Smart hydrogel based microsensing platform for continuous glucose monitoring

Area of Science:

• Biomedical Engineering
• Materials Science
• Sensor Technology

Background:

• Development of accurate glucose monitoring systems is crucial for diabetes management.
• Glucose-sensitive hydrogels offer potential for non-invasive glucose sensing applications.
• Integration of hydrogels into micro-pressure sensors requires evaluation of performance and biocompatibility.

Purpose of the Study:

• To investigate the response of glucose-sensitive hydrogels within micro-pressure sensors to varying glucose concentrations.
• To assess the sensor's response time in different physiological relevant solutions.
• To evaluate the preliminary biocompatibility and tissue response following subcutaneous implantation in a murine model.

Main Methods:

• Glucose-sensitive hydrogels were confined in micro-pressure sensors.
• Sensors were tested in phosphate-buffered saline (PBS) and bovine serum with glucose concentrations ranging from 20 to 0 mM.
• Subcutaneous implantation in mice was performed with EtO sterilized sensors, followed by tissue analysis after 55 days.

Main Results:

• The micro-sensors demonstrated a consistent response time of 10 minutes in both PBS and serum across tested glucose concentrations.
• Preliminary analysis of tissue surrounding the implanted sensors revealed inflammation.
• The observed inflammation is not anticipated to significantly impact sensor performance.

Conclusions:

• Glucose-sensitive hydrogel-based micro-pressure sensors show promising rapid response to glucose level variations.
• The sensors exhibit acceptable performance in biologically relevant media.
• Further investigation into long-term biocompatibility and mitigation of inflammatory responses is warranted.