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Electrochemical impedimetric immunosensor based on stabilized lipid bilayer–tethered WS2@MWCNT for the sensitive detection of carcinoembryonic antigen

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Abstract

An innovative and ultrasensitive electrochemical impedimetric immunosensor was developed for the quantitative detection towards carcinoembryonic antigen (CEA). CEA is a widely utilized tumour biomarker that is generated in a wide variety of cancers and it is a frequently used biomarker for clinical research and early detection of cancer. Novelty of the present work is the utilization of biomimetic membrane comprising gold nanoparticle–stabilized lipid bilayer (SLB) containing DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine) and DOTAP (N-[1-(2,3-Dioleoyloxy)propyl]-N,N,N-trimethyl ammonium Propane) for easy protein insertion, bio-affinity, and bio-functionalization towards the detection of CEA. The SLB is tethered on stable tungsten disulfide decorated MWCNT (WS2@MWCNT) surface for the sensitive and selective detection of CEA. The WS2@MWCNT surface has been chosen to tether SLB due to its numerous unique characteristics such as greater surface area, high conductivity, and excellent electronic conductivity, which in turn leads to the improvement of the superior electrochemical sensing ability towards CEA. The lone SLB when used for protein insertion lacks space and impedes the functional incorporation of transmembrane proteins with hydrophilic domains on both sides and biosensing applications. The SLB-tethered WS2@MWCNT surface (SLB-WS2@MWCNT) was examined by studying the electrochemical changes in the existence of redox probe K3/K4 [Fe(CN)6] through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The combined excellent properties of WS2@MWCNT and SLB have shown to amplify the sensitive detection of CEA with a LOD value of 0.2 pg mL−1. The developed sensor provides higher stability, sensitivity, and excellent reproducibility towards the detection of CEA with relative standard deviation (RSD) of < 5%. The encouraging results demonstrate that the CEA impedimetric immunosensor has potential in practical analysis and lays a solid platform for additional biomarker detection in early clinical diagnosis.

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Acknowledgements

The authors sincerely thank DST-FIST, UGC-SAP, and DST-PURSE, Government of India, for their necessary instrumental facilities accessible in their department.

Funding

Dr. N. Ponpandian and SK received grants from UGC-DAE CSR (CSR-KN/CRS- 111/2018–19/1050), Indore and Kalpakkam Node through collaborative research project. KPD, AR, and NP received grants from Rashtriya Uchattar Shiksha Abhiyan (RUSA-BCTRC), Bharathiar University, Coimbatore 641 046, India.

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Authors and Affiliations

  1. Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, India

    S. Keerthana, K. P. Divya, A. Rajapriya, C. Viswanathan & N. Ponpandian

  2. Bharathiar Cancer Theranostics Research Centre, Bharathiar University, Coimbatore, 641 046, India

    K. P. Divya

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Keerthana, S., Divya, K.P., Rajapriya, A. et al. Electrochemical impedimetric immunosensor based on stabilized lipid bilayer–tethered WS2@MWCNT for the sensitive detection of carcinoembryonic antigen. Microchim Acta 189, 450 (2022). https://doi.org/10.1007/s00604-022-05557-2

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