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Tree metabolite identification combats beetle devastation

Date: Feb 1, 2018

Author: Ryan De Vooght-Johnson

The emerald ash borer is an invasive beetle that is currently destroying vast numbers of ash trees in North America. Scientists from Trent University, Peterborough and RB Consulting (both Ontario, Canada) used LC-MS to compare the metabolites from ash trees attacked by the insect with those from unaffected trees, thus providing a convenient method of early detection.

Read More thumbnail image: Tree metabolite identification combats beetle devastation

Network premiere for fumarase-insufficient cells

Date: Jan 16, 2018

Author: Ryan De Vooght-Johnson

Fumarase is an important enzyme, and work with rats suggested that low levels may affect amino acid levels and possibly be associated with hypertension. Scientists in China have examined the metabolites of human cells that had been genetically altered to be deficient in fumarase, comparing them to the metabolites from control cells using GC-MS and chemometric methods, such as pathway analysis.

Read More thumbnail image: Network premiere for fumarase-insufficient cells

Journal Highlight: Feasibility of desorption electrospray ionization mass spectrometry for diagnosis of oral tongue squamous cell carcinoma

Date: Jan 15, 2018

Author: spectroscopyNOW

DESI-MS has been used to differentiate oral tongue squamous cell carcinoma from adjacent normal epithelium using PCA-LDA of the spectra, the m/z 700–900 prediction model showing a 91% accuracy rate.

Read More thumbnail image: Journal Highlight Feasibility of desorption electrospray ionization mass spectrometry for diagnosis of oral tongue squamous cell carcinoma

Astronomically aromatic: Organics in space

Date: Jan 15, 2018

Author: David Bradley

Astronomers using information from the Green Bank Telescope and a lot of chemical nous have made the first definitive interstellar detection of benzonitrile, an aromatic molecule that could provide a missing link between simpler organic compounds and polycyclic aromatic hydrocarbons.

Read More thumbnail image: Astronomically aromatic Organics in space

Chemometrics gets to the root of TCM UHPLC data

Date: Jan 1, 2018

Author: Ryan De Vooght-Johnson

Morinda root, or ba ji tian, is commonly used in traditional Chinese medicine for a variety of conditions, but there is a lack of analytical methods that give an overall picture of the active compounds present. Researchers from the Institute of Medicinal Plant Development in China have developed a method using UHPLC to assay 11 bioactive compounds in morinda root, classifying samples by means of hierarchical cluster analysis, principal component analysis and partial least-squares discriminant analysis.

Read More thumbnail image: Chemometrics gets to the root of TCM UHPLC data

Polymorphic formulation: Chemometric tablet assessment

Date: Dec 15, 2017

Author: David Bradley

Chemometrics coupled to mid (MIR) and near (NIR) infrared spectroscopy, digital optical microscopy, differential scanning calorimetry, melting point, and dissolution properties have been used to predict the dissolution performance of different polymorphs in tablets of the widely used non-steroidal anti-inflammatory drug mefenamic acid.

Read More thumbnail image: Polymorphic formulation Chemometric tablet assessment

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

Journal Highlight: Understanding the molecular interaction in solutions by chemometric resolution of near−infrared spectra

Date: Dec 11, 2017

Author: spectroscopyNOW

A chemometric method for resolving overlapping analytical signals from components in solution based on the rotation of the loadings in PCA has been used to calculate the spectra of ethanol and water from the NIR spectra of ethanol−water mixtures.

Read More thumbnail image: Journal Highlight Understanding the molecular interaction in solutions by chemometric resolution of nearinfrared spectra

Box–Behnken design makes rhubarb extracts fine

Date: Dec 1, 2017

Author: Ryan De Vooght-Johnson

Medicinal rhubarb has long being used in traditional Chinese medicine, but accurate assays of its many active compounds are hampered by the expense of analytical standards. Scientists from Tianjin University and Tianjin University of Traditional Chinese Medicine have developed a new methods of assaying multiple rhubarb compounds by quantitative analysis of multi-components with a single marker (QAMS), while also optimising their extraction with a Box–Behnken design.

Read More thumbnail image: BoxBehnken design makes rhubarb extracts fine

CID detects triglyceride positional isomers

Date: Nov 15, 2017

Author: Ryan De Vooght-Johnson

The amount and types of triglycerides (fats and oils) in the diet are linked to a number of disease conditions, but current methods of determining the exact position of the fatty acids on the glycerol portion of these compounds are slow and cumbersome. Scientists from the University of Massachusetts Boston have devised a new method employing mass spectrometry to distinguish between the different positional isomers of triglycerides.

Read More thumbnail image: CID detects triglyceride positional isomers
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