Determination of the 15N/14N ratio of ammonium and ammonia in aqueous solutions by equilibrium headspace-gas chromatography-combustion-isotope ratio mass spectrometry

The Analyst ◽  
2002 ◽  
Vol 127 (6) ◽  
pp. 735-740 ◽  
Author(s):  
Elin Norlin ◽  
Knut Irgum ◽  
K. E. Anders Ohlsson
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Aqueous Solutions ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Headspace Gas Chromatography ◽  
Headspace Gas

Rapid determination of BTEXS in olives and olive oil by headspace-gas chromatography/mass spectrometry (HS-GC–MS)

Talanta ◽  
2010 ◽  
Vol 83 (2) ◽  
pp. 391-399 ◽  
Author(s):  
Bienvenida Gilbert-López ◽  
José Robles-Molina ◽  
Juan F. García-Reyes ◽  
Antonio Molina-Díaz
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Olive Oil ◽  
Rapid Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Headspace Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Headspace Gas

Determination of (13C)urea enrichment by gas chromatography/mass spectrometry and gas chromatography/isotope ratio mass spectrometry

1994 ◽  
Vol 23 (8) ◽  
pp. 510-513 ◽  
Author(s):  
Michel Beylot ◽  
France David ◽  
Yadh Khalfallah ◽  
Sylvie Normand ◽  
Valerie Large ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry

Determination of the exogenous character of testosterone in bovine urine by gas chromatography-combustion-isotope ratio mass spectrometry†

The Analyst ◽  
1998 ◽  
Vol 123 (12) ◽  
pp. 2617-2620 ◽  
Author(s):  
Véronique Ferchaud ◽  
Bruno Le Bizec ◽  
Fabrice Monteau ◽  
François André
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Bovine Urine

Headspace-gas chromatography-mass spectrometry for the rapid determination of possible biomarkers in urine samples

2017 ◽  
Vol 9 (39) ◽  
pp. 5784-5790 ◽  
Author(s):  
Rosa María González Paredes ◽  
Carmelo García Pinto ◽  
José Luis Pérez Pavón ◽  
Bernardo Moreno Cordero
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Rapid Determination ◽  
Vital Role ◽  
Urine Samples ◽  
Gas Chromatography Mass Spectrometry ◽  
Headspace Gas Chromatography ◽  
Headspace Gas ◽  
Analytical Strategies

The development of rapid analytical strategies plays a vital role for the research, discovery and confirmation of analytes that can be sensitive biomarkers.

scholarly journals Determination of the δ 2H Values of High Molecular Weight Lipids by High Temperature GC Coupled to Isotope Ratio Mass Spectrometry

2020 ◽  
Author(s):  
Sabine Lengger ◽  
Yuki Weber ◽  
Kyle W. Taylor ◽  
Sebastian H. Kopf ◽  
Robert Berstan ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Molecular Weight ◽  
Gas Chromatography ◽  
High Temperature ◽  
High Molecular Weight ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Widespread Interest ◽  
Isotope Analyses

<div>Rationale: The hydrogen isotopic composition of lipids (δ 2Hlipid) is widely used in food</div><div>science and as a proxy for past hydrological conditions. Determining the δ 2H values of large,</div><div>well-preserved triacylglycerides and other uniquely microbial lipids, such as glycerol dialkyl</div><div>glycerol tetraether (GDGT) lipids, is thus of widespread interest but has so far not been </div><div>possible due to their size which prohibits analysis by traditional gas chromatography</div><div>pyrolysis isotope ratio mass spectrometry (GC-P-IRMS).</div><div>Methods: We determined the δ 2H values of large, polar molecules and applied high</div><div>temperature gas chromatography (GC) methods on a modified GC-P-IRMS system. The</div><div>methods were validated using authentic standards of large, functionalised molecules</div><div>(triacylglycerides, TAG), purified reference standards of GDGTs, and compared to δ 2H</div><div>values determined by elemental analyser pyrolysis isotope ratio mass spectrometry (EA-PIRMS); and subsequently applied to the analysis of GDGTs in a sample from a methane</div><div>seep and a Welsh peat.</div><div>Results: δ 2H values of TAGs agreed within error between different between GC-P-IRMS and</div><div>EA-P-IRMS, with GC-P-IRMS showing 3-5 ‰ precision for 10 ng H injected. Archaeal lipid</div><div>GDGTs with up to three cyclisations could be analysed: δ 2H values were not significantly</div><div>different between methods with standard deviations of 5 to 6 ‰. When environmental</div><div>samples were analysed, δ 38 2H values of isoGDGTs were 50 ‰ more negative than those of</div><div>terrestrial brGDGTs.</div><div>Conclusions: Our results indicate that the high temperature GC-P-IRMS (HTGC-P-IRMS)</div><div>method developed here is appropriate to determine the δ 2H values of TAGs, GDGT lipids</div><div>with up to two cyclisations, and potentially other high molecular weight compounds. The</div><div>methodology will widen the current analytical window for biomarker and alimentary light</div><div>stable isotope analyses. Moreover, our initial measurements suggest that bacterial and</div><div>archaeal GDGT δ 2H values can record environmental and ecological conditions</div>

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