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Catching cucumber crop contamination with ECD determination

Date: Sep 2, 2019

Author: Ryan De Vooght-Johnson

The organophosphate insecticide ethion can be harmful to human health so residue levels on food crops need to be monitored. Researchers from the Sher-e-Kashmir University of Agricultural Sciences (Srinagar, India) used GC with an electron capture detector (ECD) to investigate ethion residue levels on cucumbers.

Read More thumbnail image: Catching cucumber crop contamination with ECD determination

Should you calibrate TD-GC by OLC or ILC?

Date: Aug 20, 2019

Author: Ryan De Vooght-Johnson

Thermal desorption GC is often used for the analysis of volatile compounds, but the accurate introduction of reference standards can be difficult to achieve. Researchers from the University of Leuven, Belgium, investigated the losses that can occur with offline liquid calibration (OLC) methods, also examining inline liquid calibration (ILC).

Read More thumbnail image: Should you calibrate TD-GC by OLC or ILC

Journal Highlight: Headspace solid‐phase microextraction gas chromatography–mass spectrometry for the detection of volatile organic compounds released from Ganoderma boninense and oil palm wood

Date: Aug 14, 2019

Author: separationsNOW

Headspace SPME-GC/MS and chemometric analysis have been used to analyse VOCs released from Ganoderma boninense cultures and infected oil palm wood to predict the onset of Ganoderma disease and help to study plant–pathogen interactions.

Read More thumbnail image: Journal Highlight Headspace solidphase microextraction gas chromatographymass spectrometry for the detection of volatile organic compounds released from Ganoderma boninense and oil palm wood

Post-column hydrogenation gives CO determination

Date: Aug 6, 2019

Author: Ryan De Vooght-Johnson

Existing methods for the analysis of carbon monoxide and carbon dioxide either tend to be inaccurate or the instrumentation is bulky and not readily portable. Dow scientists from Philadelphia, Shanghai and Fort Saskatchewan (Alberta, Canada) developed a novel transportable GC method using a 3D-printed jet that converted the target compounds to methane prior to flame ionisation detection (FID).

Read More thumbnail image: Post-column hydrogenation gives CO determination

Journal Highlight: Assessing the chemistry and bioavailability of dissolved organic matter from glaciers and rock glaciers

Date: Jul 18, 2019

Author: separationsNOW

Differences in the bioavailability and molecular composition of dissolved organic matter in glaciers and rock glaciers have been evaluated by GC/MS-based metabolomics to assess the effect of glacier melt on alpine headwaters as warming increases.

Read More thumbnail image: Journal Highlight Assessing the chemistry and bioavailability of dissolved organic matter from glaciers and rock glaciers

What’s in my tea? See the GC

Date: Jul 16, 2019

Author: Ryan De Vooght-Johnson

A wide variety of pesticides can be used on tea plants or the harvested leaves, and the measurement of the multiple residues that may be present is challenging. Scientists from the Chinese Academy of Inspection and Quarantine and Agilent Technologies (both Beijing) developed a new method for the analysis of 184 pesticides in tea using GC coupled with time-of-flight mass spectrometry.

Read More thumbnail image: Whats in my tea See the GC

Silylated GHB examined by GC

Date: Jul 2, 2019

Author: Ryan De Vooght-Johnson

The neurotransmitter γ-hydroxybutyric acid (GHB) occurs naturally in the body, while also having legitimate medical uses and being an abused psychoactive substance. Researchers used GC/IRMS methods to examine the carbon isotope ratio of GHB in urine samples, including the effects of silylation, since this ratio can be used to distinguish between synthetic and natural GHB.

Read More thumbnail image: Silylated GHB examined by GC

GC-IRMS needs LC to give success

Date: Jun 18, 2019

Author: Ryan De Vooght-Johnson

Hexabromocyclododecane (HBCD) is a brominated flame retardant that is banned in various regions due to concerns about its environmental effects. Researchers from the Guangzhou Institute of Geochemistry (Chinese Academy of Sciences) used HPLC and GC-IRMS to examine the carbon isotope ratio of HBCD, which is useful for determining the sources of this compound.

Read More thumbnail image: GC-IRMS needs LC to give success

Journal Highlight: Comparative gas chromatographic/mass spectrometric characterization of di‐ and trialkyl phosphites

Date: Jun 18, 2019

Author: separationsNOW

Homologous series of alkyl esters of phosphorus‐containing acids, namely, dialkyl phosphonates and trialkyl phosphites, have been characterized by EI mass spectra and gas chromatographic retention indices on semi‐standard non‐polar stationary phases.

Read More thumbnail image: Journal Highlight Comparative gas chromatographicmass spectrometric characterization of di and trialkyl phosphites

Chemical ionisation for steroid sulfate determination

Date: Jun 4, 2019

Author: Ryan De Vooght-Johnson

Steroids are often converted to their sulfate derivatives in the body, and the detection of these compounds is useful for anti-doping testing in sport. Scientists from Ghent University, Belgium, devised a new GC-MS/MS method for detecting steroid sulfates.

Read More thumbnail image: Chemical ionisation for steroid sulfate determination
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