Disentangling Oil Weathering Using GC×GC. 1. Chromatogram Analysis
Environmental Science & Technology, 2007 Historically, the thousands of compounds found in oils constituted an "unresolved complex mixture" that frustrated efforts to analyze oil weathering. Moreover, different weathering processes inflict rich and diverse signatures of compositional change in oil, and conventional methods do not effectively decode this elaborate record.
J Samuel, Arey +2 more
openaire +2 more sources
Enzymatic digestion and selective quantification of underivatised [delta]9-tetrahydrocannabinol and cocaine in human hair using gas chromatography-mass spectrometry. [PDF]
, 2012 Gas chromatography-mass spectrometric (GC-MS) methods for drug analysis routinely employ derivatising reagents. The aim of this paper was to develop a method for the analysis of two recreational drugs, delta-9-tetrahydrocannabinol ([delta](9)-THC) and ...
Barker, James +3 more
core +3 more sources
GC×GC-TOFMS analysis of ethanodiamondoids in Ordovician oil from well SN1, Tarim Basin
Shiyou shiyan dizhi, 2023 By 2D gas chromatography and time-of-flight mass spectrometry (GC×GC-TOFMS), 81 ethanodiamondoids with 1-3 cages were detected quantitatively in Ordovician crude oil from well SN1, Shuntuoguole area, Tarim Basin, including 47 ethanoadamantanes with total
Xiao YU +4 more
doaj +1 more source
The SLUGGS Survey: Globular cluster system kinematics and substructure in NGC 4365 [PDF]
, 2012 We present a kinematic analysis of the globular cluster (GC) system of the giant elliptical galaxy NGC 4365 and find several distinct kinematic substructures.
Aaron J. Romanowsky +48 more
core +4 more sources
4-t-Butylbenzylation of carboxylic acid for GC–MS analysis
SN Applied Sciences, 2020 We report a 4-t-butylbenzyl derivatization for the analysis of carboxylic acids by GC–MS (EI). Carboxylic acids were analyzed as a 4-t-butylbenzyl ester after the derivatization with 4-t-butylbenzyl bromide. On the mass spectra of 4-t-butylbenzyl ester, [
Shinji Tsunoi +5 more
doaj +1 more source
Molecules, 2021 Lippia alba (Mill.) N. E. Br. (Verbenaceae) is an aromatic shrub whose essential oils have stood out as a promising source for application in several industrial fields. In this study, the essential oils chemical characterization of eight new L.
Leila Gimenes +5 more
doaj +1 more source
Recent trends and developments in pyrolysis-gas chromatography: review [PDF]
, 2008 Pyrolysis-gas chromatography (Py-GC) has become well established as a simple, quick and reliable analytical technique for a range of applications including the analysis of polymeric materials.
Arias +179 more
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Current Research in Food Science, 2023 Maillard reaction products (MRPs) with roasted/broth flavors were prepared and analyzed for the resulting flavor differences. The identification of volatile compounds in MRPs was carried out by GC-MS and GC × GC-ToF-MS.
An-Ran Zheng +5 more
doaj +1 more source
Evidence for a Weak Galactic Center Magnetic Field from Diffuse Low Frequency Nonthermal Radio Emission [PDF]
, 2005 New low-frequency 74 and 330 MHz observations of the Galactic center (GC) region reveal the presence of a large-scale ($6\arcdeg\times 2\arcdeg$) diffuse source of nonthermal synchrotron emission. A minimum energy analysis of this emission yields a total
Blitz L. +11 more
core +6 more sources
Steroid estrogen determination in sediment and sewage sludge: A critique of chromatographic / mass spectrometry methods incorporating a case study in method development [PDF]
, 2004 Current analytical methods for determining steroids in sewage sludge and sediment are reviewed and experimental data comparing LC/MS ESI and GC/MS quantification of extracts from these matrices is presented.
Avcioglu, E +3 more
core +1 more source