Journal
ELECTROANALYSIS
Volume 26, Issue 2, Pages 254-261Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201300479
Keywords
NT-proBNP; CRP; Amperometric magnetoimmunosensors; Dual screen-printed electrodes; Human serum
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Funding
- Spanish Ministerio de Economia y Competitividad Research Project [CTQ2012-34238]
- AVANSENS Program from the Comunidad de Madrid [S2009PPQ-1642]
- Spanish Ministry of Science and Innovation [120215-CAJAL4EU]
- ENIAC
- Spanish Ministerio de Ciencia e Innovacion
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A rapid magnetoimmunosensor for the simultaneous determination of two cardiac biomarkers, amino-terminal pro-B-type natriuretic peptide (NT-proBNP) and C-reactive protein (CRP), in human serum is described. Specific capture antibodies were covalently immobilized onto carboxylic acid-modified magnetic beads. The quantification of NT-proBNP and CRP was performed by using indirect competitive and sandwich configurations, respectively, and horseradish peroxidase-labeled tracers. The use of dual screen-printed carbon electrodes allowed the achievement of simultaneous independent amperometric readout for each cardiac biomarker. The developed methodology showed very low limits of detection (0.47ngmL(-1)). An international standard for CRP serum spiked with NT-proBNP was analyzed to evaluate the usefulness of the magnetoimmunosensor.
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