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An electrochemiluminescence immunosensor based on multipath signal catalytic amplification integrated in a Cu2+–PEI–Pt/AuNC nanocomposite
Here, the nanocomposite Cu2+–PEI–Pt/AuNCs with multipath signal catalytic amplification for a peroxydisulfate–dissolved oxygen electrochemiluminescence (ECL) system was prepared to fabricate a sensitive ECL immunosensor. Using polyethyleneimine (PEI), a linear polymer, as the reductant and template,...
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Published in: | Analyst (London) 2023-07, Vol.148 (14), p.3354-3358 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | Here, the nanocomposite Cu2+–PEI–Pt/AuNCs with multipath signal catalytic amplification for a peroxydisulfate–dissolved oxygen electrochemiluminescence (ECL) system was prepared to fabricate a sensitive ECL immunosensor. Using polyethyleneimine (PEI), a linear polymer, as the reductant and template, Pt/Au nanochains (Pt/AuNCs) were prepared. Abundant PEI would adsorb on the surface of Pt/AuNCs via Pt–N or Au–N bonds, and further coordinate with Cu2+ to give the final nanocomposite Cu2+–PEI–Pt/AuNCs which possessed multipath signal catalytic amplification for the ECL of the peroxydisulfate–dissolved oxygen system in the presence of H2O2. First, PEI, as an effective co-reactant, could directly enhance the ECL intensity. Second, Pt/AuNCs could not only act as a mimicking enzyme to promote the decomposition of H2O2 to produce more oxygen in situ, but also act as an effective co-reaction accelerator to facilitate the generation of more co-reactive intermediate groups from peroxydisulfate, resulting in an obviously enhanced ECL signal. Then, Cu2+ could also accelerate the decomposition of H2O2 to produce more oxygen in situ, leading to a further improvement of the ECL response. Using Cu2+–PEI–Pt/AuNCs as a loading platform, a sandwiched ECL immunosensor was fabricated. As a result, the obtained ECL immunosensor possessed an ultra-sensitive detection performance for α-1-fetoprotein, providing effective information on the diagnosis and treatment of related diseases. |
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ISSN: | 0003-2654 1364-5528 |
DOI: | 10.1039/d3an00721a |