Metabolomic profiling of anionic metabolites by capillary electrophoresis mass spectrometry

Tomoyoshi Soga, Kaori Igarashi, Chiharu Ito, Katsuo Mizobuchi, Hans Peter Zimmermann, Masaru Tomita

研究成果: Article査読

224 被引用数 (Scopus)


We describe a sheath flow capillary electrophoresis time-of-flight mass spectrometry (CE-TOFMS) method in the negative mode using a platinum electrospray ionization (ESI) spray needle, which allows the comprehensive analysis of anionic metabolites. The material of the spray needle had significant effect on the measurement of anions. A stainless steel spray needle was oxidized and corroded at the anodic electrode due to electrolysis. The precipitation of iron oxides (rust) plugged the capillary outlet, resulting in shortened capillary lifetime. Many anionic metabolites also formed complexes with the iron oxides or migrating nickel ion, which was also generated by electrolysis and moved toward the cathode (the capillary inlet). The metal-anion complex formation significantly reduced detection sensitivity of the anionic compounds. The use of a platinum ESI needle prevented both oxidation of the metals and needle corrosion. Sensitivity using the platinum needle increased from several- to 63-fold, with the largest improvements for anions exhibiting high metal chelating properties such as carboxylic acids, nucleotides, and coenzyme A compounds. The detection limits for most anions were between 0.03 and 0.87 μmol/L (0.8 and 24 fmol) at a signal-to-noise ratio of 3. This method is quantitative, sensitive, and robust, and its utility was demonstrated by the analysis of the metabolites in the central metabolic pathways extracted from mouse liver.

ジャーナルAnalytical Chemistry
出版ステータスPublished - 2009 8 1

ASJC Scopus subject areas

  • 分析化学


「Metabolomic profiling of anionic metabolites by capillary electrophoresis mass spectrometry」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。