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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

UHPLC and Chemometrics Tease out Teasel’s Active Compounds

Date: Apr 17, 2017

Author: Ryan De Vooght-Johnson

Dipsacus apser, or Japanese teasel, is commonly used in Chinese herbal medicine, often after rinsing with wine and then boiling with water. Researchers from Nanjing University of Chinese Medicine compared the differences between the composition of the raw herb and wine-processed material, using UHPLC-MS/MS and the chemometric methods PCA, HCA and PLS-DA.

Read More thumbnail image: UHPLC and Chemometrics Tease out Teasels Active Compounds

Journal Highlight: UV/Vis spectroscopy combined with chemometrics for monitoring solid-state fermentation with Rhizopus microsporus var. oligosporus

Date: Apr 17, 2017

Author: spectroscopyNOW

Partial least squares and artificial neural network models have been presented for inferring protease and amylase activities from UV–vis spectra of samples removed during solid-state fermentation using Rhizopus microsporus var. oligosporus.

Read More thumbnail image: Journal Highlight UVVis spectroscopy combined with chemometrics for monitoring solid-state fermentation with Rhizopus microsporus var_ oligosporus

Biodiesel analysis: Biofuel blend by NMR spectroscopy

Date: Apr 15, 2017

Author: David Bradley

A new quantitative method of analysing the biodiesel in a diesel-biodiesel blend using proton nuclear magnetic resonance (NMR) spectroscopy has been developed by researchers in Brazil. The resulting spectra are subjected to a univariate calibration in which the integrals of the spectra are considered. Statistical comparison with infrared (IR) spectra corroborate the findings.

Read More thumbnail image: Biodiesel analysis Biofuel blend by NMR spectroscopy

New MOGO optimisation algorithm wins at Monte Carlo

Date: Apr 2, 2017

Author: Ryan De Vooght-Johnson

Optimisation of conflicting objectives, such as yield and purity, has long been a problem in process optimisation. Researchers from the Forschungszentrum Jülich in Germany have developed an improved optimisation algorithm, MOGO, which they applied to the simulated separation of a protein by ion-exchange chromatography.

Read More thumbnail image: New MOGO optimisation algorithm wins at Monte Carlo

Journal Highlight: Classification of lignocellulosic biomass by weighted-covariance factor fuzzy C-means clustering of mid-infrared and near-infrared spectra

Date: Mar 20, 2017

Author: spectroscopyNOW

A weighted-covariance factor fuzzy C-means clustering method combined with bootstrapping has been proposed for analysing the mid-IR and near-IR spectra of small samples of biomass.

Read More thumbnail image: Journal Highlight Classification of lignocellulosic biomass by weighted-covariance factor fuzzy C-means clustering of mid-infrared and near-infrared spectra

Catching makers of crystal meth by chemometrics

Date: Mar 15, 2017

Author: Ryan De Vooght-Johnson

Identifying impurities in the illegal drug N-methylamphetamine, a.k.a. methamphetamine or crystal meth, can help law enforcement agencies detect the likely source and the synthetic route used. Scientists from the Chemistry and Chemical Engineering Research Centre of Iran used chemometric methods to detect trace impurities hidden under the large main peak in pure samples of seized methamphetamine.

Read More thumbnail image: Catching makers of crystal meth by chemometrics
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