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Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems
Published on: March 3, 2010
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Pd-porphyrin-cross-linked implantable hydrogels with oxygen-responsive phosphorescence
Haoyuan Huang1, Wentao Song, Guanying Chen
1Departments of Biomedical Engineering and Chemical and Biological Engineering, 210 Bonner Hall, University at Buffalo, Buffalo, NY, 14260, USA.
Advanced Healthcare Materials
|November 22, 2013
Summary
Researchers developed a novel luminescent biosensor for subcutaneous oxygen using palladium-porphyrins in a hydrogel matrix. This implantable sensor demonstrates long-term stability and accurate oxygen detection in vivo.
Area of Science:
- Biomedical Engineering
- Materials Science
- Optical Sensing
Background:
- Long-term implantable luminescent biosensors for subcutaneous oxygen are challenging due to matrix immobilization difficulties.
- Existing methods struggle with sensor aggregation and maintaining sufficient concentration for optical detection.
Purpose of the Study:
- To develop a stable, implantable luminescent biosensor for subcutaneous oxygen monitoring.
- To overcome challenges in matrix biocompatibility and prevent sensor aggregation.
- To enable transdermal optical detection of oxygen levels.
Main Methods:
- Utilized palladium-porphyrins as polyethylene glycol (PEG) cross-linkers to create a polyamide hydrogel.
- Achieved high porphyrin density (≈5 × 10(-3) M) within a 3D mesh structure to prevent dye aggregation.
- Developed a companion oxygen-non-responsive hydrogel using copper and free base porphyrins for ratiometric detection.
Main Results:
- The developed hydrogel exhibited oxygen-responsive phosphorescence.
- The biosensor was stably implanted subcutaneously in mice for weeks without degradation, bleaching, or host rejection.
- Intensity-matched luminescence was achieved for ratiometric detection using the companion hydrogel.
Conclusions:
- Palladium-porphyrin-based hydrogels offer a promising platform for implantable luminescent biosensors.
- The novel matrix design prevents aggregation and ensures long-term stability and biocompatibility.
- This technology facilitates reliable subcutaneous oxygen monitoring for extended periods.
