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  • Title: Biosynthesis and characterization of glucuronide metabolites of fluphenazine: 7-hydroxyfluphenazine glucuronide and fluphenazine glucuronide.
    Author: Jackson CJ, Hubbard JW, Midha KK.
    Journal: Xenobiotica; 1991 Mar; 21(3):383-93. PubMed ID: 1907421.
    Abstract:
    1. To expedite direct studies on phase II metabolites of fluphenazine, pure fluphenazine or 7-hydroxyfluphenazine were incubated with a rabbit hepatic microsomal immobilized enzyme system. After purification and recrystallization a high yield (60%) of 7-hydroxy-beta-D-O-glucuronyl-fluphenazine was obtained. 2. The structure of this glucuronide was proven unambiguously by mass spectrometry (fast atom bombardment, daughter ion analysis, electron impact, chemical ionization) and 1H-n.m.r. and 13C-n.m.r. spectroscopy. The phenolic ether glucuronide was the sole product of the reaction. 3. There was no evidence of conjugation at the primary alcohol group of the side-chain of fluphenazine, or of the formation of quaternary ammonium-linked glucuronides with either of tertiary aliphatic nitrogen atoms of the side-chain. 4. Incubation of fluphenazine with the immobilized enzyme system gave a poor yield (less than 1%) of the aliphatic ether glucuronide as reaction product, consistent with a low susceptibility of the side-chain primary alcohol function of fluphenazine to glucuronidation.
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