Qualitative and quantitative analysis of amino acids by capillary electrophoresis-electrospray ionization-tandem mass spectrometry

Tomoyoshi Soga, Yuji Kakazu, Martin Robert, Masaru Tomita, Takaaki Nishioka

Research output: Contribution to journalArticle

108 Citations (Scopus)

Abstract

We describe a method to identify and quantify amino acids using capillary electrophoresis-electrospray ionization-triple-quadrupole tandem mass spectrometry (CE-ESI-MS/MS). Amino acids, including physiological amino acids, were first separated by CE under acidic pH conditions and then detected by MS/MS. To efficiently introduce the whole sample into the capillary, no electrical potential was applied to the electrospray probe until running electrophoresis. The position of the electrosprayer with respect to the MS capillary entrance drastically affected sensitivity and generation of cluster ions. MS/MS with multiple reaction monitoring (MRM) detection was performed to obtain sufficient selectivity and sensitivity. Under optimized CE-MS/MS conditions, the minimum detectable levels for 32 free amino acids normally found in proteins and other physiological amino acids were between 0.1 and 14 μmol/L with pressure injection of 50 mbar for 3 s (3 nL) at a signal-to-noise ratio of 3. For most amino acids, this constitutes a severalfold increase in sensitivity compared to CE-MS. The relative standard deviations (% RSD) for all amino acids were better than 0.4% for migration times and between 1.4% and 8.6% for peak areas (n = 10). Since amino acids exhibited characteristic MS/MS spectra, this approach is useful for the simultaneous, selective, quantitative, and reproducible analysis of amino acids in physiological and biological samples that contain various kinds of matrices. The power of the method was demonstrated by analyzing amino acids in human urine.

Original languageEnglish
Pages (from-to)1964-1972
Number of pages9
JournalElectrophoresis
Volume25
Issue number13
DOIs
Publication statusPublished - 2004 Jul

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Capillary electrophoresis
Electrospray ionization
Electrospray Ionization Mass Spectrometry
Capillary Electrophoresis
Tandem Mass Spectrometry
Mass spectrometry
Amino Acids
Chemical analysis
Signal-To-Noise Ratio
Electrophoresis
Running
Signal to noise ratio
Urine
Ions
Pressure

Keywords

  • Amino acid
  • Capillary electrophoresis
  • Mass spectrometry
  • Triple-quadrupole tandem mass spectrometry
  • Urine

ASJC Scopus subject areas

  • Clinical Biochemistry

Cite this

Qualitative and quantitative analysis of amino acids by capillary electrophoresis-electrospray ionization-tandem mass spectrometry. / Soga, Tomoyoshi; Kakazu, Yuji; Robert, Martin; Tomita, Masaru; Nishioka, Takaaki.

In: Electrophoresis, Vol. 25, No. 13, 07.2004, p. 1964-1972.

Research output: Contribution to journalArticle

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