Faradaic Fenton Pixel: Reactive Oxygen Species Delivery Using Au/Cr Electrochemistry

Area of Science:

• Biomedical Engineering
• Electrochemistry
• Materials Science

Background:

• Reactive oxygen species (ROS) are crucial in various anticancer therapies.
• Fenton-like reactions, utilizing peroxides and transition metals, are potent ROS-generating methods.
• Precise control over Fenton reaction dosing is a significant challenge in therapeutic applications.

Purpose of the Study:

• To introduce an electrochemical faradaic pixel for controlled ROS production via a Fenton-like process.
• To demonstrate the on-demand generation of ROS for potential therapeutic applications.
• To establish a scalable concept for delivering redox-active products to influence physiological outcomes.

Main Methods:

• Fabrication of an electrochemical pixel with a cathode for hydrogen peroxide generation and a chromium anode.
• Electrochemical corrosion of chromium to produce chromium ions.
• In vitro testing of the faradaic pixel with a cancer cell line to assess ROS generation and efficacy.

Main Results:

• The electrochemical pixel successfully generated controlled amounts of ROS through a Fenton-like process.
• The interaction of hydrogen peroxide and chromium ions produced hydroxyl radicals and hexavalent chromium.
• Demonstrated efficacy of the device under in vitro conditions using a cancer cell line.

Conclusions:

• The electrochemical faradaic pixel is a viable and scalable platform for on-demand ROS generation.
• This technology enables precise delivery of redox-active species for controlling physiological responses.
• The concept holds promise for novel therapeutic strategies, particularly in cancer treatment.