title: Glassy carbon pre-column for direct determination of acetylcholine and choline in biological samples using liquid chromatography with electrochemical detection.
abstract: The determination of acetylcholine and choline has been quite successfully accomplished using liquid chromatography with electrochemical detection following the original reports of Potter et al. [J. Neurochem., 41 (1984) 188]. A post-column reactor containing acetylcholinesterase and choline oxidase allows conversion of the desired species into hydrogen peroxide, an electrochemically active substance. However, the direct injection of tissue homogenates and other biological samples into such a system exhibits quite large solvent fronts and unidentified peaks. Using a pre-column packed with glassy carbon particles, we were able to dramatically decrease the size of the solvent front for such injections and tentatively identify the unknown peaks to be caused, at least in part, by common catecholamines. The glassy carbon pre-column, in addition to increasing the selectivity of the results, allowed the required chromatographic time per sample to be decreased from 20 to 10 min.
authors.affiliation: Department of Neuropsychopharmacology (Tsumura), Gunma University, School of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ikarashi
authors.forename: H
authors.initials: H
authors.lastname: Iwatsuki
authors.forename: C L
authors.initials: CL
authors.lastname: Blank
authors.forename: Y
authors.initials: Y
authors.lastname: Maruyama
mesh_terms: D000109:Acetylcholine / Q000032:analysis*; D000818:Animals; D001923:Brain Chemistry; D002244:Carbon; D002395:Catecholamines / Q000032:analysis; D002531:Cerebellum / Q000737:chemistry; D002540:Cerebral Cortex / Q000737:chemistry; D002794:Choline / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods*; D003342:Corpus Striatum / Q000737:chemistry; D004563:Electrochemistry; D005898:Glass; D007031:Hypothalamus / Q000737:chemistry; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002395:Catecholamines; D002244:Carbon; D002794:Choline; D000109:Acetylcholine