Related Experiment Video
Updated: Jun 24, 2026
13:21
Affordable Oxygen Microscopy-Assisted Biofabrication of Multicellular Spheroids
Published on: April 6, 2022
Fluorescent microparticles for sensing cell microenvironment oxygen levels within 3D scaffolds
Miguel A Acosta1, Patrick Ymele-Leki, Yordan V Kostov
1Department of Chemical and Biochemical Engineering, University of Maryland, Baltimore County, 1000 Hilltop Circle, ECS 314, Baltimore, MD 21250, USA.
Biomaterials
|March 17, 2009
Summary
We developed novel fluorescent microparticles for precise oxygen measurement in cell cultures and 3D scaffolds. This non-invasive technology accurately maps oxygen levels, aiding tissue engineering and cell biology research.
Area of Science:
- Biomedical Engineering
- Materials Science
- Cell Biology
Background:
- Accurate oxygen monitoring is crucial for understanding cellular processes in microenvironments.
- Existing methods for oxygen measurement in cell scaffolds can be invasive or lack spatial resolution.
- Developing microscale sensors is essential for studying localized oxygen gradients in engineered tissues.
Purpose of the Study:
- To develop and characterize fluorescent oxygen-sensing microparticles for microenvironmental oxygen measurement.
- To establish a rapid, automated, and non-invasive method for sensor analysis using fluorescence microscopy.
- To validate the microparticles' performance, including non-cytotoxicity, response range, and accuracy compared to traditional methods.
Main Methods:
- Synthesis of poly(dimethylsiloxane)-encapsulated silica gel microparticles containing oxygen-sensitive and reference fluorophores.
- Development of a fluorescence microscopy-based system for rapid, automated, and non-invasive sensor analysis.
- Calibration of the microparticles across a physiologically relevant range of oxygen concentrations (10-160 mmHg).
- Assessment of microparticle non-cytotoxicity and comparison with a dissolved oxygen meter.
Main Results:
- Successfully developed fluorescent microparticles (5-40 microm) for localized oxygen mapping.
- Demonstrated non-cytotoxicity and comparable performance to traditional dissolved oxygen meters.
- Established a calibration system enabling characterization of hypoxic to hyperoxic conditions relevant to cell biology.
- Achieved a high fraction of quenched luminophore (0.90+/-0.02), indicating enhanced sensor performance.
Conclusions:
- The developed fluorescent microparticles offer a versatile and non-invasive technology for measuring oxygen in microenvironments.
- This sensor system enables precise microscale mapping of oxygen concentration, correlating local oxygen levels with individual cell responses.
- The technology holds significant potential for advancing research in cell culture, engineered tissues, and cell and tissue biology.
