1. Temporal sensing platform based on anodic dissolution of Ag and cathodic biocatalysis of oxygen reduction for Staphylococcus aureus detection.
- Author
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Chen, Bin, Tao, Qin, Qiao, Fanglin, Fei, Yunjie, Liu, Yuanjian, Xiong, Xiaohui, and Liu, Songqin
- Subjects
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STAPHYLOCOCCUS aureus , *BIOCATALYSIS , *ELECTROLYTIC reduction , *OXYGEN reduction , *DETECTION limit , *LUMINOL , *ELECTROCHEMILUMINESCENCE - Abstract
• A temporal sensing platform of Staphylococcus aureus based on Ag@C hybrid BPE are established. • Anodic dissolution can improve sensitivity and extend the detection pattern to the time dimension. • The interference of food matrix can be ignored in this strategy. An Ag@C hybrid bipolar electrode (BPE) sensing platform has been established for the temporal detection of Staphylococcus aureus (S. aureus) in food. Combining the advantages of anodic dissolution of Ag and cathodic biocatalysis of oxygen (O 2) reduction, this strategy showed an ultralow detection limit down to 10 CFU mL−1. As the formation of Ag@C completely quenched the electrochemiluminescence (ECL) emission of luminol, the ECL emission recovery reflected the extent of anodic dissolution. Meanwhile, S. aureus catalyzed the electrochemical reduction of O 2 at the cathode, reducing the overpotential for cathodic O 2 reduction and thus increasing the rate of anodic electron loss, facilitating Ag dissolution and restoring the ECL emission of luminol. When a constant potential was applied, through monitoring the ECL recovery time before and after the incubation of S. aureus on the cathode, S. aureus could be quantified due to the slight difference of the conductivity. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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