Vacuum Ultraviolet Absorbance Spectra – When a Little Means a Lot

Posted by Jack Cochran on March 27, 2017

Hopefully you read my last blog post on using vacuum ultraviolet (VUV) spectroscopy as a powerful detection means for gas chromatography (GC) of terpenes.  If so, you may remember that where VUV shines (a little spectroscopy joke for you) is producing unique absorbance spectra for the various terpenes, even isomers.  Unique spectra are what allow deconvolution of coeluting GC peaks, something I know a bit about from working with time-of-flight mass spectrometers. In mass spectrometry (MS), a (mostly) unique m/z ion for each coelutingcompound is what allows a mathematical routine to get going for deconvolution, followed by plotting apexing m/z ions for each coeluting peak to get its true spectrum.  That logic has always been easy for me to wrap my mind around.  It’s also simple to see how that same MS deconvolution approach fails for coeluting isomers since isomers have essentially identical mass spectra. 

Read More

VUV Analytics / Supelco Seminar Tour

Posted by Paul Johnson on April 28, 2016

A productive three date, three city tour took place April 19th – 21st making stops in Greenbelt, MD, Wilmington, DE, and Edison, NJ.  Lindsey Shear, MS, Application Scientist at VUV Analytics, presented the theory and applications of Vacuum-Ultraviolet (VUV) Detector Technology for Gas Chromatography.  A key topic covered during her talk was how GC-VUV analysis offers a more accurate and precise water quantitation alternative to Karl Fisher and Thermal Conductivity Detection (TCD) analysis.  Len Sidisky, Ph.D., R&D Manager at Supelco, presented information about Supelco’s new line of gas chromatography columns including the Watercol 1460, 1900, and 1910. 

Each seminar location had strong representation from the food and chemical industries, as well as academic and government research.  It was clear that the VGA 100 data captivated the attention and curiosity of the audience.  A number of questions were asked regarding its capabilities and compatibility, and we would welcome any additional questions you may have.

The top five most commonly asked questions during the seminars were:

Read More