Development of a thin membrane glucose sensor using beta-type crystalline chitin for implantable biosensor

Area of Science:

• Biomaterials Science
• Biosensor Technology
• Biocompatible Materials

Background:

• Development of implantable biosensors is crucial for continuous monitoring of physiological parameters.
• Chitin, a natural polymer, offers biocompatibility and potential for biosensor fabrication.
• Existing glucose sensors face challenges in long-term stability and biocompatibility for implantation.

Purpose of the Study:

• To develop a biocompatible thin membrane glucose sensor using beta-crystalline chitin for implantable applications.
• To evaluate the sensor's performance, including response time and measuring range.
• To assess the sensor's suitability for implantation by studying its sterilization and toxicity.

Main Methods:

• Fabrication of a glucose sensor using beta-chitin membrane as a supporting material.
• Immobilization of glucose oxidase onto the beta-chitin membrane.
• Formation of a gold electrode via vapor deposition.
• Evaluation of sensor response to glucose and hydrogen peroxide (H2O2).
• Sterilization using ethylene oxide and toxicity assessment using mouse fibroblast cells.

Main Results:

• The developed beta-chitin glucose sensor exhibited rapid response times to glucose and H2O2 (< 45 seconds).
• Incorporation of 2,6-dichlorophenolindophenol as a mediator expanded the sensor's measuring range.
• Ethylene oxide sterilization was effective, with minimal impact on sensor activity for body fluid measurements.
• Toxicity assays using mouse fibroblast cells indicated no significant toxicity for the beta-chitin sensor.

Conclusions:

• A biocompatible and responsive glucose sensor has been successfully developed using beta-chitin.
• The beta-chitin based glucose sensor is a promising candidate for implantable biosensor applications.
• The sensor's biocompatibility and effective sterilization support its potential use in medical devices for continuous glucose monitoring.