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Updated: Jul 10, 2026

A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites
Published on: March 1, 2018
[New methods of chemical and toxicological study of clonidine (Clophelinum)]
Abstract:
Clophelinum (clonidine) has hypotensive and soothing effect. The literature describes cases of a poisoning with clonidine, the majority of which are of the criminal character. Symptoms of clonidine intoxication differ from poisoning with other substances. Clinical picture of poisoning with clonidine is complex enough. Pathological and histological changes in internal organs in case of poisoning with clonidine are non specific. The methods of sampling, isolation, and qualitative determination need improvement. The aim of the research was investigation of chemical and toxicological properties of Clophelinum to develop new techniques of isolation and identification of clonidine. The technique of isolation is characterized by high degree of isolation (96 %), and technique of identification by high sensitivity (0,1 mkg/ml), which proves their efficiecy.
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One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...

