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Gold nanoparticles-reduced graphene oxide based electrochemical immunosensor for the cardiac biomarker myoglobin

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Abstract

A composite consisting of gold nanoparticles and reduced graphene oxide (AuNPs@rGO) was electrochemically prepared in-situ on a screen printed electrode (SPE) which then was used as an immunosensor for the cardiac biomarker myoglobin. The nanocomposite was characterized by transmission electron microscopy (TEM, scanning electron microscopy (SEM), atomic force microscopy, FTIR and electrochemical impedance spectroscopy. For FTIR, TEM and SEM, the deposition was done on indium tin oxide coated glass plates. The immunosensor was obtained by immobilization of in-house generated antibody against cardiac myoglobin on the electrode surface. The immunosensing response was monitored using differential pulse voltammetry, which showed a reduction peak at ~ −0.5 V (vs. Ag/AgCl). The reduction peak arises from the reduction of iron moiety present in the heme group of myoglobin. The immunosensor exhibited dynamic linearity range from 1 ng.mL−1 to 1400 ng.mL−1 with the detection limit of ~0.67 ng.mL−1 for cardiac myoglobin. The obtained result was almost eight times better (in terms of detection limit) than that obtained with ELISA tests (with detection limit of ~4 ng.mL−1) using the same antibodies. The immunosensor was applied to analyze spiked serum samples also.

The study reports on gold nanoparticle-reduced graphene oxide (AuNPs@rGO) composite based immunosensor for the cardiac biomarker myoglobin. The composite has been synthesized electrochemically in which auric acid and graphene oxide are simultaneously reduced on screen printed electrodes. The immunosensor is sensitive in the range from 1 to 1400 ng.mL−1.

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Acknowledgments

S.K.T. is thankful to Council of Scientific and Industrial Research (CSIR), New Delhi, India, for granting Senior Research Fellowship. The financial support from CSIR under XIIth five year plan in network projects ‘BIOCERAM’– ESC 0103 is acknowledged.

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Authors and Affiliations

  1. CSIR-Central Scientific Instruments Organisation (CSIO), Chandigarh, 160030, India

    Suman Singh, Satish K. Tuteja, Devendra Sillu & Akash Deep

  2. Academy of Innovative and Scientific Research (AcSIR)-CSIO, Chandigarh, 160030, India

    Suman Singh, Satish K. Tuteja & Akash Deep

  3. CSIR-Institute of Microbial Technology (IMTECH), Chandigarh, 160036, India

    C. Raman Suri

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  1. Suman Singh
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  2. Satish K. Tuteja
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  3. Devendra Sillu
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  4. Akash Deep
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  5. C. Raman Suri
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Correspondence to Suman Singh.

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The author(s) declare that they have no competing interests.

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Suman Singh and Satish K. Tuteja contributed equally to this paper.

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Singh, S., Tuteja, S.K., Sillu, D. et al. Gold nanoparticles-reduced graphene oxide based electrochemical immunosensor for the cardiac biomarker myoglobin. Microchim Acta 183, 1729–1738 (2016). https://doi.org/10.1007/s00604-016-1803-x

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  • DOI: https://doi.org/10.1007/s00604-016-1803-x

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