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Ad hoc landfill: PARAFAC of pollution risk

Date: Jul 15, 2017

Author: David Bradley

Simple landfills in developing countries represent a threat to soil and groundwater through toxic leachate. Soil column experiments to simulate pollution have been assessed using PARAFAC modelling of three-dimensional excitation-emission fluorescence to evaluate the specific risks.

Read More thumbnail image: Ad hoc landfill PARAFAC of pollution risk

DEREK peers at plethora of products in rat urine

Date: Jul 1, 2017

Author: Ryan De Vooght-Johnson

Fluvastatin is a commonly used statin compound, so it is important to carefully study its metabolites. Researchers based at the National Institutes of Pharmaceutical Education and Research in Hyderabad and S.A.S Nagar examined the metabolites of fluvastatin formed in vivo by rats, along with those formed in vitro by human or rat liver microsomes, using UHPLC-MS/MS. They subsequently ran in silico toxicity studies on these compounds.

Read More thumbnail image: DEREK peers at plethora of products in rat urine

From heartbreak to happiness with in-house MS database

Date: Jun 15, 2017

Author: Ryan De Vooght-Johnson

Gelsemium elegans is a toxic plant of interest for its possible medical uses. Scientists from Hunan Agricultural University in China used a combination of LC-MS/MS and an in-house database of the accurate masses of previously detected Gelsemium compounds to tentatively identify a wide range of the many components in a crude extract from the plant.

Read More thumbnail image: From heartbreak to happiness with in-house MS database

Precisely helium: Single molecule calibration

Date: Jun 15, 2017

Author: David Bradley

Researchers from Aarhus University in Denmark and the Institute of Science and Technology in Austria have developed a new technique for aligning molecules using lasers and ultracold droplets of helium so they can precisely measure alignment.

Read More thumbnail image: Precisely helium Single molecule calibration

Journal Highlight: Alzheimer disease classification using KPCA, LDA, and multi-kernel learning SVM

Date: Jun 12, 2017

Author: spectroscopyNOW

A novel diagnosis method for distinguishing Alzheimer disease, mild cognitive impairment and healthy states used kernel PCA followed by LDA and a a multi-kernel SVM for training and testing for detection.

Read More thumbnail image: Journal Highlight Alzheimer disease classification using KPCA LDA and multi-kernel learning SVM

Viagra cheats exposed by TLC

Date: Jun 1, 2017

Author: Ryan De Vooght-Johnson

Health supplements in some countries are frequently adulterated with PDE5 inhibitors, such as sildenafil (Viagra) or unapproved analogues. Researchers from Tianjin University of Science and Technology in China used a combination of TLC and Raman spectroscopy for the rapid identification of these pharmaceutical products in supplement samples.

Read More thumbnail image: Viagra cheats exposed by TLC

Slim chance of purity with internet herbal weight loss products

Date: May 15, 2017

Author: Ryan De Vooght-Johnson

So-called ‘herbal’ slimming aids are often adulterated with banned slimming drugs or other chemicals, to increase their effectiveness. Researchers at the Scientific Institute of Public Health in Brussels and the University of Antwerp examined several different samples of such products by UHPLC, classifying them using various chemometric methods, such as hierarchical cluster analysis (HCA), Classification and Regression Tree (CART), and partial least squares discriminant analysis (PLS-DA).

Read More thumbnail image: Slim chance of purity with internet herbal weight loss products

Journal Highlight: Non-destructive detection of dicyandiamide in infant formula powder using multi-spectral imaging coupled with chemometrics

Date: May 15, 2017

Author: spectroscopyNOW

Multi-spectral imaging at 405–970 nm coupled with back-propagation neural networks has been used successfully for the detection of dicyandiamde in infant formula powder.

Read More thumbnail image: Journal Highlight Non-destructive detection of dicyandiamide in infant formula powder using multi-spectral imaging coupled with chemometrics

Arsenic and liver: Chicken feed analysis

Date: May 15, 2017

Author: David Bradley

An analysis of mass spectrometric data reveals the existence of three toxicologically important methylated phenylarsenical metabolites in chicken liver from fowl given feed containing the additive 3-nitro-4-hydroxyphenylarsonic acid (ROX). The additive was banned in the European Union in 1999 and in the USA in 2013, but still widely used elsewhere.

Read More thumbnail image: Arsenic and liver Chicken feed analysis

SPME optimisation hits the sweet spot for sugar cane spirits

Date: May 1, 2017

Author: Ryan De Vooght-Johnson

It is important to be able to analyse the many volatile compounds in sugar cane spirit, since they are responsible for its flavour. Researchers at the Federal University of Lavras and the Federal University of the Jequitinhonha and Mucuri Valleys in Brazil optimised the extraction of these compounds by SPME, prior to GC-MS, using a central composite experimental design.

Read More thumbnail image: SPME optimisation hits the sweet spot for sugar cane spirits
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