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Published on: October 7, 2016
Preliminary characterization of a glucose-sensitive hydrogel
Brooke L Beier1, Eric M Brandner, Katherine M Musick
1Brain Computer Interface Laboratory and the Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA. bbeier@purdue.edu
Summary
This study shows a glucose-sensitive hydrogel could work as a continuous glucose sensor. The hydrogel swells more in high glucose, affecting molecule movement for potential glucose monitoring.
Area of Science:
- Biomaterials Science
- Sensor Technology
- Biomedical Engineering
Background:
- Continuous glucose monitoring is crucial for diabetes management.
- Existing sensors face challenges with accuracy and invasiveness.
- Hydrogels offer tunable properties for biosensing applications.
Purpose of the Study:
- To evaluate a glucose-sensitive hydrogel as a potential continuous glucose sensor.
- To characterize hydrogel swelling and molecule diffusion under varying glucose concentrations.
Main Methods:
- Characterized hydrogel equilibrium swelling ratio at normal and hyperglycemic glucose levels.
- Measured fluorescein isothiocyanate (FITC) diffusivity using fluorescence recovery after photobleaching (FRAP).
- Determined hydrogel permeability after equilibration in hyperglycemic conditions.
Main Results:
- Hydrogel exhibited a higher equilibrium swelling ratio in hyperglycemic conditions compared to normal glucose.
- FITC diffusivity through hyperglycemic hydrogel was 4.2 × 10(-14) m(2)/s, significantly lower than in solution.
- Hydrogel permeability was measured at 5.1 × 10(-17) m(2), comparable to agarose gels.
Conclusions:
- The glucose-sensitive hydrogel demonstrates potential for continuous glucose sensing.
- Changes in hydrogel swelling and molecule diffusion correlate with glucose levels.
- Further development could lead to novel non-invasive glucose monitoring devices.
