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Fungicide assay by GC gives good results with ECD

Date: Apr 9, 2018

Author: Ryan De Vooght-Johnson

The fungicide dimethachlon is widely used on rice plants in China, despite its relatively high level of kidney toxicity. Scientists from the Guizhou University (Guiyang, China) developed a new GC method using electron capture detection (ECD) to detect dimethachlon residues in paddy soil, rice straw, rice husks and rice grains.

Read More thumbnail image: Fungicide assay by GC gives good results with ECD

2D GC defeats 1D on compounds from the water flea

Date: Apr 6, 2018

Author: Ryan De Vooght-Johnson

Two-dimensional GC, where the output of one column is put through another, is a powerful technique that is being increasingly applied to complex mixtures of metabolites. Scientists from the Sharif University of Technology (Tehran) and IDAEA-CSIC (a government institute in Barcelona) compared the effectiveness of ordinary GC-MS with that of two dimensional GC plus time-of-flight MS for metabolite detection in Daphnia (water fleas), employing chemometric techniques to manipulate the data.

Read More thumbnail image: 2D GC defeats 1D on compounds from the water flea

GC is fine for compounds in wine

Date: Apr 1, 2018

Author: Ryan De Vooght-Johnson

The amount of pressing that takes place during wine production can affect the wine’s chemical composition and hence its flavour. Scientists from Turkey have compared wine made from free-run liquid (i.e. unpressed) with that produced from pressed liquid, employing GC-MS and GC-olfactometry to look at flavour compounds, while LC-MS/MS was used to examine anthocyanins.

Read More thumbnail image: GC is fine for compounds in wine

Journal Highlight: Differentiation of isomeric methylanilines by imidization and gas chromatography/mass spectrometry analysis

Date: Mar 19, 2018

Author: separationsNOW

Isomeric methylanilines can be differentiated by imidization to the N-methylbenzylidene benzenamines followed by GC/MS analysis with electron ionisation.

Read More thumbnail image: Journal Highlight Differentiation of isomeric methylanilines by imidization and gas chromatographymass spectrometry analysis

GC has met the teddy bear threat

Date: Mar 15, 2018

Author: Ryan De Vooght-Johnson

Perfume compounds are often added to soft toys by their manufacturers, but this practice may expose children to potential allergens. Scientists from the Chinese Academy of Inspection and Quarantine in Beijing devised a new method using headspace analysis and GC-MS to detect 58 possible allergens in soft toy fibres.

Read More thumbnail image: GC has met the teddy bear threat

Journal Highlight: Determining degree of roasting in cocoa beans by artificial neural network (ANN) based electronic nose system and gas chromatography/mass spectrometry (GC/MS)

Date: Mar 12, 2018

Author: separationsNOW

An electronic nose system based on an array of gas sensors and GC/MS were both used in conjunction with artificial neural networks to predict the degree of roasting of cocoa beans with equal success.

Read More thumbnail image: Journal Highlight Determining degree of roasting in cocoa beans by artificial neural network ANN based electronic nose system and gas chromatographymass spectrometry GCMS

Adulterators caught over a barrel by IRMS

Date: Mar 1, 2018

Author: Ryan De Vooght-Johnson

Ageing alcoholic spirits in wooden barrels transfers flavour compounds from the wood to the spirit, but illegal flavouring with synthetic versions of these compounds can occur. Scientists from the Edmund Mach Foundation in Italy and Charles Sturt University in Australia used GC in combination with combustion and isotope-ratio mass spectrometry (IRMS) to distinguish wood-derived vanillin from synthetic vanillin.

Read More thumbnail image: Adulterators caught over a barrel by IRMS

Pregabalin problem proved by Perugia protocol

Date: Feb 15, 2018

Author: Ryan De Vooght-Johnson

The prescription pharmaceutical pregabalin seems to be increasingly abused, but data is scarce on the amount of misuse. Scientists from the University of Perugia in Italy have developed a method of testing for pregabalin use by taking hair samples, identifying the compound by GC-MS/MS.

Read More thumbnail image: Pregabalin problem proved by Perugia protocol

Journal Highlight: Volatile organic compounds associated with milk spoilage by psychrotrophic bacteria

Date: Feb 12, 2018

Author: separationsNOW

A total of 47 volatile organic compounds belonging to seven chemical groups were identified by GC/MS in spoiled milk that had been inoculated with five psychrotrophic bacterial strains.

Read More thumbnail image: Journal Highlight Volatile organic compounds associated with milk spoilage by psychrotrophic bacteria

GC-MS defeats the doping steroid cheats

Date: Feb 2, 2018

Author:

Doping with anabolic steroids remains a significant problem in many sports, particularly since identification of these compounds and many of their metabolites is hampered by their relatively short lifetimes in the body. Scientists from Ghent University in Belgium used GC-MS with chemical ionisation to detect novel long-lived metabolites from the anabolic steroids oxymesterone and mesterolone.

Read More thumbnail image: GC-MS defeats the doping steroid cheats
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