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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

Journal Highlight: Molecular identification of Asian lacquers from different trees using Py‐GC/MS and ToF‐SIMS

Date: Jul 16, 2018

Author: separationsNOW

Pyrolysis-GC/MS and ToF-SIMS have been used to characterise lacquers from the Asian trees Toxicodendron vernicifluum from China, Japan, and Korea, Toxicodendron succedaneum from Vietnam and Gluta usitata from Myanmar.

Read More thumbnail image: Journal Highlight Molecular identification of Asian lacquers from different trees using PyGCMS and ToFSIMS

Beer’s volatile fraction caught by microextraction

Date: Jul 11, 2018

Author: Ryan De Vooght-Johnson

The various volatile compounds in beer are important for determining its flavour so accurate analytical methods for their quantification are essential. Researchers from the University of Chemistry and Technology, Prague, used solid-phase microextraction (SPME) and GC-MS to detect volatile beer compounds, optimising t he extraction using a central composite experimental design.

Read More thumbnail image: Beers volatile fraction caught by microextraction

Journal Highlight: Evaluation of coal‐related model compounds using a tandem mass spectrometry

Date: Jun 18, 2018

Author: separationsNOW

A tandem mass spectrometric technique using GC/Q‐TOFMS has been established for the selection of precursor ion/product ion pairs for monitoring coal conversion products.

Read More thumbnail image: Journal Highlight Evaluation of coalrelated model compounds using a tandem mass spectrometry

Headspace GC and TCD give water absorption capacity

Date: Jun 15, 2018

Author: Ryan De Vooght-Johnson

The water absorption capacity of flour is an important characteristic that is normally measured by filtration techniques, which can be awkward to use. Scientists from the South China University of Technology (Guangzhou, China) and the Health Supervision Bureau of Liaoning Province (Shenyang, China) developed a novel method of determining the water absorption capacity of wheat flour using headspace GC technology and a thermal conductivity detector (TCD).

Read More thumbnail image: Headspace GC and TCD give water absorption capacity
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