to achieve signal amplification. Since Ochratoxin A (OTA) can bind to the constituent aptamer in the ternary Y-DNA walker, adding OTA will destroy the structure of the ternary Y-DNA walker, thereby inhibiting the driving process of the walker. After optimization of various parameters, a standard curve was obtained from 100 to 0.05 ng·mL−1 of OTA with the limit of determination of 0.027 ng·mL−1. The spiked recovery of peanut samples by this method was 82.00–93.30%, and the aptasensor showed excellent specificity and long-term stability. This simple, robust, and scalable oligonucleotide chain-based ternary Y-DNA walker can provide a general signal amplification strategy for trace analysis.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- OTA:
-
Ochratoxin A
- CONTAM:
-
Contaminants in the Food Chain
- BMDL10 :
-
Benchmark dose limit
- ssDNA:
-
Single-stranded DNA
- Au@SiO2@Fe3O4 :
-
Iron oxide and silica core–shell loaded gold nanoparticles composites
- FAM:
-
Carboxyfluorescein
- Apt:
-
Aptamer
- ZEN:
-
Zearalenone
- DON:
-
Deoxynivalenol
- AFB1 :
-
Aflatoxin B1
- FB1 :
-
Fumonisin B1
- PAA:
-
Poly (acrylic acid)
- Tris-base:
-
Tris(hydroxymethyl)aminomethane
- TEOS:
-
Tetraethyl orthosilicate
- TCEP:
-
Tris(hydroxymethyl) aminomethane phosphine hydrochloride solution
- PEI:
-
Polyethylenimine
- TEM:
-
Transmission electron microscope
- SEM:
-
Scanning electron microscopy
- XRD:
-
X-ray diffractometer
- RSD:
-
Relative standard deviations
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Acknowledgements
This work has been supported by National Key Research and Development Program of China (2021YFE0101800); National Natural Science Fund of China (NSFC 31871881), Jiangsu Planned Projects for Postdoctoral Research Funds (1601087B), Young Elite Scientists Sponsorship Program by CAST (2017QNRC001) and the National First-class Discipline Program of Food Science and Technology (JUFSTR20180303).
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Dong, X., Qi, S., Qin, M. et al. A novel ternary Y-DNA walker amplification strategy designed fluorescence aptasensor based on Au@SiO2@Fe3O4 nanomaterials for ochratoxin A detection. Microchim Acta 190, 443 (2023). https://doi.org/10.1007/s00604-023-06018-0
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DOI: https://doi.org/10.1007/s00604-023-06018-0