Determination of the selenium isotopic compositions in Se-rich yeast by hydride generation-inductively coupled plasma multicollector mass spectrometry

J. Far , Sylvain Bérail (1) , Hugues Preud'Homme (2) , Ryszard Lobinski (2)

1 IPREM - Institut pluridisciplinaire de recherche sur l'environnement et les matériaux
2 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux

A method was developed for the precise determination of selenium isotopic compositions (δ82/77Se, δ82/76Se and δ82/74Se) by hydride generation inductively coupled plasma multiple collector mass spectrometry (HG-MC ICP MS) in Se-rich yeast. The conversion of all the selenium forms into Se(iv) during digestion and reduction steps was investigated by anion-exchange ICP quadrupole MS (SAX ICP Q MS) and was found to be complete. Measurement precision values expressed as deltas (δ) with regard to NIST SRM3149 were between 0.2-0.4‰ (2SD) over a period of 6 months for 25 or 50 ng mL-1 of introduced selenium. The application of the method to the analysis of nine Se-rich yeast supplements from different manufactures showed significant variations in the isotope ratios suggesting that the latter can be an attractive parameter for the yeast provenance discrimination. © 2010 The Royal Society of Chemistry.

Domaines: Chimie analytique

J. Far, Sylvain Bérail, Hugues Preud'Homme, Ryszard Lobinski. Determination of the selenium isotopic compositions in Se-rich yeast by hydride generation-inductively coupled plasma multicollector mass spectrometry. Journal of Analytical Atomic Spectrometry, 2010, 25 (11), pp.1695-1703. ⟨10.1039/c004933f⟩. ⟨hal-01560353⟩