Abstract
We have developed a biosensor for the detection of live/viable bacteria based on the response of the conductive polymer 4-(3-pyrrolyl) butyric acid to glucose-induced metabolites. The polymer was electrochemically deposited and then functionalized with lectin through EDC/NHS chemistry to capture cells near the sensor surface and introduce selectivity for analytes. The addition of glucose to a three-electrode electrochemical cell containing 10 mM phosphate buffer and the bacteria-immobilized sensor produced an increase in the potential. When the bound bacteria were treated with antibiotics, the addition of glucose produced a notably reduced signal exhibiting the sensor’s potential to screen for the most effective antibiotic treatment. This biosensor having real-time responses, minimal sample preparation, and the ability to screen antibiotics demonstrates the speed, ease, and suitability essential for application in point-of-care services. The detection range was determined to be 6.0 × 103–9.2 × 107 CFU/mL.
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Acknowledgements
This work was supported in part by the National Science Foundation Grant 1842718 and W. Ruel Johnson Chair in Environmental Engineering to AM. We thank Dane Reano for his assistance in providing and harvesting MS2 and Tung Pham for help with the figures.
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Saucedo, N.M., Srinives, S. & Mulchandani, A. Electrochemical Biosensor for Rapid Detection of Viable Bacteria and Antibiotic Screening. J. Anal. Test. 3, 117–122 (2019). https://doi.org/10.1007/s41664-019-00091-2
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DOI: https://doi.org/10.1007/s41664-019-00091-2