Under production conditions, the analysis procedure should be rapid and provide results at the ppm level. In the present work, a procedure for determining sultones based on gas chromatography-mass spectrometry is improved. delta-Hexadecanesultone isolated from the sulfonation reaction mass is used as...
Ultra-high-resolution mass spectrometry was used to investigate the characterization of aerosol organonitrates (ONs). ONs featured high-molecular-weight (HMW), high unsaturation, and high functionalization. Under high air pollution events, the number of N1Oxclass ONs composed of aliphatic and aromatic...
Elemental analysis unveiled very low total organic carbon (TOC) contents coming from this unique assemblage of microorganisms, with a maximum of 0.11% dry weight, and no detectable nitrogen (Table1). Gas chromatography–mass spectrometry (GC-MS) showed that the lipid fraction of this TOC was mai...
Rapid Communications in Mass Spectrometry RcmSturm, P., Leuenberger, M., Moncrieff, J., and Ramonet, M.: Atmo- spheric O2, CO2 and δ13C measurements from aircraft sampling over Griffin Forest, Perthshire, UK, Rapid Commun. Mass Sp., 19, 2399-2406, 2005a....
When His57 is protonated in acidic conditions (pH 3.5), the 1H NMR signal for the proton occurs at a chemical shift of 18.3 ppm in H2O; in D2O the 2H NMR chemical shift of the hydrogen-bonded deuteron is shifted upfield by 1.0±0.4 ppm, as expected for short strong/low barrier ...
The instrument was operated in a data-dependent mode with a 3 s cycle time and the most intense precursor priority and the dynamic exclusion set to an exclusion duration of 60s with a 10 ppm tolerance. Biological samples were run on an identical gradient as the GPFs using a staggered window...
trace-gas research in the ppm and ppb range. Dual Inlet Analysis The Thermo Scientific Dual Inlet system delivers ultimate precision and accuracy by close comparison of clean sample and reference gases under viscous flow conditions. The Dual Inlet system uses monolithic, all-metal valve bl...
13C-NMR (CDCl3) δ ppm (125 MHz): 54.0, 111.8, 123.6, 126.7, 126.9, 128.0, 128.1, 131.7, 132.2, 140.9, 151.2, 157.7, 165.4, 166.5 Considering the HPLC purity that was 99.5% or more, the mass spectrometry, and the NMR spectral pattern, the thus synthesized compound is supported to ...
Abstract: Described herein is crystalline sodium (E)-2-(4-((3-(4-fluorophenyl)-3-(4-(3-morpholinoprop-1-yn-1-yl)phenyl)allyl)oxy)-2-methylphenoxy)acetate, uses of such crystalline material in the preparation of pharmaceutical compositions for the treatment of diseases or conditions that wou...
Rapid Communications in Mass SpectrometryHenning M, Strapoc D, Lis GP, Sauer P, Fong J, Schimmelmann A, Pratt LM . Versatile inlet system for on-line compound-specific δD and δ 13 C gas chromatography-oxidation/reduction-isotope ratio mass spectrometry analysis of gaseous mixtures . Rapid ...