Implantable Sensors Based on Gold Nanoparticles for Continuous Long-Term Concentration Monitoring in the Body

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Materials Science

Background:

• Implantable biosensors are crucial for monitoring diseases and treatment efficacy.
• Current limitations include short operational lifespan and difficulty adapting to various biomarkers.
• There is a need for robust, long-term biosensing solutions.

Purpose of the Study:

• To demonstrate a generalizable platform for long-term implanted biosensing using gold nanoparticles in a hydrogel.
• To assess the feasibility of noninvasive monitoring of drug concentrations in vivo.
• To overcome limitations of current biosensor technologies.

Main Methods:

• Development of a hydrogel matrix embedding gold nanoparticles for biosensing.
• Integration of aptamer receptors for analyte specificity.
• Utilizing optical imaging and a sensor/reference design for noninvasive interrogation.
• In vivo testing in anesthetized rats to measure kanamycin tissue concentration.

Main Results:

• Successful long-term implantation and noninvasive monitoring of kanamycin concentration.
• Demonstration of a tissue-integrating matrix with robust aptamer receptors and photostable gold nanoparticles.
• The platform showed potential for extended sensor lifetime.

Conclusions:

• The gold nanoparticle-based hydrogel platform offers a promising solution for long-term implanted biosensing.
• The technology is adaptable to different analytes, suggesting broad applications.
• Potential impact on personalized medicine and pharmaceutical development through versatile biosensing.