The Novel Assay Method for Nicotine Metabolism to Cotinine Using High Performance Liquid Chromatography
作者:Mitsuo Miyazawa、Yumi Kawauchi、Yoshiharu Okuno、Yoshimitsu Oda
DOI:10.1248/cpb.59.295
日期:——
Nicotine is the primary psychoactive component in tobacco. It is taken into the body by tobacco smoking, and mainly metabolized to cotinine in the hepatic cytochrme P450 (CYP) 2A6. The objective of this study was to develop a sensitive method for the determination of nicotine metabolism to cotinine using HPLC. The internal standard, trans-4′-carboxycotinine methyl ester was synthesized with a simple method. The nicotine and cotinine were separated completely and detected by C18 5-μm analytical column (L-column Octa decyl silyl (ODS), 150 mm×4.6 mm i.d.) equipped with a C18 5-μm guard column (L-column ODS, 10 mm×4.6 mm i.d.) and ultraviolet detection at 260 nm. The detection limit of the assay was 0.05 μM for cotinine (n=5, R.S.D) and 0.1 μM for nicotine. Thus the present results provided a sensitive and useful method for the determination of nicotine metabolism catalyzed by CYP2A6.
Synthesis and Evaluation of Nicotine Analogs as Neuronal Nicotinic Acetylcholine Receptor Ligands
作者:Nan-Horng Lin、George M. Carrera、David J. Anderson
DOI:10.1021/jm00047a012
日期:1994.10
3'-, 4'-, and 5'-substituted nicotine analogs have been synthesized and evaluated as ligands of the neuronalnicotinicacetylcholinereceptor. The compounds prepared were found to have bindingaffinities ranging from 4 to 3500 nM. The results indicate that only a small substituent or functionality is well tolerated at the C4' position of nicotine and that bindingaffinity is affected by both steric and