LCGC Europe-03-01-2017

Chromatographic techniques with mass spectrometric detection are important enablers in modern drug discovery. With the development of robust instrumentation and implementation of user-friendly software (or software packages), non-expert users can now walk up to easily accessible advanced chromatographic systems and perform experiments at their own convenience. Although remarkable improvements in robustness and ease-of-use have happened since the introduction of the first high performance liquid chromatography–mass spectrometry (HPLC–MS) systems, the instrument performance still needs to be qualified and monitored to ensure consistent high-quality results. This article will demonstrate how a simple test mixture of carefully selected compounds can facilitate both the development of generic ultrahigh-pressure liquid chromatography–mass spectrometry (UHPLC–MS) methods and automated performance monitoring of multiple instruments located in separate laboratories and buildings.

This study describes the recovery of compounds above the boiling point of naphthalene achieved by optimizing the thermal desorption chemistry for the determination of volatile organic compounds ranging from C3 to C26 in soil gas samples using Method TO-17. Figures of merit such as breakthrough, precision, linearity, and detection capability are presented, in addition to an evaluation of its real-world capability at sites with moderate diesel and semivolatile polynuclear aromatic hydrocarbon (up to pyrene) contamination, in the presence of high humidity. This research has provided a means to determine a more representative composition of soil gas.

A decade of LCGC awards has seen some of chromatography’s modern icons and rising stars honoured. In this 10th year of the award, we are pleased to honour two superb separation scientists: Pat Sandra, the winner of the 2017 Lifetime Achievement in Chromatography Award, and Deirdre Cabooter, the 2017 Emerging Leader in Chromatography. For the third consecutive year, the LCGC awards will be presented at an oral symposium held at Pittcon 2017. This year’s session, which were held on Monday 6 March, featured talks by both award winners and Milos Novotny of Indiana University, Jim Jorgenson of the University of North Carolina at Chapel Hill, and Gert Desmet of the Free University of Brussels (Vrije Universiteit Brussel).

When considering column efficiency, more is not always better. We look at some ways to quickly estimate the effects of changes in column length and particle diameter rather than trying the experiments in the laboratory.

Gas chromatographers can control several variables that affect their separations: carrier-gas flow, column temperature, column dimensions, and stationary-phase chemistry. When faced with less than optimum resolution or separation speed, a strategy of changing just one variable at a time can be more productive than trying to hit the goal in one attempt. This month’s “GC Connections” examines how to use such a plan to obtain better gas chromatography results.

Two-dimensional liquid chromatography (2D-LC) has in recent years seen an enormous evolution, and with the introduction of commercial instrumentation, the technique is no longer considered a specialist tool. One of the fields where 2D-LC is being widely adopted is in the analysis of biopharmaceuticals, including monoclonal antibodies (mAbs) and antibody–drug conjugates (ADCs). These molecules come with a structural complexity that drives state-of-the-art chromatography and mass spectrometry (MS) to its limits. Using practical examples from the authors’ laboratory complemented with background literature, the possibilities of on-line 2D-LC for the characterization of mAbs and ADCs are presented and discussed.

The second meeting of the “Emerging Separations Technologies” series, organized by The Chromatographic Society and the Royal Society of Chemistry Separation Science Group, will be held on Thursday 30 March at RSC Burlington House, Piccadilly, London.

Click the title above to open the LCGC Europe March 2017 regular issue, Vol 30, No 3, in an interactive PDF format.