Gas Chromatography – Multimedia

Poster
GC-MS/MS ANALYSIS OF BENZODIAZEPINES USING ANALYTE PROTECTANTS
Purpose: Assess the feasibility of using analyte protectants to improve the analysis of benzodiazepines.

Poster
Instant Connect Gas Sampling Valve Module Introducing a New Flexibility in Gas Sampling for GC and GCMS
Purpose: We present a newly developed gas sampling valve module for the Thermo Scientific™ TRACE™ 1300 Series Gas Chromatograph (GC).

Poster
Characterization of Persistent Organic Pollutants in Suspended Sediments by Thermal Desorption Coupled to GCxGC-TOFMS
Thermal desorption coupled to GC×GC-TOFMS was an effective tool for enhancing the number of compounds identifiable in suspended sediment without wet chemistry. Identified >100 additional PAHs and alkyl-PAHs than the list currently monitored.

Poster
Characterization and Quantification of Essential Oils by GC and GCxGC with TOFMS and FID
Chamomile essential oils were analyzed by GC and GC×GC with both FID and TOFMS. A method was determined that reduced the analysis time from nearly two hours to just over 20 minutes without a relative increase in coelution. This was achieved by pairing a complementary secondary separation with GC×GC to a fast primary column temperature program.

Poster
The Characterization of Flavored Tobacco with GCxGC-TOFMS
The experiments described in this poster demonstrate a food, flavor, and fragrance analysis for the characterization of the aroma and flavor analytes in tobacco. Natural flavors and additives were readily determined. HS-SPME sampling pre-concentrated the volatile and semi-volatile compounds and a GCxGC-TOFMS method separated and detected components in tobacco, including known additives and naturally occurring flavor analytes.

Poster
Characterization of Food Products by GCxGC-TOFMS and GC-High Resolution TOFMS: A Food "omics" Approach
This poster has demonstrated the broad applicability of GC and TOFMS in the food and beverage industry with highlighted examples from edible oils, hops, and beer. HS-SPME was used to pre-concentrate and collect volatile and semi-volatile analytes from each sample for analysis by LECO’s Pegasus 4D, HT, and/or HRT. This type of information provides food “omics” insight at various stages throughout production, including differentiation of raw materials, process changes, and finished products.

Poster
Potential Benefits of Comprehensive Two=Dimensional Gas Chromatography — High Resolution Time-of-Flight Mass Spectrometry (GCxGC-HRTOFMS)
Preliminary results of a resarch prototype GC×GC-HRTOFMS demonstrate that more confident peak identifications can be made as compared to GC-HRTOFMS and GC×GC-TOFMS nominal mass. This was possible due to the high mass accuracy, high mass resolution, and high data acquisition rate of the mass spectrometer, and the high performance of the GC×GC system.

Poster
Crude Oil And Asphaltene Characterization by Pyrolysis Coupled to Gas Chromatography High Resolution Time-of-flight Mass Spectrometry
Py-GC-HRTOFMS analysis with high resolution and high mass accuracy is crucial for identification of crude oil and asphaltene pyrolysis products by unequivocal chemical formula assignment, with enhancement of sensitivity and selectivity. Analysis of petroleum and respective asphaltene fractions from diverse geographical origins are under evaluation as part of future work.

Poster
GC-MS Comparison of Lavindin Grosso Oil Obtained by Steam Distillation and SFE
Oil was extracted from Lavindin Grosso using steam distillation and using supercritical fluid extraction (SFE). Multiple analyses of the same extract demonstrated repeatability of the analytical method. The variability between batches of distillate bracketed the composition obtained by SFE. The differences among the oils could be attributed more to where the lavender was grown than to the extraction method.

Poster
Isolation, Identification, and Determination of Designer Anabolic Steroids Commonly Found in Dietary Supplements
A general analytical approach in identifying emerging steroid-like compounds is presented, including analysis by GC-MS, LC-MS, and/or HPLC-UV. Isolation of unknown compounds was achieved by high performance liquid chromatography with fraction collection. Isolated compounds were characterized by Nuclear Magnetic Resonance spectroscopy and high resolution accurate mass-mass spectrometry to elucidate their structure.
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