Dynamic Range Expansion of the C-Reactive Protein Quantification with a Tandem Giant Magnetoresistance Biosensor
| Autor: | Lei Zhang, Fanda Meng, Jie Lian, Weisong Huo, Aldo Jesorka, Xi-Zeng Shi, Yunhua Gao |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ACS Omega ACS Omega, Vol 6, Iss 19, Pp 12923-12930 (2021) |
| ISSN: | 2470-1343 |
| DOI: | 10.1021/acsomega.1c01603 |
| Popis: | In this study, we report a convenient analytical method for a full-range quantification of the C-reactive protein (CRP), a blood biomarker of infection and cardiovascular events. We determine CRP over the entire diagnostically relevant concentration range in undiluted human blood serum in a single test, using a tandem giant magnetoresistance (GMR) sensor. The tandem principle combines a sandwich assay and a competitive assay, which allows for the discrimination of the concentration values resulting from the multivalued dose-response curve ("Hook" effect), which characterizes the one-step sandwich assay at high CRP concentrations. The sensor covers a linear detection range for CRP concentration from 3 ng/mL to 350 μg/mL, the detection limit (s/n = 3) is 1 ng/mL. The prominent features of the chip-based method are its expanded dynamic range and low sample volume (50 μL), and the need for a short measurement time of 15 min. These figures of merit, in addition to the low detection limit equal to the established assay instrumentation, make it a viable candidate for use in point-of-care diagnostics. |
| Databáze: | OpenAIRE |
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