Skip to main content
Log in

Polymer coating of paramagnetic particulates for in vivo oxygen-sensing applications

  • Published:
Biomedical Microdevices Aims and scope Submit manuscript

Abstract

Crystalline lithium phthalocyanine (LiPc) can be used to sense oxygen. To enhance biocompatibility/stability of LiPc, we encapsulated LiPc in Teflon AF (TAF), cellulose acetate (CA), and polyvinyl acetate (PVAc) (TAF, previously used to encapsulate LiPc, was a comparator). We identified water-miscible solvents that don’t dissolve LiPc crystals, but are solvents for the polymers, and encapsulated crystals by solvent evaporation. Oxygen sensitivity of films was characterized in vitro and in vivo. Encapsulation did not change LiPc oximetry properties in vitro at anoxic conditions or varying partial pressures of oxygen (pO2). EPR linewidth of encapsulated particles was linear with pO2, responding to pO2 changes quickly and reproducibly for dynamic measurements. Encapsulated LiPc was unaffected by biological oxidoreductants, stable in vivo for four weeks. Oximetry, stability and biocompatibility properties of LiPc films were comparable, but both CA and PVAc films are cheaper, and easier to fabricate and handle than TAF films, making them superior.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5

Similar content being viewed by others

References

Download references

Acknowledgement

The study was supported by NIH grant EB 004031.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Stephen C. Lee.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Eteshola, E., Pandian, R.P., Lee, S.C. et al. Polymer coating of paramagnetic particulates for in vivo oxygen-sensing applications. Biomed Microdevices 11, 379–387 (2009). https://doi.org/10.1007/s10544-008-9244-x

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10544-008-9244-x

Keywords

Navigation