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Improved detection of cefonicid with 2D HPLC

Date: Oct 15, 2017

Author: Ryan De Vooght-Johnson

Standard HPLC methods for many pharmaceuticals often use non-volatile salts, such as phosphates, which are incompatible with mass spectrometry. Scientists from Zhejiang University and Zhejiang Institute of Food and Drug Control employed two-dimensional HPLC, with phosphate being used for the first column and formate for the second, to detect novel impurities in the antibiotic cefonicid by mass spectrometry.

Read More thumbnail image: Improved detection of cefonicid with 2D HPLC

Small peaks are amplified when stochastic noise is applied

Date: Oct 15, 2017

Author: Ryan De Vooght-Johnson

Small chromatographic peaks that are hidden by baseline noise can be made clearer by employing stochastic resonance, which involves the addition of a limited amount of additional noise. Researchers from China Pharmaceutical University in Nanjing, Nanjing University of Chinese Medicine and Nanjing Changao Pharmaceutical Technology have reported an improved algorithm for the amplification of peaks using stochastic resonance, demonstrating its use with two different examples.

Read More thumbnail image: Small peaks are amplified when stochastic noise is applied

Hydrogen helps hurry harmful dioxins through GC

Date: Oct 15, 2017

Author: Ryan De Vooght-Johnson

Polychlorodibenzo-p-dioxins (PCDDs) and the related polychlorodibenzofurans (PCDFs) are toxic, persistent organic pollutants, but the current official separation methods for the various congeners are lengthy. Scientists from the Institute of Atmospheric Pollution Research in Rome developed a new GC-MS/MS method using hydrogen as the carrier gas rather than helium.

Read More thumbnail image: Hydrogen helps hurry harmful dioxins through GC

Journal Highlight: Statistical model based HPLC analytical method adjustment strategy to adapt to different sets of analytes in complicated samples

Date: Oct 9, 2017

Author: separationsNOW

HPLC data of traditional Chinese medicines acquired with design of experiments methodology were utilised to build retention models for all the analytes and interferences shown in the chromatograms with multivariate statistical modelling methods.

Read More thumbnail image: Journal Highlight Statistical model based HPLC analytical method adjustment strategy to adapt to different sets of analytes in complicated samples

Journal Highlight: Dispersive SPE for the determination of trace organochlorine pesticides in apple juices using reduced graphene oxide coated with ZnO nanocomposites as sorbent

Date: Oct 9, 2017

Author: separationsNOW

Chinese researchers used reduced graphene oxide coated with zinc oxide nanocomposites to conduct the solid-phase extraction of organochlorine pesticides from apple juice followed by gas chromatography with mass spectrometry.

Read More thumbnail image: Journal Highlight Dispersive SPE for the determination of trace organochlorine pesticides in apple juices using reduced graphene oxide coated with ZnO nanocomposites as sorbent

Journal Highlight: An approach to estimate the activation energies of fragmentation occurring in quadrupole collision cell of the mass spectrometer

Date: Oct 9, 2017

Author: separationsNOW

Hungarian chemists used the classical semi-quantitative Rice-Ramsperger-Kassel theory to calculate the fragmentation energies generated by the collision-induced dissociation reaction in tandem mass spectrometry.

Read More thumbnail image: Journal Highlight An approach to estimate the activation energies of fragmentation occurring in quadrupole collision cell of the mass spectrometer

Journal Highlight: Allergenome characterization of the mosquito Aedes aegypti

Date: Oct 9, 2017

Author: separationsNOW

An international team of researchers used 2D gel electrophoresis and Western blotting to help identify the complete set of protein allergens in the mosquito species Aedes aegypti.

Read More thumbnail image: Journal Highlight Allergenome characterization of the mosquito Aedes aegypti

Metals for the modern world: Extracting tantalum and niobium from minerals

Date: Oct 9, 2017

Author: Jon Evans

South African chemists have developed an ion exchange chromatography method for extracting the metals tantalum and niobium from minerals, which is safer and more environmentally friendly than existing methods.

Read More thumbnail image: Metals for the modern world Extracting tantalum and niobium from minerals

Journal Highlight: Effects of protein properties on adsorption and transport in polymer-grafted ion exchangers: A multiscale modeling study

Date: Oct 3, 2017

Author: separationsNOW

Chemical engineers in the US have used multiscale modeling to study how the molecular properties of a protein affect its adsorption and transport in ion exchange chromatography.

Read More thumbnail image: Journal Highlight Effects of protein properties on adsorption and transport in polymer-grafted ion exchangers A multiscale modeling study

Journal Highlight: A comparison of electrospray ionization, atmospheric pressure chemical ionization, and atmospheric pressure photoionization for the LC-MS/MS analysis of bisphenols

Date: Oct 3, 2017

Author: separationsNOW

Chemists in the US have tested the ability of three ionization methods for use with liquid chromatography-tandem mass spectrometry at analyzing biphenols in paper receipts and US dollar bills.

Read More thumbnail image: Journal Highlight A comparison of electrospray ionization atmospheric pressure chemical ionization and atmospheric pressure photoionization for the LC-MSMS analysis of bisphenols
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