Abstract
A self-assembled nanozyme of iron porphyrin mediated supramolecular modified gold nanoparticles (FpA) was fabricated to determine nitrated alpha-synuclein as the Tyr 39 residue (nT39 α-Syn) of a potential biomarker for early diagnosis of Parkinson’s disease (PD). Mechanically, localized surface plasmon resonance (LSPR) and the mass effect caused by catalytic deposition of the nanozyme contributed to a cascade signal amplification strategy. The sensor allowed a signal amplification and selective nT39 α-Syn bioanalysis with a 1.34-fold enhancement by cascade amplified SPR signal and double specific recognition. The detection limit was 1.78 ng/mL in the detection range of 7–240 ng/mL. Benefiting from the excellent immunosensor, this method can distinguish healthy people and PD patients using actual samples. Overall, this strategy provides a nanozyme-based biosensing platform for the early diagnosis of PD and can be applied to detect other protein biomarkers, such as PD-L1.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (grant no. 62005156 and 61875114).
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Xiaojun Hu: Conceptualization, formal analysis, and writing—original draft. Ruhui Hu: Formal analysis, validation, and writing—review and editing. Han Zhu: Formal analysis, validation, and writing—original draft. Qiang Chen: Validation, writing—original draft. Yongkai Lu: Formal analysis, writing—review and editing. Jie Chen: Data curation and writing–review and editing. Yawen Liu: Data curation and writing—review and editing. Hongxia Chen: Conceptualization, project administration, and funding acquisition.
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Hu, X., Hu, R., Zhu, H. et al. Nanozyme-based cascade SPR signal amplification for immunosensing of nitrated alpha-synuclein. Microchim Acta 189, 367 (2022). https://doi.org/10.1007/s00604-022-05465-5
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DOI: https://doi.org/10.1007/s00604-022-05465-5