期刊
ANALYTICA CHIMICA ACTA
卷 1265, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.aca.2023.341326
关键词
Electrochemical immunosensor; Molybdenum disulfide; Reduced graphene oxide; SARS-CoV-2 antibodies; RBD SARS-CoV-2 spike protein; Real samples
In this study, a straightforward and label-free electrochemical immunosensing strategy based on a glassy carbon electrode modified with a biocompatible and conducting biopolymer functionalized molybdenum disulfide-reduced graphene oxide (CS-MoS2/rGO) nanohybrid is proposed to investigate the SARS-CoV-2 virus. The immunosensor employs recombinant SARS-CoV-2 Spike RBD protein (rSP) to specifically identify antibodies against the SARS-CoV-2 virus. The results demonstrate that the immunosensor is capable of highly sensitive and specific detection of SARS-CoV-2 antibodies and can differentiate between positive and negative samples accurately.
Herein, we have proposed a straightforward and label-free electrochemical immunosensing strategy supported on a glassy carbon electrode (GCE) modified with a biocompatible and conducting biopolymer functionalized molybdenum disulfide-reduced graphene oxide (CS-MoS2/rGO) nanohybrid to investigate the SARS-CoV-2 virus. CS-MoS2/rGO nanohybrid-based immunosensor employs recombinant SARS-CoV-2 Spike RBD protein (rSP) that specifically identifies antibodies against the SARS-CoV-2 virus via differential pulse voltammetry (DPV). The antigen-antibody interaction diminishes the current responses of the immunosensor. The obtained results indi-cate that the fabricated immunosensor is extraordinarily capable of highly sensitive and specific detection of the corresponding SARS-CoV-2 antibodies with a LOD of 2.38 zg mL-1 in phosphate buffer saline (PBS) samples over a broad linear range between 10 zg mL-1-100 ng mL-1. In addition, the proposed immunosensor can detect attomolar concentrations in spiked human serum samples. The performance of this immunosensor is assessed using actual serum samples from COVID-19-infected patients. The proposed immunosensor can accurately and substantially differentiate between (+) positive and (-) negative samples. As a result, the nanohybrid can provide insight into the conception of Point-of-Care Testing (POCT) platforms for cutting-edge infectious disease diagnostic methods.
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