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Journal Highlight: Chromatographic methods in HIV medicine: Application to therapeutic drug monitoring

Date: Jan 22, 2018

Author: separationsNOW

This review summarises the analytical methods relevant to therapeutic monitoring of HIV drugs, including HPLC-UV and LC-MS/MS, while highlighting respective challenges.

Read More thumbnail image: Journal Highlight Chromatographic methods in HIV medicine Application to therapeutic drug monitoring

Micrograms enough for LC on dyestuffs

Date: Jan 16, 2018

Author: Ryan De Vooght-Johnson

Various plants containing coloured alkaloids have been used as dyestuffs in the past, so there is a demand for analytical methods that can deal with small sample sizes, thus allowing the investigation of historical textiles. Scientists from Warsaw University of Technology have developed a new capillary HPLC method for these alkaloids, investigating its use with silk and wool.

Read More thumbnail image: Micrograms enough for LC on dyestuffs

LC-MS can show the way to measure hypoglycin A

Date: Jan 1, 2018

Author: Ryan De Vooght-Johnson

Atypical myopathy is a potentially fatal horse disease caused by eating toxic plant material, such as sycamore seeds. Researchers from Jena University Hospital and the FZMB Veterinary Clinic in Bad Langensalza in Germany have developed a new UHPLC-MS/MS method to quantify the relevant toxins (hypoglycin A and MPCA-carnitine) in horse serum.

Read More thumbnail image: LC-MS can show the way to measure hypoglycin A

Journal Highlight: Diagnostic accuracy of increased urinary cortisol/cortisone ratio to differentiate ACTH-dependent Cushing's syndrome

Date: Dec 18, 2017

Author: separationsNOW

HPLC-UV and LC-MS/MS have been used to measure urinary free cortisol and cortisone and the cortisol to cortisone ratio in patients with Cushing's disease and ectopic ACTH syndrome to improve diagnostic accuracy.

Read More thumbnail image: Journal Highlight Diagnostic accuracy of increased urinary cortisolcortisone ratio to differentiate ACTH-dependent Cushings syndrome

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

Olive flower phenolics finish off free radicals

Date: Dec 1, 2017

Author: Ryan De Vooght-Johnson

Olives are an important commercial crop in a number of countries, but little work has been carried out on the chemical composition of olive tree flowers. Scientists from the University of Sfax in Tunisia examined the composition of olive flowers by HPLC and LC-MS, looking at changes in the compounds present and in the overall antioxidant power of the flower extracts.

Read More thumbnail image: Olive flower phenolics finish off free radicals

Journal Highlight: Directly-coupled-column ultra-fast liquid chromatography with diode array detection method for the rapid quantification of allergenic disperse dyes in water preconcentrated by magnetic solid-phase extraction

Date: Nov 20, 2017

Author: separationsNOW

Directly-coupled-column ultra-fast liquid chromatography coupled with diode array detection for the determination of 12 allergenic disperse dyes in river water at sub-ppb levels has been developed and successfully validated.

Read More thumbnail image: Journal Highlight Directly-coupled-column ultra-fast liquid chromatography with diode array detection method for the rapid quantification of allergenic disperse dyes in water preconcentrated by magnetic solid-phase extraction

Shining a light on ionic liquid photodegradation

Date: Nov 15, 2017

Author: Ryan De Vooght-Johnson

Ionic liquids have long been touted as 'green' solvents, but relatively little work has been carried out on their degradation in the environment. Researchers from the University of Turin, Italy, examined the degradation products formed by UV irradiation of aqueous solutions of the ionic liquid 1-butyl-1-methylpiperidinium tetrafluoroborate (BMPA) using HPLC and an LTQ-Orbitrap mass spectrometer.

Read More thumbnail image: Shining a light on ionic liquid photodegradation

Drink drug’s determination in hair described

Date: Nov 1, 2017

Author: Ryan De Vooght-Johnson

The anti-spasticity pharmaceutical baclofen is being investigated as a possible treatment for alcoholics, but compliance with the course of treatment can be a problem. Researchers from the Raymond Poincaré Hospital and Necker Hospital (both in Paris) have developed a new method of measuring baclofen in the hair of treated alcoholics, using LC/MS to determine how much of the drug has been taken.

Read More thumbnail image: Drink drugs determination in hair described

Journal Highlight: Tryptophan and cysteine oxidation products dominate in α-lactalbumin-derived peptides analyzed with LC–MSn

Date: Oct 23, 2017

Author: separationsNOW

The oxidation products of tryptophan and cysteine residues in α-lactalbumin, a major milk whey protein, have been identified, which will help to monitor the safety of protein-containing foods, including food supplements for sports nutrition.

Read More thumbnail image: Journal Highlight Tryptophan and cysteine oxidation products dominate in -lactalbumin-derived peptides analyzed with LCMSn
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