LCGC Europe-01-01-2007

LCGC Europe
Column Watch

January 01, 2007

In any field there are often "misconceptions" or "myths" that are perpetuated and passed on to the next generation. These myths are often driven by a lack of understanding by practitioners of the real issues. In this instalment of "Column Watch", the 10 most popular myths around high performance liquid chromatography (HPLC) column technology will be demystified by discussing the issues at hand. Among some of the popular myths that will be dispelled are that "All C18 (L1) columns are the same", "You can't reverse an HPLC column", "High temperature always leads to better separations" and "The higher the carbon load the better the reversed-phase column".

This article describes and compares a number of approaches to increase the speed of liquid chromatographic separations. On a standard LC column, a gain of a factor two in the run time (from 10 to 5 minutes) was achieved by increasing the flow-rate two-fold. On a monolithic column, a column operated at high temperature (120 ?C) and a short column, flow-rates could be increased typically five-fold, resulting in run times in the order of 2 minutes. This was accompanied by a sometimes considerable loss in separation efficiency. A combination of a very short run time and unaffected separation efficiency was realized on a UPLC system, designed for use at higher pressure. By working at approximately 800 bar, the analytes could be well separated within 30 seconds.

LCGC Europe
New Technologies

January 01, 2007

Star gazing will be made easy with a new handheld device, known as the SkyScout, that uses advanced GPS technology with point and click convenience to identify thousands of stars, planets and constellations.

Gas chromatography (GC) coupled to time-of-flight mass spectrometry (TOF-MS) offers unique solutions for various analytical applications including the analysis of food quality, authenticity and safety markers. This article provides a general overview of TOF-MS basic features, highlighting its advantages and limitations compared with GC using conventional mass analysers. Examples of recent results obtained for selected food contaminants and flavour components are described to illustrate the potential of this recently introduced technique.

LCGC Europe
LC Troubleshooting

January 01, 2007

This month's instalment of "LC Troubleshooting" presents two examples of sample degradation inside the liquid chromatography (LC) column. Depending upon the type of samples you analyse, sample degradation might or might not be a problem that you encounter regularly. However, most of us run a sufficiently wide variety of sample types over our careers that we will probably run into some samples that do not behave as expected.

LCGC Europe

Although interpreting MS spectra can be a thorny problem at least some of the time, in the words of Fred McLafferty, "All you are dealing with is the mass of the molecule and the masses of the pieces."

LCGC Europe

MIP Technologies has signed an exclusive global distribution agreement with Supelco, a division of Sigma-Aldrich. The agreement is for the distribution of analytical and preparative molecularly imprinted polymer (MIP) separation products.