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A Simple, Sensitive, and Economic Assay for Choline and Acetylcholine Using HPLC, an Enzyme Reactor, and an Electrochemical Detector
Author(s) -
Damsma G.,
Westerink B. H. C.,
Horn A. S.
Publication year - 1985
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1985.tb07238.x
Subject(s) - choline oxidase , acetylcholine , choline , chemistry , chromatography , acetylcholinesterase , high performance liquid chromatography , choline kinase , hydrogen peroxide , enzyme , biochemistry , biology , pharmacology , phospholipid , membrane , phosphatidylcholine
A simple, efficient, economic, and sensitive method is presented for the detection of choline and acetylcholine in neuronal tissue using HPLC, a postcolumn enzyme reactor with immobilized enzyme, and electrochemical detection. The method is based on a separation of choline and acetylcholine by cation exchange HPLC followed by passage of the effluent through a postcolumn reactor containing a mixture of acetylcholinesterase and choline oxidase; the latter enzyme converts choline to betaine and hydrogen peroxide, the former enzyme hydrolyzes acetylcholine to acetate and choline. The hydrogen peroxide produced is electrochemically detected. A simple and efficient preparation of neuronal tissue is described using an optional prepurification step on Sephadex G‐10 columns, offering the possibility to detect choline and acetylcholine as well as catecholamines and their related metabolites in the same tissue sample. The sensitivity of the assay system is 250 fmol for choline and 500 fmol for acetylcholine.