Nano Archive

An implantable Teflon chip holding lithium naphthalocyanine microcrystals for secure, safe, and repeated measurements of pO2 in tissues

Pandian, Ramasamy P. and Meenakshisundaram, Guruguhan and Bratasz, Anna and Eteshola, Edward and Lee, Stephen C. and Kuppusamy, Periannan (2010) An implantable Teflon chip holding lithium naphthalocyanine microcrystals for secure, safe, and repeated measurements of pO2 in tissues. Biomedical Microdevices, 12 (3). pp. 381-387.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://www.springerlink.com/content/1um27021000hj3...

Abstract

Lithium naphthalocyanine (LiNc) is a crystalline material that has significant potential as a probe for EPR (electron paramagnetic resonance)-based biological oximetry (Pandian et al. J. Mater. Chem. 19:4138–4147, 2009a). However, implantation of LiNc crystals in tissues in raw or neat form is undesirable since dispersion of crystals in tissue may lead to loss of EPR signal, while also exacerbating biocompatibility concerns due to tissue exposure. To overcome these concerns, we have encapsulated LiNc crystals in an oxygen-permeable polymer, Teflon AF 2400 (TAF). Fabrication of TAF films incorporating LiNc particles (denoted as LiNc:TAF chip) was carried out using solvent-evaporation techniques. The EPR linewidth of LiNc:TAF chip was linearly dependent on oxygen-partial pressure (pO2) and did not change significantly relative to neat LiNc crystals. LiNc:TAF chip responded to changes in pO2 reproducibly, enabling dynamic measurements of oxygenation in real time. The LiNc:TAF chips were stable in tissues for more than 2 months and were capable of providing repeated measurements of tissue oxygenation for extended periods of time. The results demonstrated that the newly fabricated, highly oxygen-sensitive LiNc:TAF chip will enhance the applicability of EPR oximetry for long-term and clinical applications.

Item Type:Article
Uncontrolled Keywords:Encapsulation - Oxygen permeability - EPR oximetry - Implantable biosensor - Teflon - Lithium naphthalocyanine
Subjects:Biomedical Science > Nanobiotechnology
Biomedical Science > Nanotechnology for human health
Biomedical Science > Nanomedicine
ID Code:8955
Deposited By:IoN
Deposited On:29 Apr 2010 13:44
Last Modified:29 Apr 2010 13:44

Repository Staff Only: item control page