Integrating potential-resolved electrochemiluminescence with molecularly imprinting immunoassay for simultaneous detection of dual acute myocardial infarction markers.

A novel potential-resolved molecularly imprinted electrochemical luminescence (ECL) immunosensor has been developed for the first time for the dual sensitive detection of markers of acute myocardial infarction (AMI): cardiac troponin I (cTnI) and myoglobin (Mb). In this work, cost-effective and robust molecularly imprinted polymer (MIP) as biomimetic antibody was used to construct the immunosensors through electropolymerization and elution to form polydopamine (PDA)-MIP modified electrode. In the presence of AMI biomarkers, two ECL probes including Ru(bpy) 3 2+@ MOCs and MoS 2 QDs functionalized by cTnI antibody and Mb aptamer could be specifically captured respectively. And two potential distinct ECL signals will be generated in one potential scan. The intensity of ECL reflects the concentrations of cTnI and Mb. The two ECL probes were characterized with field emission scanning electron microscopy, X-ray diffraction, FT-IR spectrum and UV–Vis diffuse reflectance spectroscopy. The prepared sensor exhibited a wide linear range (0.05–104 ng/mL) and a low detection limit (0.0184 ng/mL for cTnI and 0.0492 ng/mL for Mb). Additionally, the MIP-ECL sensor displayed excellent anti-interference, sensitivity and stability to detect cTnI and Mb. Therefore, it will be conducive to accelerate more precise and credible early diagnosis for AMI. • A novel potential-resolved ECL-MIP immunosensor has been developed for the first time to achieve the simultaneously sensitive detection of dual acute myocardial infarction (AMI) markers - cTnI and Mb. •Potential distinct ECL signals for double detection immunoassay are generated in one potential scan based on two ECL probes containing MoS 2 QDs/K 2 S 2 O 8 and Ru(bpy) 3 2+@MOCs/TPA system. •Molecularly imprinted polymer (MIP) as biomimetic antibody represents a cost-effective and robust alternative in immunoassays. •The as-constructed MIP-ECL immunosensor displays high sensitivity, excellent specificity, selectivity and stability. [ABSTRACT FROM AUTHOR]