Abstract
Vitamin D3 (VD3) is the main form of vitamin D and an essential nutrient for maintaining human life. Currently, traditional methods for detecting 25-hydroxyvitamin D3(25(OH)D3) are complex and expensive. In this study, we constructed an accurate, sensitive, simple, and cost-effective label-free biosensor based on an aptamer for the detection of 25(OH)D3. The aptamer-modified sulfhydryl adopted self-assembly as a way to stably immobilize at the glassy carbon electrode (GCE) surface modified by gold nanoparticles (AuNPs). Upon 25(OH)D3 binding to the aptamer, the complexes inhibit electron transfer at the electrode surface, leading to reduced [Fe(CN)6]3−/4− redox peak current. Consequently, the quantity of 25(OH)D3 that interacts with the electrode-bound aptamer correlates with the observed electric current response values. The Aptamer/AuNPs/GCE aptasensor achieved direct and highly sensitive detection of 25(OH)D3 over a wide concentration range (1.0–1000 nM), with a limit of detection of 1.0 nM. At the same time, other molecules with a similar structure, such as 25(OH)D2, Vitamin D3, and Vitamin D2, had lower response interference than 25(OH)D3. Therefore, this biosensor has great potential to become a portable diagnostic device for 25(OH)D3.
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Acknowledgements
This work was supported by the Graduate school-enterprise joint innovation Project of Central South University (No. 2022XQLH074, 2022XQLH075, and 2022XQLH076) and the Natural Science Foundation of Hunan Province (No. 2022JJ80105).
Funding
Innovation-Driven Project of Central South University, 2022XQLH074, Zheng Wei, 2022XQLH075, Meilun Chen,2022XQLH076, Xiaoling Lu, Natural Science Foundation of Hunan Province, 2022JJ80105, Peng Yu.
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TC designed and guided the project. MC wrote the manuscript. XL developed the method of electrodeposition. ZW made electrodes. CT and JY characterized the aptamer. YH assisted in revising the manuscript. JZ provided methodological advice. PY provided financial support.
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Cai, T., Chen, M., Yang, J. et al. An AuNPs-based electrochemical aptasensor for the detection of 25-hydroxy vitamin D3. ANAL. SCI. 40, 599–607 (2024). https://doi.org/10.1007/s44211-023-00489-0
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DOI: https://doi.org/10.1007/s44211-023-00489-0