期刊
BIOSENSORS-BASEL
卷 12, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/bios12100845
关键词
Escherichia coli; chronoamperometry; glassy carbon electrode; label-free quantitative detection; electrochemical biosensors
资金
- National Key R&D Program of China [2018YFD0800104]
- Special Fund of China [AWS18J004, 2019-JCJQ-JJ-163]
- Xi'anMunicipal Science and Technology Project [2022JH-RYFW-0023]
- Xi'an Polytechnic University Graduate Innovation Fund Project [CHX2020026]
This study presents a method based on chronoamperometry for the rapid and quantitative detection of live E. coli. The method shows good correlation between the electrochemical indicator signals and the concentration of E. coli, with a detection time of less than 5 minutes and a detection range of 10(4)-10(8) CFU/mL. The method also demonstrates good repeatability, stability, and sensitivity.
The rapid quantitative detection of Escherichia coli (E. coli) is of great significance for evaluating water and food safety. At present, the conventional bacteria detection methods cannot meet the requirements of rapid detection in water environments. Herein, we report a method based on chronoamperometry to rapidly and quantitatively detect live E. coli. In this study, the current indicator i(0) and the electricity indicator A were used to record the cumulative effect of bacteria on an unmodified glassy carbon electrode (GCE) surface during chronoamperometric detection. Through the analysis of influencing factors and morphological characterization, it was proved that the changes of the two set electrochemical indicator signals had a good correlation with the concentration of E. coli; detection time was less than 5 min, the detection range of E. coli was 10(4)-10(8) CFU/mL, and the error range was <30%. The results of parallel experiments and spiking experiments showed that this method had good repeatability, stability, and sensitivity. Humic acid and dead cells did not affect the detection results. This study not only developed a rapid quantitative detection method for E. coli in the laboratory, but also realized a bacterial detection scheme based on the theory of bacterial dissolution and adsorption for the first time, providing a new direction and theoretical basis for the development of electrochemical biosensors in the future.
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