Characterization of Styrene–Butadiene Block Copolymers by Gel Permeation Chromatography
An important feature of linear and star-like styrene–butadiene block copolymers obtained by anionic polymerization is their composition. Pyrolysis gas chromatgraphy and Fourier transform infrared spectroscopy are reliable tools to ascertain the content of styrene and butadiene, respectively. The authors of this article propose a new way of determining the composition of styrene–butadiene copolymer samples using only gel permeation chromatography. They were able to obtain the molecular mass and composition by accounting for the corrections imposed by the different hydrodynamic volumes.
LCGC 17(12), 1110–1112,1115 (1999).
Identifying and Rectifying the Misuse of Retention Indices in GC
December 10th 2024LCGC International spoke to Phil Marriott and Humberto Bizzo about a recent paper they published identifying the incorrect use of retention indices in gas chromatography and how this problem can be rectified in practice.
Investigating the Influence of Packaging on the Volatile Profile of Oats
December 10th 2024In the testing of six different oat brands, headspace sorptive extraction and comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC×GC–TOF-MS) reveal how various packaging types can affect and alter the oats’ volatile profile, underscoring the potential impact of packaging on food quality.
The Chromatographic Society 2025 Martin and Jubilee Award Winners
December 6th 2024The Chromatographic Society (ChromSoc) has announced the winners of the Martin Medal and the Silver Jubilee Medal for 2025. Professor Bogusław Buszewski of Nicolaus Copernicus University in Torun, Poland, has been awarded the prestigious Martin Medal, and the 2025 Silver Jubilee Medal has been awarded to Elia Psillakis of the Technical University of Crete in Greece.
The Benefits of DBS-GC–MS/MS in Barbiturate Detection
December 5th 2024Three analytical and two pre-treatment methods—gas chromatography–mass spectrometry (GC–MS), gas chromatography–tandem mass spectrometry (GC–MS/MS), and liquid chromatography–tandem mass spectrometry (LC–MS/MS) plus liquid-liquid extraction (LLE) and dried blood spot (DBS) —were compared for the quantitation and characterization of barbiturates.
