Electrochemical detection of pathogen infection using cell chip

Area of Science:

• Biomaterials Science
• Biosensors
• Analytical Chemistry

Background:

• Developing sensitive and rapid methods for pathogen detection is crucial for public health.
• Immobilized cell systems offer a promising platform for biosensing applications.
• Self-assembly techniques provide precise control over biomaterial fabrication.

Purpose of the Study:

• To develop a novel method for immobilizing HeLa cells on a gold substrate using synthetic oligopeptides.
• To investigate the feasibility of using this immobilized cell system for electrochemical detection of pathogen infection.
• To explore the potential of this approach for creating cell microarrays for on-site pathogen monitoring.

Main Methods:

• Fabrication of thin films using cysteine-terminated synthetic oligopeptides on a gold (Au) substrate.
• Characterization of layer formation and cell immobilization using surface plasmon resonance (SPR) and electrochemical impedance spectroscopy (EIS).
• Exposure of immobilized HeLa cells to E. coli O157:H7 to assess detection capabilities.

Main Results:

• Successful fabrication of thin films and immobilization of HeLa cells using the self-assembled synthetic oligopeptide.
• Demonstrated changes in SPR angle and electrochemical impedance signals upon exposure to E. coli O157:H7.
• Validation of the cell immobilization strategy for pathogen detection.

Conclusions:

• The self-assembled synthetic oligopeptide thin film is effective for HeLa cell immobilization.
• The immobilized cell system shows potential for electrochemical detection of pathogen infection.
• This method can be applied to construct cell microarrays for on-site pathogen monitoring.