Measurement of the δ34S value in methionine by double spike multi-collector thermal ionization mass spectrometry using Carius tube digestion

Autor:	W. Robert Kelly, Jacqueline L. Mann
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Accuracy and precision Methionine Isotope Organic Chemistry Analytical chemistry chemistry.chemical_element Thermal ionization mass spectrometry Sulfur Troilite Analytical Chemistry chemistry.chemical_compound δ34S chemistry Spectroscopy Essential amino acid
Zdroj:	Rapid Communications in Mass Spectrometry. 24:2673-2679
ISSN:	0951-4198
DOI:	10.1002/rcm.4686
Popis:	Methionine is an essential amino acid and is the primary source of sulfur for humans. Using the double spike ((33)S-(36)S) multi-collector thermal ionization mass spectrometry (MC-TIMS) technique, three sample bottles of a methionine material obtained from the Institute for Reference Materials and Measurements have been measured for delta(34)S and sulfur concentration. The mean delta(34)S value, relative to Vienna Canyon Diablo Troilite (VCDT), determined was 10.34 +/- 0.11 per thousand (n = 9) with the uncertainty reported as expanded uncertainties (U). These delta(34)S measurements include a correction for blank which has been previously ignored in studies of sulfur isotopic composition. The sulfur concentrations for the three bottles range from 56 to 88 microg/g. The isotope composition and concentration results demonstrate the high accuracy and precision of the DS-MC-TIMS technique for measuring sulfur in methionine.
Databáze:	OpenAIRE
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