22 February 2006 Long wavelength fluorescence based biosensors for in vivo continuous monitoring of metabolites
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Abstract
The early stage development studies of novel implantable continuous metabolite sensor systems for glucose, lactate and fatty acids are discussed. These sensors utilize non-enzymatic "reagentless" sensor systems based on NIR fluorophore-labeled binding proteins. For in vivo applications, NIR fluorescence based systems (beyond 600 nm) have the added benefit of reduced interference from background scattering, tissue and serum absorption and cell auto-fluorescence. The long wavelength emission facilitates implanted sensor disks to transmit fluorescence to an external reader through wireless connections and the resulting fluorescence signals can be correlated to metabolite concentrations. We have developed a prototype optical system that uses a bifurcated optical fiber to transmit excitation and read emission at the surface of the skin. With this system, fluorescence signals were read over time through animal skin. The changes in glucose concentration were studied using immobilized sensor proteins and were compared to non-immobilized sensors in solution. For sensors in solution, no response delay was observed. For immobilized systems, the fluorescence response showed a delay corresponding to the diffusion time for the metabolite to equilibrate within the sensor.
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Joseph Thomas, Arounaguiry Ambroise, Kara Birchfield, Wensheng Cai, Christian Sandmann, Sarabjit Singh, Kristin Weidemaier, J. Bruce Pitner, "Long wavelength fluorescence based biosensors for in vivo continuous monitoring of metabolites", Proc. SPIE 6078, Photonic Therapeutics and Diagnostics II, 60781Y (22 February 2006); doi: 10.1117/12.643929; https://doi.org/10.1117/12.643929
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