A general method to regenerate arrayed gold microelectrodes for label-free cell assay.

Area of Science:

• Biomedical Engineering
• Electrochemistry
• Cell Biology

Background:

• Label-free cell analysis relies on sensitive microelectrode detection.
• Repeated use of microelectrodes is crucial for cost-effective research.
• Current regeneration methods for gold microelectrodes can be inefficient.

Purpose of the Study:

• To develop and validate an efficient method for regenerating arrayed gold microelectrodes.
• To assess the reusability of regenerated microelectrodes for cell analysis.
• To evaluate the performance of regenerated electrodes in drug cytotoxicity assays.

Main Methods:

• Developed a regeneration protocol involving trypsin digestion, ethanol and deionized water rinsing, and spinning.
• Utilized a commercial label-free cell analyzer equipped with arrayed gold microelectrodes.
• Performed real-time electric impedance measurements to assess anti-cancer drug cytotoxicity.

Main Results:

• The proposed method achieved complete regeneration of gold microelectrodes.
• Regenerated gold microchips were successfully reused up to 4 times.
• Consistent and reliable measurements of anti-cancer drug cytotoxicity were obtained using regenerated electrodes.

Conclusions:

• The developed regeneration method is effective for arrayed gold microelectrodes.
• This technique significantly enhances the reusability of microchips for label-free cell analysis.
• The method provides a cost-effective solution for repeated drug cytotoxicity testing.