Abstract
The focus of this study is the application of modified gold nanoparticles (AuNPs) for improvement of the analytical characteristics of DNA hybridization biosensors based on surface plasmon resonance (SPR) spectrometry. It was shown that the use of citrate-capped AuNPs in a biosensor assay leads to uncontrolled aggregation of AuNPs on the gold sensor surface, which is reflected in a significant increase in the SPR sensor response. This nonspecific sensor response significantly worsens the selectivity and specificity of detection of such a SPR biosensor. Therefore, in this study, 6-mercapto-1-hexanol and lipoic acid were used to modify the surface of AuNPs in order to improve their colloidal stability under chemical conditions facilitating DNA hybridization. The optimal concentration of these stabilizing molecules in order to minimize their aggregation on the gold plate of the SPR biosensor was determined. DNA biosensors functioning with the use of modified AuNPs were characterized by better sensitivity than that of a traditional DNA biosensor. As a result of this study, an optimal method of functionalizing AuNPs with oligonucleotides and stabilizing ligands was proposed for their further use to improve the analytical characteristics of DNA hybridization biosensors.
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The work was carried out thanks to financial support from the National Research Foundation of Ukraine in the framework of the competition of projects for research and development “Support of research of leading and young scientists” (project 2020.02/0097).
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Sobolevskyi, M.S., Soldatkin, O.O., Lopatynskyi, A.M. et al. Application of modified gold nanoparticles to improve characteristics of DNA hybridization biosensor based on surface plasmon resonance spectrometry. Appl Nanosci 13, 7521–7529 (2023). https://doi.org/10.1007/s13204-023-02930-2
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DOI: https://doi.org/10.1007/s13204-023-02930-2