Summary
The metabolism of galanthamine hydrobromide (Nivalin®) was investigated in rat and rabbit liver homogenates. Experiments were carried out varying several parameters of incubation: substrate (galanthamine hydrobromide, galanthamine, galanthaminone and epigalanthamine), cofactor enrichment (NADPH, NADP/G-6-P, NAD), pH (7.4 and 9.3), time of incubation. Substrates and metabolites were identified and quantitatively determined by GC/MS. In vitro metabolism in rat liver homogenate was negligible. The experiments with rabbit liver homogenate indicated, that galanthamine was actively metabolised the major metabolites being the oxidised product — galanthaminone, and the isomer of galanthamine — epigalantamine. The experimental results show that the metabolism of galanthamine is substrate and product stereoselective.
Similar content being viewed by others
References
Proscurnina, N.F. and Yakovleva, A.P., (1952): J. Gen. Chem. (USSR), For Alkaloids of Galanthus woronowi,22 (10), 1899–1902.
Paskov, D.S., (1959): Nivalin. Pharmacological Characteristics., M. & F, Sofia.
Barton, D.H.R. and Kirby, G.W., (1960): Proc. Chem. Soc, The Synthesis of Galanthamine., 392–393.
Barton, D.H.R. and Kirby, G.W., (1962): J. Chem. Soc., Phenol Oxidation and Biosynthesis. Part V. The Synthesis of Galanthamine., 806–817.
Yamboliev, I.A., (1984): Dissertation: Experimental Studies on the Pharmacokinetics and Pharmacobiochemistry of Nivalin., Sofia.
Gorrod, J.W., Temple, D.J. and Beckett, A.N., (1975): Xenobiotica, The Metabolism of N-Ethyl-N-Methylaniline by Rabbit Liver Microsomes: The Measurement of Metabolites by Gas-Liquid Chromatography.,5 (8), 453–463.
Jakoby, W.B., Bend, J.R., Caldwell, J., (1982): Metabolic Basis of Detoxication. Academic Press. New York., p. 92.
Testa, B., (1981): Pharm. Int., Structural Selectivity and Drug Metabolism: Some Basic Concepts.,2, 22–24.
Testa, B., (1981): Pharm. Int., Regio- and Stereoselectivity in Drug Metabolism: Two Examples.,4, 34–37.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mihailova, D., Velkov, M. & Zhivkova, Z. In vitro metabolism of galanthamine hydrobromide (Nivalin®) by rat and rabbit liver homogenate. European Journal of Drug Metabolism and Pharmacokinetics 12, 25–30 (1987). https://doi.org/10.1007/BF03189858
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF03189858