Abstract
Pathogenic bacteria can cause the outbreaks of disease and threaten human health, which stimulates the development of advanced detection techniques. Herein, a specific and sensitive electrochemical biosensor for Gram-negative bacteria was established based on the conductive polymer with artificial muscle properties. The effective recognition was achieved through the specific carbohydrate-carbohydrate interaction between gluconamide and lipopolysaccharide. The application of impulse voltage enhances the efficiency of recognition and shortens the detection time through the temporary deformation of the electrode surface, with a limit of detection (LOD) of 1 × 100 CFU/mL and a linear range of 1 × 100 − 1 × 106 CFU/mL for Escherichia coli (E. coli). In addition to the merits of low cost, high efficiency, and rapidity, the developed label-free electrochemical biosensor can also be applicable for other Gram-negative bacteria, owning promising potential in the application of portable devices and paving a potential way for the construction of electrochemical biosensors.
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Acknowledgements
Special thanks are due to the instrument or data analysis from Analytical and Testing Center, Northeastern University.
Funding
This work was supported by the National Natural Science Foundation of China (No. 21775016, 21874013, and 22074013), the Fundamental Research Funds for the Central Universities (N2005027, N2105018, N180504006), and Talent Project of Revitalizing Liaoning (XLYC1807165).
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Supplementary file1 (DOCX 4413 kb) Additional information about SEM spectra, LSCFM images, Water contact angle images, Zeta potential, EIS and CV plots, and optimization of experimental conditions were listed in supporting information.
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Ren, S., Zhang, X., Li, Z. et al. Development of a pulse-induced electrochemical biosensor based on gluconamide for Gram-negative bacteria detection. Microchim Acta 188, 399 (2021). https://doi.org/10.1007/s00604-021-05073-9
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DOI: https://doi.org/10.1007/s00604-021-05073-9