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Feeling supersonic: SMB analysis of petroleum fractions

Date: Apr 16, 2019

Author: Ryan De Vooght-Johnson

Oxygenation of heavy petroleum fractions can produce more valuable products, but the analysis of the resultant complex mixture is challenging owing to the many species present. Researchers from Sasol’s laboratories in Sasolburg (South Africa), the University of Pretoria and Tel Aviv University used initial purification by solid-phase extraction or supercritical fluid chromatography followed by separation by GC-MS with supersonic molecular beams to separate a mixture of oxygenated petroleum...

Read More thumbnail image: Feeling supersonic SMB analysis of petroleum fractions

Journal Highlight: An analytical method for the analysis of trihalomethanes in ambient air using solid‐phase microextraction gas chromatography‐mass spectrometry: An application to indoor swimming pool complexes

Date: Apr 16, 2019

Author: separationsNOW

A simple method for the collection and GC/MS analysis of the four brominated and chlorinated trihalomethanes in air samples has been developed and applied to indoor air from swimming pools.

Read More thumbnail image: Journal Highlight An analytical method for the analysis of trihalomethanes in ambient air using solidphase microextraction gas chromatographymass spectrometry An application to indoor swimming pool complexes

Protectant permits precise pesticide appraisal

Date: Apr 2, 2019

Author: Ryan De Vooght-Johnson

The insecticide buprofezin is widely used on vegetables, fruit and rice, but determination of the residue levels in crops can be challenging. Scientists from the Agricultural Research Centre at Giza, (Egypt) and the Food Safety Laboratory at Buraydah (Saudi Arabia) used GC-MS, along with the addition of d-sorbitol to supress matrix effects, to determine buprofezin residues in cabbage and cauliflower.

Read More thumbnail image: Protectant permits precise pesticide appraisal

Journal Highlight: Urine metabolic profiles in paediatric asthma

Date: Mar 19, 2019

Author: separationsNOW

Candidate biomarkers specific to paediatric asthma have been determined in urine by GC/MS to provide insights into asthmatic pathophysiology with the aid of network biology approaches.

Read More thumbnail image: Journal Highlight Urine metabolic profiles in paediatric asthma

Headspace GC finds the dimers that are left behind

Date: Mar 18, 2019

Author: Ryan De Vooght-Johnson

Spray-drying using acetone as solvent is a common method for the preparation of pharmaceuticals, but the formation of less volatile dimeric-type compounds, such as diacetone alcohol and mesityl oxide, from the acetone is a problem. Merck scientists, based at their Rahway (New Jersey) and West Point (Pennsylvania) sites, optimised headspace GC conditions for the analysis of these acetone-derived compounds. 

Read More thumbnail image: Headspace GC finds the dimers that are left behind

Sea bug lactones clear to see by using IR and GC

Date: Mar 6, 2019

Author: Ryan De Vooght-Johnson

The non-volatile natural products of Salinispora bacteria, a group of marine microorganisms, have been investigated, but little work has been carried out on their volatile natural products. A group of scientists from the Technical University of Brunswick, Germany, and the University of California San Diego used a combination of GC-MS, GC-IR and chemical synthesis to identify novel volatile lactones from Salinispora.

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Proposed propofol protocol permits brain detection

Date: Mar 5, 2019

Author: Ryan De Vooght-Johnson

The intravenous anaesthetic propofol is widely used, but up to now it has not been possible to measure its concentration in living brains. A combination of cerebral microdialysis, direct immersion solid-phase microextraction (DI-SPME) and GC-MS/MS was used to analyse propofol levels in cerebral fluid. 

Read More thumbnail image: Proposed propofol protocol permits brain detection

Journal Highlight: Optimization of headspace for GC‐MS analysis of fragrance allergens in wooden children's products using response surface methodology

Date: Feb 21, 2019

Author: separationsNOW

A simple and green method was developed for the determination of volatile chemicals, especially the 48 fragrance allergens in wooden children's products, using static headspace coupled with gas chromatography and mass spectrometry.

Read More thumbnail image: Journal Highlight Optimization of headspace for GCMS analysis of fragrance allergens in wooden childrens products using response surface methodology

Petroleum base oil: Which method gives best ionisation in GC-MS determination?

Date: Feb 19, 2019

Author: Ryan De Vooght-Johnson

Base oils are fractions derived from crude oil that are then used as the main components in lubricating oils, but the analysis of these complex mixtures remains a challenge. A multi-centre team of researchers compared four different GC×GC-MS methods for base oil analysis: electron ionisation, chemical ionisation, photo-ionisation and field ionisation.

Read More thumbnail image: Petroleum base oil Which method gives best ionisation in GC-MS determination

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
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