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• W2025662009 endingPage "675" @default.
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• W2025662009 abstract "Like native DOPA, [ 18 F]-6-fluoro-l-3,4-dihydroxyphenylalanine ([ 18 F]FDOPA) is subject to methylation and decarboxylation. To determine the rates of formation and elimination of [ 18 F]FDOPA metabolites, plasma from human subjects undergoing positron emission tomographic (PET) studies was analyzed by high-performance liquid chromatography (HPLC). In addition to the principal metabolite O-methyl-[ 18 F]FDOPA (OMe-[ 18 F]FDOPA), two decarboxylated metabolites were detected in plasma from carbidopa pretreated subjects. The concentrations of each metabolite during 90 min following tracer injection could be described as a function of the concentration of [ 18 F]FDOPA, and two rate constants; k 0 , the rate of formation, and k –1 , the rate of clearance. Plasma metabolite time series generated from total plasma activity curves and measured rate constants were in close agreement with the actual concentrations determined by HPLC fractionation. Population means for k 0 (0.011 ± 0.002 min −1 ) and k –1 , (0.010 ± 0.003 min −1 ) were used to generate “simulated” plasma curves. The measured and generated plasma curves were used as inputs for estimation of partition and decarboxylation coefficients of [ 18 F]FDOPA in brain. The use of generated input functions from normal population means of transfer coefficients did not introduce a systematic error into the estimate of the enzyme activity. However, the high variability of these estimates in patients precludes the use of this technique as an alterative to individual HPLC measurements." @default.
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• W2025662009 date "1993-07-01" @default.
• W2025662009 modified "2023-09-27" @default.
• W2025662009 title "Pharmacokinetics of Plasma 6-[¹⁸F]Fluoro-l-3,4-Dihydroxyphenylalanine ([¹⁸F]FDOPA) in Humans" @default.
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• W2025662009 doi "https://doi.org/10.1038/jcbfm.1993.85" @default.
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