Liquid Chromatography (LC/HPLC)

This article reviews key developments and potential advantages of using LC–MS for forensic toxicology, including the option of using oral fluid samples.

Mike Callahan, an analytical chemist at NASA's Goddard Space Flight Center (Maryland, USA), led a team to develop a new nano LC–nano ESI–MS method to detect life's building blocks in "spacedust". Callahan spoke to The Column about the inspiration behind the project, the challenges of analyzing extraterrestrial material in the laboratory, and future directions.

This article details how a newly developed ?dilute-and-shoot? sample preparation methodology for LC–MS–MS multi-residue monitoring (MRM) pesticide screening can enable operators to overcome the matrix effects that have traditionally hindered routine food analysis.

This article, transcribed from an LCGC web seminar presented on January 29, 2013, by Davy Guillarme of the University of Geneva and the University of Lyon, explains how HILIC works and provides keys to using the technique effectively.

Scientists in Malaysia have developed a useful metabolomics approach that could aid analysts working in natural drug discovery. The team applied liquid chromatography–mass spectrometry (LC–MS) coupled with principle component analysis (PCA) to screen more than 4000 natural extracts for novel photosensitizer drugs.

LC–MS Deconstructs the "Poppy Seed Defense"

This article focuses on the progression that chiral stationary phases (CSPs), specifically developed for HPLC, are currently undergoing because of the pressing need of an easy switch to UHPLC.

Michal Holcapek discusses what you need to consider when switching to a high resolution LC–MS system. Holcapek also offers advice on how to choose the most effective ionization technique for your analysis.

For proper column installation it is important to be familiar with column characteristics such as solvent compatibility, maximum flow rate, and maximum operating temperature.

To ensure an efficient, reliable, and sensitive determination of all corkiness-related off-flavour compounds in wine samples, the DLR Mosel in Germany has successfully turned to GC–MS combined with stir-bar sorptive extraction.

This article provides examples of the robustness of monolithic HPLC columns and how they can be used to help overcome the inherent challenges presented when analytes are in complex matrices.

Secondary parameters in the interface and mass analyzer can often have a major impact on sensitivity and reproducibility. This column considers how and when to consider optimizing these parameters through a study of the working principles of LC–MS analysis.

Oxycodone and its metabolites were analyzed by high performance liquid chromatography–mass spectrometry (HPLC–MS) using a diisobutyl stable bond column. This article discusses the results.

A fully automated solution was developed for the determination of THC and its metabolites THC–OH and THC-COOH in serum.

Potentially dangerous levels of the methamphetamine analogue, N, ??diethyl?phenylethylamine (N, ? -DEPEA), have been detected in a widely available dietary supplement using ultrahigh-pressure liquid chromatography coupled to mass spectrometry (UHPLC–MS). The supplement, Craze, can be bought in the USA and from on-line retailers. The findings have been published in the journal Drug Testing and Analysis by a team of scientists from Harvard Medical School (Massachusetts, USA), NSF International (Missouri, USA), and the National Institute for Public Health and the Environment Health Protection Center (Bilthoven, The Netherlands).1

There are many ways to improve retention and selectivity in reversed-phase HPLC separations. Choosing the correct mobile phase is maybe the most important step.

A number of popular myths or half-truths in UHPLC are described and data are provided that contradict some of these commonly held beliefs.

This article reviews some of the main developments that have led to recent advances in liquid chromatography–mass spectrometry (LC–MS).

This work describes a simple and sensitive high performance liquid chromatography (HPLC) method with mass spectrometry (MS) and ultraviolet (UV) detection for the analysis of mixtures of up to 32 pesticides.

"HPLC Particle Pioneer" Joseph Jack Kirkland answers questions from Gert Desmet on his pioneering career in chromatography and his interest in superfi cially porous particles (SPPs).

A summary of the results from a survey of 14 leading HPLC–UHPLC column experts is presented, covering the state of sub-2-?m porous particles, superficially porous (core–shell) particles, silica monoliths, and polymeric monoliths.

The functional principles of AF4 and HF5 are discussed.

A global lipid method has been developed using a charged aerosol detector that resolves and detects numerous classes of lipids in a single analysis. The method was used to characterize complex oil samples.

The use of UHPLC has triggered a remarkable increase in efficiency and throughput of LC and LC –MS methods. The fastest growing market segment in the pharmaceutical industry is biopharmaceuticals, with an increased interest in applying UHPLC to biopharmaceutical analysis.

Achieving a high quality sample separation is critical to the success of UHPLC analyses. Numerous practical factors must be considered to achieve this.