title: A GC-MS/MS method for the quantitative analysis of low levels of the tyrosine metabolites maleylacetone, succinylacetone, and the tyrosine metabolism inhibitor dichloroacetate in biological fluids and tissues.
abstract: We developed a sensitive method to quantitate the tyrosine metabolites maleylacetone (MA) and succinylacetone (SA) and the tyrosine metabolism inhibitor dichloroacetate (DCA) in biological specimens. Accumulation of these metabolites may be responsible for the toxicity observed when exposed to DCA. Detection limits of previous methods are 200 ng/mL (1.2 pmol/microL) (MA) and 2.6 microg/mL (16.5 pmol/microL) (SA) but the metabolites are likely present in lower levels in biological specimens. To increase sensitivity, analytes were extracted from liver, urine, plasma and cultured nerve cells before and after dosing with DCA, derivatized to their pentafluorobenzyl esters, and analyzed via GC-MS/MS.
authors.affiliation: Division of Endocrinology and Metabolism, Department of Medicine, University of Florida, Gainesville, FL 32610, USA.
authors.forename: Melissa D
authors.initials: MD
authors.lastname: Zolodz
authors.forename: Minghong
authors.initials: M
authors.lastname: Jia
authors.forename: Huiping
authors.initials: H
authors.lastname: Liu
authors.forename: George N
authors.initials: GN
authors.lastname: Henderson
authors.forename: Peter W
authors.initials: PW
authors.lastname: Stacpoole
mesh_terms: D000096:Acetone / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism / Q000652:urine; D000818:Animals; D015153:Blotting, Western; D003999:Dichloroacetic Acid / Q000097:blood / Q000378:metabolism* / Q000652:urine; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006537:Heptanoates / Q000097:blood / Q000378:metabolism* / Q000652:urine; D006801:Humans; D008099:Liver / Q000378:metabolism; D008297:Male; D008298:Maleates / Q000097:blood / Q000378:metabolism* / Q000652:urine; D051381:Rats; D012680:Sensitivity and Specificity; D014443:Tyrosine / Q000037:antagonists & inhibitors / Q000097:blood / Q000378:metabolism* / Q000652:urine
chemical_list: D006537:Heptanoates; D008298:Maleates; C460372:maleylacetone; D000096:Acetone; D014443:Tyrosine; C020804:succinylacetone; D003999:Dichloroacetic Acid