Diagnostic imaging using rare-earth chelates
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Abstract
A new class of polyazamacrocyclic chelates of terbium is studied that have rich spectroscopic properties, tissue selectivity [1], millisecond fluorescence lifetimes, sharply spiked emission spectra (<15 nm FWHM), large Stokes shifts (>280 nm), good water solubility [1] and high fluorescence quantum yields (∼0.6 for PCTMB) [1]. We report our in vitro and ex vivo spectroscopic evaluation of these chelates. Additionally, results from cellular binding specificity studies using Sprague-Dawley rats with UMR 108 osteosarcomas are presented. Finally, endoscopic imaging of dosed tissue demonstrates the potential to use the Tb(III) chelates as contrast enhancement markers.
Keywords
Fluorescence Lanthanide chelate Probes Tissue selectivityPreview
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