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Breaking the mould with X-ray APCI

Date: Dec 11, 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

All at sea with vanadium: Measuring the ratio of vanadium isotopes in seawater

Date: Dec 10, 2018

Author: Jon Evans

By taking advantage of ion-exchange chromatography, a team of US scientists has helped vanadium to become a useful chemical proxy for measuring past oxygen levels in the oceans.

Read More thumbnail image: All at sea with vanadium Measuring the ratio of vanadium isotopes in seawater

Journal Highlight: Rapid separation of post‐blast explosive residues on glass electrophoresis microchips

Date: Dec 10, 2018

Author: separationsNOW

Brazilian chemists have combined microchip electrophoresis with capacitively coupled contactless conductivity detection to separate and detect inorganic anions in post‐blast explosive residues.

Read More thumbnail image: Journal Highlight Rapid separation of postblast explosive residues on glass electrophoresis microchips

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

Journal Highlight: Colloidal fluorophore aggregates for the selective detection of albumins in solution and on electrophoresis gels

Date: Dec 10, 2018

Author: separationsNOW

Two chemists from Korea have developed a novel fluorescent probe for detecting serum albumins on electrophoresis gels.

Read More thumbnail image: Journal Highlight Colloidal fluorophore aggregates for the selective detection of albumins in solution and on electrophoresis gels

Journal Highlight: Optimization and validation of simultaneous analyses of ecgonine, cocaine and seven metabolites in human urine by GC-MS using a one‐step SPE

Date: Dec 10, 2018

Author: separationsNOW

Scientists in Argentina have developed a single solid-phase extraction method for deriving several cocaine metabolites from human urine, prior to analysis by gas chromatography/mass spectrometry.

Read More thumbnail image: Journal Highlight Optimization and validation of simultaneous analyses of ecgonine cocaine and seven metabolites in human urine by GC-MS using a onestep SPE

Journal Highlight: Trimethylamine N‐oxide as a risk marker for ischemic stroke in patients with atrial fibrillation

Date: Dec 5, 2018

Author: separationsNOW

Univariate and multivariate logistic regression analysis has shown that trimethylamine N‐oxide levels, measured in plasma by LC/MS/MS, are an independent predictor of ischemic stroke.

Read More thumbnail image: Journal Highlight Trimethylamine Noxide as a risk marker for ischemic stroke in patients with atrial fibrillation

Journal Highlight: TLC‐MALDI‐TOF‐MS‐based identification of flavonoid compounds using an inorganic matrix

Date: Dec 3, 2018

Author: separationsNOW

French researchers have combined thin layer chromatography with matrix‐assisted laser desorption ionisation time‐of‐flight mass spectrometry to analyze the flavonoid compounds in extracts from plants such as rose.

Read More thumbnail image: Journal Highlight TLCMALDITOFMSbased identification of flavonoid compounds using an inorganic matrix

Journal Highlight: Zero‐valent iron nanoparticles modified screen‐printed electrode for FIA or HPLC amperometric detection of metronidazole in pharmaceutical formulations

Date: Dec 3, 2018

Author: separationsNOW

Researchers from Mexico and Spain have developed an iron nanoparticles modified electrode for amperometric detection of the antibiotic metronidazole in pharmaceutical formulations.

Read More thumbnail image: Journal Highlight Zerovalent iron nanoparticles modified screenprinted electrode for FIA or HPLC amperometric detection of metronidazole in pharmaceutical formulations

Paediatric kidney transplant rejection: Peptide biomarkers

Date: Dec 1, 2018

Author: Steve Down

Kidney transplant rejection in children, specifically chronic active antibody-mediated rejection (cAMBR), can be predicted by a panel of urinary peptides, many derived from collagen species, a development that could indicate those patients who would benefit from increased immunosuppressive treatment.

Read More thumbnail image: Paediatric kidney transplant rejection Peptide biomarkers
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