A Visual Hydrogen Sensor Prototype for Monitoring Magnesium Implant Biodegradation.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Medical Diagnostics

Background:

• Magnesium (Mg) alloys are promising for temporary implants due to biodegradability.
• Current methods for monitoring Mg implant biodegradation are invasive, complex, or costly.
• There is a critical need for real-time, point-of-care monitoring solutions.

Purpose of the Study:

• To develop a novel, thin, and wearable visual hydrogen (H2) sensor prototype.
• To enable noninvasive monitoring of in vivo Mg-implant biodegradation.
• To achieve a fast response time for medical research and clinical applications.

Main Methods:

• A hydrogel matrix (agarose/alginate) incorporating resazurin and bimetallic gold-palladium nanoparticles (Au-Pd NPs) was fabricated.
• The sensor utilizes the irreversible redox reaction of H2 with resazurin, catalyzed by Au-Pd NPs, causing a color change from blue to pink.
• ImageJ software and smartphone photography were used to quantify sensor color changes and H2 concentrations.

Main Results:

• The developed sensor prototype demonstrated a rapid color change from blue to pink upon exposure to H2.
• The sensor detected H2 across a range from pure H2 down to limits of detection of 6 and 8 μM.
• The sensor's performance is adequate for monitoring in vivo Mg-alloy implant biodegradation in research and clinical settings.

Conclusions:

• A novel, wearable visual H2 sensor prototype for noninvasive monitoring of Mg-implant biodegradation has been successfully developed.
• This sensor offers a fast, accessible, and potentially cost-effective alternative to current monitoring methods.
• The technology holds promise for advancing the clinical application and research of biodegradable Mg implants.