Amperometric magnetoimmunoassay for the direct detection of tumor necrosis factor alpha biomarker in human serum |
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Authors: | U Eletxigerra J Martinez-Perdiguero S Merino R Villalonga JM Pingarrón S Campuzano |
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Institution: | 1. Micro-NanoFabrication Unit, IK4-Tekniker, Eibar, Spain;2. CIC microGUNE, Arrasate-Mondragón, Spain;3. Departamento de Química Analítica, Facultad de CC. Químicas, Universidad Complutense de Madrid, Madrid, Spain |
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Abstract: | An amperometric immunoassay for the determination of tumor necrosis factor alpha (TNFα) protein biomarker in human serum based on the use of magnetic microbeads (MBs) and disposable screen-printed carbon electrodes (SPCEs) has been developed. The specifically modified microbeads were magnetically captured on the working electrode surface and the amperometric responses were measured at −0.20 V (vs. Ag pseudo-reference electrode), upon addition of hydroquinone (HQ) as electron transfer mediator and H2O2 as the enzyme substrate. After a thorough optimization of the assay, extremely low limits of detection were achieved: 2.0 pg mL−1 (36 fM) and 5.8 pg mL−1 (105 fM) for standard solutions and spiked human serum, respectively. The simplicity, robustness and this clinically interesting LOD proved the developed TNFα immunoassay as a good contender for real clinical application. |
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Keywords: | Electrochemical Human serum Immunoassay Magnetic beads Tumor necrosis factor alpha |
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