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Acetic acid additive best for negative ESI

Date: Dec 13, 2017

Author: Ryan De Vooght-Johnson

There is little consensus about the best additives to use for LC-MS negative electrospray ionisation (negative ion ESI). Scientists from Concordia University, Montreal, compared the effects of acetic acid, ammonium hydroxide and ammonium acetate on LC-MS negative ion ESI using mixtures of lipid standards and also extracted human lipids.

Read More thumbnail image: Acetic acid additive best for negative ESI

Journal Highlight: Determination of cyclic volatile methylsiloxanes in personal care products by gas chromatography

Date: Dec 11, 2017

Author: separationsNOW

A simple GC-FID method has been developed to enable accurate measurement of low levels of octamethylcyclotetrasiloxane (D4) and decamethylcyclotetrasiloxane (D5) in personal care products.

Read More thumbnail image: Journal Highlight Determination of cyclic volatile methylsiloxanes in personal care products by gas chromatography

Into the unknown: Novel method for screening water for unknown contaminants

Date: Dec 11, 2017

Author: Jon Evans

A novel method based on ion-exchange chromatography and high-resolution mass spectrometry can not only identify known contaminants in drinking water, but can also be used to reveal unknown contaminants.

Read More thumbnail image: Into the unknown Novel method for screening water for unknown contaminants

Journal Highlight: Determination of tanshinones in Danshen (Salvia miltiorrhiza) by HPLC with fluorescence detection after pre-column derivatisation

Date: Dec 11, 2017

Author: separationsNOW

Scientists in Japan have developed a derivatization method for detecting tanshinones, a major class of bioactive ingredients in the medical herb Danshen, by high-performance liquid chromatography with fluorescence detection.

Read More thumbnail image: Journal Highlight Determination of tanshinones in Danshen Salvia miltiorrhiza by HPLC with fluorescence detection after pre-column derivatisation

Journal Highlight: Derivatization agents for electrochemical detection in amino acid, peptide and protein separations: The hidden electrochemistry?

Date: Dec 11, 2017

Author: separationsNOW

This review covers electrochemical derivatization reagents and electrochemical tags employed for amino acids, peptides and proteins in separation techniques.

Read More thumbnail image: Journal Highlight Derivatization agents for electrochemical detection in amino acid peptide and protein separations The hidden electrochemistry

Journal Highlight: Investigation of maltodextrin-based synergistic system with amino acid chiral ionic liquid as additive for enantioseparation in CE

Date: Dec 11, 2017

Author: separationsNOW

Chinese chemists have investigated the potential of combining tetramethylammonium-L-arginine, a kind of amino acid chiral ionic liquid, with maltodextrin for separating enantiomers by capillary electrophoresis.

Read More thumbnail image: Journal Highlight Investigation of maltodextrin-based synergistic system with amino acid chiral ionic liquid as additive for enantioseparation in CE

Journal Highlight: Direct determination of δ44/42Ca isotope ratio by ion chromatography/low-resolution multicollector ICPMS

Date: Dec 5, 2017

Author: separationsNOW

Polish chemists developed an ion chromatography method for measuring calcium isotopic ratio and tested it on samples of water, bone and coral.

Read More thumbnail image: Journal Highlight Direct determination of 4442Ca isotope ratio by ion chromatographylow-resolution multicollector ICPMS

Journal Highlight: Comparison of linear intrascan and interscan dynamic ranges of Orbitrap and ion-mobility time-of-flight mass spectrometers

Date: Dec 5, 2017

Author: separationsNOW

Swiss food scientists have investigated the linear intrascan and interscan dynamic ranges of high-resolution mass spectrometers when analyzing metabolites in complex samples.

Read More thumbnail image: Journal Highlight Comparison of linear intrascan and interscan dynamic ranges of Orbitrap and ion-mobility time-of-flight mass spectrometers

Journal Highlight: Metabolomics revealed the toxicity of cationic liposomes in HepG2 cells using UHPLC-Q-TOF/MS and multivariate data analysis

Date: Dec 4, 2017

Author: separationsNOW

The underlying mechanism of cytotoxicity on HepG2 cells of cationic liposomes, used in drug and gene delivery has been studied by LC/MS supported by multivariate data analysis and statistics.

Read More thumbnail image: Journal Highlight Metabolomics revealed the toxicity of cationic liposomes in HepG2 cells using UHPLC-Q-TOFMS and multivariate data analysis

Monitoring bone fracture healing: Protein signals

Date: Dec 1, 2017

Author: Steve Down

Scientists in the USA have uncovered a suite of proteins in serum that might be able to follow the progression of fracture healing and lead to the development of treatments to accelerate the process.

Read More thumbnail image: Monitoring bone fracture healing Protein signals
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