Gas Chromatography – Multimedia

Purpose: Develop a rapid, sensitive method for determining amitraz and its metabolites in milk.
Methods: Samples were hydrolyzed in acidic condition and extracted with hexane. After derivativation, the samples were analyzed by GC-ECD or directly by GC-MS.
Results: The results show that GC-MS determination of amitraz and its metabolites is rapid and sensitive.

Purpose: Exploring the possibility to perform the sample preparation steps necessary for the derivatization of analytes in a fully automated and reliable way by means of the same robotic sampler used for sample injection into the gas chromatograph.
Methods: As an example of application we screened dairy products for melamine and its derivates presence via GC-MS/MS.
Results: The outcome are good and precise results that show how it is possible to reliably automate sample preparation opera

This poster describes the analysis of several challenging pesticides from green tea samples using GC-MS/MS and acetonitrile as final extraction solvent. The compounds analysed are representatives of various classes of pesticides, such as carboxamids, OC, OP, pyrethriods, aromatic, phenylamides.

Purpose: Assess the feasibility of using analyte protectants to improve the analysis of benzodiazepines.

Purpose: We present a newly developed gas sampling valve module for the Thermo Scientific™ TRACE™ 1300 Series Gas Chromatograph (GC).

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.

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.

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.

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.

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.