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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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Journal Highlight: Enantiomeric identification of pregabalin by GC‐MS via methylation and S‐TPC chiral derivatization

Date: Sep 17, 2018

Author: separationsNOW

Problems associated with the traditional GC‐MS analysis of pregabalin have been overcome by methylating the carboxylic acid group followed by chiral derivatization at the amine group to identify the (S) enantiomer which is a controlled substance.

Read More thumbnail image: Journal Highlight Enantiomeric identification of pregabalin by GCMS via methylation and STPC chiral derivatization

Fast GC runs are fine to measure volatiles in wine

Date: Sep 4, 2018

Author: Ryan De Vooght-Johnson

The flavour of wine and related products largely depends on the volatile compounds present, but existing methods for their analysis tend to be lengthy. Scientists from the Edmund Mach Foundation (near Trento, Italy) developed a new, fast GC method for analysing wine volatiles, applying it to white wine, grape must, wine spirits and balsamic vinegar.

Read More thumbnail image: Fast GC runs are fine to measure volatiles in wine

New GC investigation of chiral amine separation

Date: Aug 16, 2018

Author: Ryan De Vooght-Johnson

The use of chiral GC to separate pairs of enantiomers is an important technique, but work on the factors that affect separation remains somewhat patchy. Researchers from Chulalongkorn University, Bangkok, investigated the effect of separation conditions and ring substituents on the chiral resolution of a series of 1-phenylalkylamines by GC, using a substituted cyclodextrin as the stationary phase.

Read More thumbnail image: New GC investigation of chiral amine separation

Journal Highlight: Development of a fast gas chromatography tandem mass spectrometry method for volatile aromatic compound analysis in oenological products

Date: Aug 13, 2018

Author: separationsNOW

An innovative GC‐MS/MS method useful for fast analysis of the broad aroma profile of oenological products has been developed, using a set of fifty volatile compounds belonging to the main chemical classes.

Read More thumbnail image: Journal Highlight Development of a fast gas chromatography tandem mass spectrometry method for volatile aromatic compound analysis in oenological products

GC spectra clarified when MCR technique applied

Date: Aug 13, 2018

Author: Ryan De Vooght-Johnson

The felty germander, Teucrium polium, is used as a herbal medicine, but contains a complex mixture of compounds that is difficult to analyse. Scientists from the University of Kerman and the Kerman branch of the Islamic Azad University (Iran) used GC-MS and chemometric methods (MCR-ALS and PARAFAC) to examine the components of this plant’s essential oil.

Read More thumbnail image: GC spectra clarified when MCR technique applied
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