27 December 1995 In-vivo pharmacokinetic study of two fluorescein derivatives by fluorescence spectroscopy
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We have already demonstrated the ability of fluorescence spectroscopy and imaging to measure the pH of superficial tissues using pH sensitive fluorescent probes. The purpose of this study was to investigate the in vivo behavior of such fluorescent probes. We report the monitoring of tissue fluorescence after injection of two fluorescein derivatives (carboxyfluorescein and biscarboxyethyl-carboxyfluorescein). The in vivo study was performed on anaesthetized adult Wistar rats. After laparotomy, CF or BCECF solution was injected into the penial vein. Fluorescence spectra were recorded during one hour using an optical multichannel analyzer coupled to a CCD camera. Fiber optic was placed alternatively on the liver area or on the skin. Blood samples were collected and fluorescence was measured in vitro. A clear linear relationship between dose and fluorescence intensity was found in liver for these fluorescent markers. Concerning spectral characteristics, it was found that CF and BCECF spectra show a shift compared to in vivo maximum emission peak and BCECF emission peak was different when recorded in the liver and in the skin. Differences of kinetic profiles are also observed between CF and BCECF. The BCECF derivative displays a fluorescence peak in the liver two minutes after injection, while CF fluorescence peak is observed seven minutes after injection. Clearance of skin fluorescence is slower than the plasmatic one indicating that dye elimination in superficial blood vessels does not follow the same pharmacokinetic behavior. Based on these preliminary findings, fluorescence spectroscopy appears as a tool in pharmacokinetic study in situ and in vivo.
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Sylvie Soulie-Begu, Sylvie Soulie-Begu, Jean-Marie Devoisselle, Jean-Marie Devoisselle, Serge R. Mordon, Serge R. Mordon, } "In-vivo pharmacokinetic study of two fluorescein derivatives by fluorescence spectroscopy", Proc. SPIE 2627, Optical Biopsies, (27 December 1995); doi: 10.1117/12.228881; https://doi.org/10.1117/12.228881

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