Abstract
A substantial outstanding challenge in diagnostics and disease monitoring is the ability to assay rapidly and conveniently for protein biomarkers within complex biological media. Bi2Se3, as an important topological insulator (TI) material, was synthesized by a solvothermal method and characterized structurally. Subsequently, the composite of Bi2Se3 and ionic liquid ([BMIm]BF4 IL) was used as a sensing interface to cross-link goat anti-human immunoglobulin G (anti-IgG) via glutaraldehyde (GA) to fabricate an Bi2Se3/IL/GA/anti-IgG-carbon paste electrode (CPE). The nonspecific binding sites were enclosed with bovine serum albumin (BSA) to develop a label-free IgG immunosensor. The result showed that the proposed label-free IgG immunosensor exhibited high specificity with a detection limit of 0.8 ng mL−1 and linear range from 2 to 300, and 300 to 2200 ng mL−1. Besides, the immunosensor exhibited high specificity for IgG detection, acceptable reproducibility, and stability. Thus, the strategy reported here paved a simple way to design a sensitive and cost-effective sensing platform for extension to other disease biomarkers.
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The authors appreciate the support from the National Natural Science Foundation of China (No. 21575111) and the Projects in the National Science & Technology (No. 2012BAC04B02).
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Dong, S., Li, M., Wei, W. et al. An convenient strategy for IgG electrochemical immunosensor: the platform of topological insulator materials Bi2Se3 and ionic liquid. J Solid State Electrochem 21, 793–801 (2017). https://doi.org/10.1007/s10008-016-3420-3
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DOI: https://doi.org/10.1007/s10008-016-3420-3