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Amyloidosis classification: MALDI mass spectrometric imaging

Date: Dec 15, 2017

Author: Steve Down

Scientists in Germany have used mass spectrometry imaging coupled with ion mobility separation to identify amyloid peptides in a proof-of-concept study that will allow different types of amyloidosis to be classified.

Read More thumbnail image: Amyloidosis classification MALDI mass spectrometric imaging

GC defeats AICAR sports cheats

Date: Dec 14, 2017

Author: Ryan De Vooght-Johnson

AICAR is a substance that occurs naturally in the body, but can also be used as a performance-enhancing drug in sports. Scientists from the French Anti-Doping Agency in Paris have developed an improved method for distinguishing natural AICAR from that derived from doping using GC-C-IRMS (gas chromatography, combustion, isotope ratio mass spectrometry).

Read More thumbnail image: GC defeats AICAR sports cheats

Chemometrics shown to fix complexity of herbal mix

Date: Dec 14, 2017

Author: Ryan De Vooght-Johnson

Lianqiao Baidu pills are a popular traditional Chinese medicine made from a mixture of herbal ingredients, but up to now there has been no accurate way to analyse their quality. Researchers from Shenyang Pharmaceutical University in China categorised the quality of this material using extraction, HPLC, measurements of its antioxidant power and chemometric methods.

Read More thumbnail image: Chemometrics shown to fix complexity of herbal mix

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
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