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What could be causing a peak to be eluted before the column dead time?

Blood is perhaps the most widely used sample fluid in bioanalysis. Dried blood spot (DBS) sampling has been used in clinical applications for more than 50 years, but it is recently seeing a resurgence of interest. DBS sampling holds several advantages associated with the use of small sample sizes obtained via finger pricks, including simplicity and biohazard reduction. In the previous instalment, we gave an overview of microsampling in bioanalysis (1). This month, we dig deeper into bioanalysis using DBS sampling.

This month’s “GC Connections” continues the discussion of procedures for safe setup, use, and disposal of compressed gas cylinders in the chromatography laboratory.

Although enzyme immunoassay (EIA) is a prevalent screening technique, it is also prone to issues such as high false positive rates because of lack of analyte specificity. Mass spectrometry was therefore investigated as an alternative screening technique for the ability to improve analyte specificity on a comparable time scale. In this study, a rapid on-line sample preparation and injection (ROSPI) method was developed using a commercially available guard cartridge on a conventional liquid chromatography–tandem mass spectrometry (LC–MS/MS) system. Using a two-point calibration curve to provide semi-quantitation, a robust method was developed and validated that improved upon the high false positive rate observed in immunoassay screening.

The 41st International Symposium on Capillary Chromatography (ISCC) and the 14th GC×GC Symposium will return to the city of Fort Worth “Gateway to the West”, Texas, USA, in 2017.

An introduction from the guest editors of this special supplement

This article presents a selection of state-of-the-art analytical tools for mAb characterization and comparability assessment.

Click the title above to open the LCGC Asia Pacific November 2016 regular issue, Vol 19, No 4, in an interactive PDF format.

Click the title above to open the LCGC North America November 2016 Advances in Biopharmaceutical Analysis Supplement, Vol 34 No s11, in an interactive PDF format.

Click the title above to open the LCGC North America November 2016 regular issue, Vol 34 No 11, in an interactive PDF format.

Many gas chromatographers are not fully aware of safe practices for handling high-pressure gas cylinders. Gas chromatography (GC) operators should be trained to properly transport, install, connect, and maintain their gas supplies, as well as to deal with emergencies. In the first of a two-part series, this month’s “GC Connections” examines the principal hazards and safety issues surrounding the compressed gas cylinder. Next month’s instalment will present safe procedures for routine cylinder use.

A group of researchers have characterized carotenoid and chlorophyll in different sweet bell peppers using offline multidimensional supercritical fluid chromatography (SFC) combined with reversed-phase liquid chromatography (LC) for the first time.

Phenomenex has announced that it will be acquired by Danaher Corporation, a Fortune 150 science and technology company. Phenomenex will continue to operate as a standalone company, and will retain the Phenomenex brand, its personnel, and site locations.

Discovering and identifying molecular biomarkers in large liquid chromatography–mass spectrometry (LC–MS) data sets requires automation without loss of accuracy. Benjamin Van Mooy from the Wood Hole Oceanographic Institution reveals a lipidomics strategy using LOBSTAHS to identify lipid, oxidized lipid, and oxylipin biomarkers in high mass accuracy high performance (HP) LC–MS data.

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Researchers have developed a method to quantify concentrations of the pollutant tributyltin (TBT) in whole water bodies using species-specific isotope dilution (SSID) and gas chromatography with inductively coupled plasma mass spectrometry (GC–ICP-MS).

This article highlights the analytical advantages of analyzing raw milk for aflatoxins, focusing on M1, using high performance liquid chromatography (HPLC) with fluorescence detection - without derivatization. Leveraging M1’s native fluorescence, this is particularly welcome since this approach affords the requisite analytical sensitivity with minimal method complexity.

The migration of chemicals through polymeric materials is difficult or impossible to model theoretically, placing an emphasis on experimental assessment to provide reliable empirical data. This article describes an investigation into the permeation of volatile chemicals through thin polymer membranes based on dynamic headspace, and how the information generated may be of value industrially - specifically in the fields of food packaging and personal protective equipment.

Click the title above to open The Column October 24, 2016 Europe & Asia issue, Volume 12, Number 19, in an interactive PDF format.

Click the title above to open The Column October 24, 2016 North American issue, Volume 12, Number 19, in an interactive PDF format.

This application note shows the fast and simple analysis of nine cannabinoids of interest using an Agilent 1260 Infinity HPLC in an entry level setup. Results obtained from actual cannabis samples were cross validated on another system (LC–MS/MS) using UHPLC separation techniques.

I started my career working in a Quality Control laboratory. I'm familiar with the constraints that must be imposed to ensure consistent global standards and the pace at which change can be implemented without loss of control either within a business or across an industry. OK-scene set.

A group of researchers have characterized carotenoid and chlorophyll in different sweet bell peppers (Capsicum annuum L.) using offline multidimensional supercritical fluid chromatography (SFC) combined with reversed-phase liquid chromatography (LC) for the first time.

Phenomenex (Torrance, California, USA) has announced that it will be acquired by Danaher Corporation (Washington, D.C., USA), a Fortune 150 science and technology company.

This Tuesday, October 11 session of the 2016 Gulf Coast Conference will be held in room 371 D of the George R. Brown Convention Center in Houston, Texas.

A Tuesday session on process and mass spectrometers begins at 9:00 am and takes place in Room 370 D at the George R. Brown Convention Center in Houston, Texas.

The Tuesday afternoon session on gas chromatography (GC) applications includes three talks from instrument vendors.