Speciation of Se(IV) and the selenoamino acids by high-performance liquid chromatography-direct hydride generation-atomic fluorescence spectrometry

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Abstract

The speciation of selenocystine (SeCys), selenomethionine (SeMet), selenoethionine (SeEt) and Se(IV) was performed by on-line coupling of high-performance liquid chromatography (HPLC) and atomic fluorescence spectrometry (AFS) with hydride generation (HG) as high efficiency sample introduction system. Reversed-phase liquid chromatography was applied to separate the selenium species with 0.01M ammonium acetate buffer (pH=4) eluent containing 0.5% (v/v) methanol and 0.1moll-1 of DDAB. The operating conditions for chromatographic separation (gradient elution, run time) and hydride generation (concentration of HCl and NaBH4 solution, argon and hydrogen flow rates) were carefully optimized. The efficiency of hydride generation for all of the four species was measured. Detection limits (DLs) obtained for SeCys, SeMet, SeEt and Se(IV) are 18, 70, 96, and 16μgl-1, respectively. The analytical performance of the method was controlled by measuring the selenium content of spiked selenium food supplements. The range of obtained recoveries is 90-110%.

Original languageEnglish
Pages (from-to)367-375
Number of pages9
JournalAnalytica Chimica Acta
Volume435
Issue number2
DOIs
Publication statusPublished - May 24 2001

Keywords

  • Atomic fluorescence spectrometry
  • Hydride generation
  • Selenoamino acids
  • Speciation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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