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Michalke, B. ; Berthele, A.* ; Mistriotis, P.* ; Ochsenkühn-Petropoulou, M.* ; Halbach, S.

Manganese speciation in human cerebrospinal fluid using CZE coupled to inductively coupled plasma MS.

Electrophoresis 28, 1380-1386 (2007)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
The neurotoxic effects of manganese (Mn) at elevated concentrations are well known. This raises the question, which of the Mn species can cross neural barriers and appear in cerebrospinal fluid (CSF). CSF is the last matrix in a living human organism available for analysis before a compound reaches the brain cells and therefore it is assumed to reflect best the internal exposure of brain tissue to Mn species. A previously developed CE method was modified for separation of albumin, histidine, tyrosine, cystine, fumarate, malate, inorganic Mn, oxalacetate, -keto-glutarate, nicotinamide-dinucleotide (NAD), citrate, adenosine, glutathione, and glutamine. These compounds are supposed in the literature to act as potential Mn carriers. In a first attempt, these compounds were analyzed by CZE-UV to check whether they are present in CSF. The CZE-UV method was simpler than the coupled CZE-inductively coupled plasma (ICP)-dynamic reaction cell (DRC)-MS method and it was therefore chosen to obtain a first overview information. In a second step, the coupled method (CZE-ICP-DRC-MS) was used to analyze, in detail, which of the compounds found in CSF by CZE-UV were actually bound to Mn. Finally, 13 Mn species were monitored in CSF samples, most of them being identified: Mn-histidine, Mn-fumarate, Mn-malate, inorganic Mn, Mn-oxalacetate, Mn--keto glutarate, Mn-carrying NAD, Mn-citrate and Mn-adenosine. By far the most abundant Mn species was Mn-citrate showing a concentration of 0.7 ± 0.13 µg Mn/L. Interestingly, several other Mn species can be related to the citric acid cycle.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Cerebrospinal fluid; Inductively coupled plasma MS; Coupling; CZE; Dynamic reaction cell; Manganese
ISSN (print) / ISBN 0173-0835
e-ISSN 1522-2683
Journal Electrophoresis
Quellenangaben Volume: 28, Issue: 9, Pages: 1380-1386 Article Number: , Supplement: ,
Publisher Wiley
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Ecological Chemistry (IOEC)
Institute of Molecular Toxicology and Pharmacology (TOXI)