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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

Published on: May 1, 2012

Granular Hydrogel Composites for Noninvasive Optical Biosensing.

Tyrell J Williams¹, Waqas Saleem¹, Sujeong Ahn¹

¹Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA.

Journal of Biomedical Materials Research. Part A

|July 2, 2026

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Researchers developed novel granular hydrogels for advanced biosensors. These hydrogels effectively integrate chemo-optical microdomains for real-time oxygen and glucose monitoring, showing promise for medical applications.

Area of Science:

Biomaterials Science
Chemical Engineering
Bioanalytical Chemistry

Background:

Granular hydrogels offer tunable properties and porosity, making them suitable for tissue engineering and regenerative medicine.
Integrating biosensors into biocompatible materials is crucial for advanced diagnostics and monitoring.
Chemo-optical microdomains provide sensitive detection of analytes like oxygen and glucose.

Purpose of the Study:

To develop and characterize a novel granular hydrogel platform for integrating chemo-optical biosensing microdomains.
To evaluate the performance of these granular hydrogels for oxygen and glucose detection.
To assess the biocompatibility and stability of the biosensing system.

Main Methods:

Fabrication of poly(ethylene glycol) (PEG) hydrogel microparticles using thiol-vinyl sulfone chemistry and batch emulsification.

Keywords:

biosensing glucose hydrogel microparticle oxygen

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Encapsulation of porphyrin-containing chemo-optical oxygen- and glucose-biosensing microdomains within PEG microparticles.

Annealing of microparticles with a PEG-tetra-thiol linker to form shear-thinning granular hydrogels.

Characterization of hydrogel porosity, crosslinking density, and mesh size.

In vitro testing of oxygen and glucose sensing capabilities and stability after sterilization.

Main Results:

The granular hydrogel system exhibited shear-thinning properties and tunable porosity (25.0% ± 6.6%).
Oxygen-sensing microdomains showed responsiveness across a wide oxygen range (0-21%) with a Stern-Volmer quenching constant of 0.0131 ± 0.0003 μM⁻¹.
Glucose-sensing microdomains demonstrated sensitivity (0.308 ± 0.068 μs·dL/mg) and a detection range spanning hypoglycemia to mild hyperglycemia (32.8 ± 18.0 to 180.9 ± 17.8 mg/dL).
Biosensing performance remained stable after electron-beam sterilization.

Conclusions:

Proof-of-concept for integrating chemo-optical biosensors into a granular hydrogel platform.
Demonstrated ability to measure physiologically relevant fluctuations in oxygen and glucose levels.
The developed granular hydrogels show potential for advanced, implantable biosensing applications.