Citation: DENG Yan, MA Yu-Chan, WANG Min, GU Men-Qiao, CHI Kuan-Neng, HU Rong, YANG Yun-Hui. Ratio Type C-reactive Protein Immunosensor Based on Gold Nanoparticles/Fe-MIL-88-NH2[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(4): 498-506. doi: 10.19756/j.issn.0253-3820.191662
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A dual-signal proportional immunosensor for detection of C-reactive protein was developed using gold-nanoparticles (AuNPs) functionalized metal-organic frameworks (MOFs) material (AuNPs /Fe-MIL-88-NH2) as an immobilized matrix and signal unit. The octahedral Fe-MOFs can not only provide a larger effective surface area, but also increase the amount of immobilized biomolecules and promote the transport of electrons and ions, and also exhibit good electrical conductivity. Modification of AuNPs onto Fe-MOFs can further increase specific surface area to capture large amounts of antibodies and increase electron transfer capacity. With increase of CRP concentration, the oxidation peak current of K3Fe(CN)6/K4Fe(CN)6 decreases, while the oxidation peak current in Fe-MOFs is relatively constant. The response current ratio of K3Fe(CN)6/K4 Fe(CN)6 to Fe-MOFs has been used as a quantitative measurement of CRP response signal. Fe-MOFs modified by K3Fe(CN)6/K4Fe(CN)6 as a signal probe (K3Fe(CN)6/K4Fe(CN)6-sP) and AuNPs as internal reference probes (Fe-MOFs-rP). This ratio probe integrates sP and rP into one structure, ensuring identical modification conditions and the interdependence of sP and rP on a sensing interface. Therefore, this ratiometric probe has a stronger ability to eliminate environmental variation interference. The linear response of the immunosensor proposed here ranges from 1 to 200 ng/mL, and the detection limit is 0.3 ng/mL (S/N=3). The sensor has good selectivity and is expected to be used for early screening and diagnosis of cardiovascular disease. The method also lays the foundation for the preparation of other ratiometric signal amplification sensors for detecting biomarkers.
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