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Thermal modulator for 2D GC: 2D separation requires careful optimisation

Date: Feb 6, 2019

Author: Ryan De Vooght-Johnson

A new type of thermal modulator, acting as the interface between the two separation columns in 2D GC, has been recently introduced. Researchers from the University of Messina, Italy, examined the effects of various parameters of the unit on the 2D GC’s performance, looking at a mixture of three alkanes and a sample of diesel fuel.

Read More thumbnail image: Thermal modulator for 2D GC 2D separation requires careful optimisation

Photoionisation aids crude oil separation

Date: Jan 28, 2019

Author: Ryan De Vooght-Johnson

Despite its economic importance and environmental impact, the analysis of crude oil remains a challenge owing to the vast numbers of compounds present, including many isomers. Researchers from the Max Planck Institute for Coal Researcj (Mülheim an der Ruhr, Germany) used GC in combination with Orbitrap mass spectrometry and both electron ionisation and photoionisation to examine a light crude oil condensate, separating some of the isomers present.

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Journal Highlight: Detection of cutting agents in drug‐positive seized exhibits within the United States

Date: Jan 23, 2019

Author: separationsNOW

The presence and identification of cutting agents in seized drug exhibits collected in two U.S. states has been confirmed by a dilute‐and‐shoot procedure involving GC/MS followed by LC/MS on a quadrupole-time-of-flight instrument.

Read More thumbnail image: Journal Highlight Detection of cutting agents in drugpositive seized exhibits within the United States

Careful studies can address the snags in isotope MS

Date: Jan 15, 2019

Author: Ryan De Vooght-Johnson

Studies using deuterium in place of hydrogen can help to reveal reaction mechanisms, but the determination of the ratios of the various deuterated species produced can be difficult. Scientists from Asbury University and the University of Kentucky (both Lexington, Kentucky) looked at various possible sources of error in mechanistic studies involving the GC-MS spectra of partially deuterated hydrocarbon products from the Fischer–Tropsch reaction.

Read More thumbnail image: Careful studies can address the snags in isotope MS

GC finds brain variations from radiation alterations

Date: Jan 8, 2019

Author: Ryan De Vooght-Johnson

Excess ionising radiation is known to cause brain damage, but there have been few studies examining the short-term effects of radiation on the brain. Researchers from Soochow University (Suzhou, China) examined the brain metabolites of irradiated rats using GC-MS, looking at the changes in metabolite levels 48 hours after irradiation. 

Read More thumbnail image: GC finds brain variations from radiation alterations

Breaking the mould with X-ray APCI

Date: Dec 13, 2018

Author: Ryan De Vooght-Johnson

Mould species can be detected by identifying their volatile metabolites by GC-MS, but electron ionisation often gives confusing output, with weak or non-existent molecular ions and multiple fragment ions. Scientists from the University of Potsdam and the Technical University of Berlin examined the volatile compounds produced from mould species growing on barley grains by GC-MS with atmospheric-pressure chemical ionisation (APCI) using an X-ray source. 

Read More thumbnail image: Breaking the mould with X-ray APCI

Journal Highlight: IRMS delta values (13C) of nandrolone and testosterone products available in the UK: Implications for anti‐doping

Date: Dec 10, 2018

Author: separationsNOW

The δ13C values of some commercial steroid preparations containing nandrolone, measured using GC–C–IRMS, overlap with the endogenous range, which could prevent the confirmation of nandrolone administration using GC–C–IRMS in anti‐doping cases.

Read More thumbnail image: Journal Highlight IRMS delta values 13C of nandrolone and testosterone products available in the UK Implications for antidoping

Which MS should be selected so that steroids are detected?

Date: Nov 29, 2018

Author: Ryan De Vooght-Johnson

The continued use of anabolic steroids in sport is a challenge to anti-doping laboratories, which need to have methods that can detect low levels of these drugs. A team of scientists from Anti-Doping Lab Qatar in Doha, Wageningen University and the University of Groningen (the latter two both Netherlands) compared the effectiveness of quadrupole time-of-flight and quadrupole-Orbitrap mass spectrometry for detecting anabolic steroids in urine samples.

Read More thumbnail image: Which MS should be selected so that steroids are detected

Journal Highlight: Gas chromatography selectivity of new phosphonium‐based dicationic ionic liquid stationary phases

Date: Nov 12, 2018

Author: separationsNOW

Three phosphonium‐based dicationic ionic liquids were synthesized as bis(trifluoromethylsulfonyl) imide salts for use as ionic liquids with unique selectivity for gas chromatography.

Read More thumbnail image: Journal Highlight Gas chromatography selectivity of new phosphoniumbased dicationic ionic liquid stationary phases

Methane method makes mixture measurement quicker

Date: Oct 1, 2018

Author: Ryan De Vooght-Johnson

GC using a flame ionisation detector (FID) is a common and effective way of analysing mixtures of organic compounds, but quantification of every compound typically requires the preparation and injection of many standard solutions. Scientists from the University of Texas at Arlington used a carbon reactor prior to the FID that converted the analyte’s carbon atoms to methane, thus minimising the need for standards.

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