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Gas Chromatography – Multimedia

GC-MS/MS Analysis of Pesticide Residue in Green Tea Extracted by QuEChERS with Acetonitrile as Final Solvent content piece image
Poster

GC-MS/MS Analysis of Pesticide Residue in Green Tea Extracted by QuEChERS with Acetonitrile as Final Solvent

QuEChERS involves an initial step when a few grams of the sample are extracted with acetonitrile followed by a clean-up step (with dispersive-SPE) used to remove, to a certain extent, unwanted matrix compound (such as pigments, sugars, organic acids). With QuEChERS, the final extract ends up with the pesticides in acetonitrile, which, being polar solvent, can be
problematic in GC-MS.
Automated Solid-Phase Extraction of Oraganochlorine Pesticides from Drinking Water content piece image
Poster

Automated Solid-Phase Extraction of Oraganochlorine Pesticides from Drinking Water

A new method was developed to automate the capture and elution of Organochlorine pesticides from drinking water. The concentrated analytes were then analyzed by GC with Electron Capture Detection (ECD).
Analysis of Multiresidue Pesticides Present in Ayurvedic Churna by GC-MS/MS content piece image
Poster

Analysis of Multiresidue Pesticides Present in Ayurvedic Churna by GC-MS/MS

Analysis of Herbal powders or ‘churnas’ using an optimized GC-MS/MS method is described. As they have high amount of matrix co-extractives, they pose critical analytical problems. The purpose of this work was overcome the effect of the matrix and develop a reliable method.
Analysis of Dithiocarbamate Pesticides by GC-MS content piece image
Poster

Analysis of Dithiocarbamate Pesticides by GC-MS

Analysis of dithiocarbamate pesticides (DTCs) using an optimized GC-MS method is described. DTCs are not stable and cannot be extracted or analyzed directly. The purpose of this work was develop a reliable method for identification and quantification of residues.
Identifying Unknown Chemicals and Disinfection Byproducts in Swimming Pools and Hot Tubs content piece image
Poster

Identifying Unknown Chemicals and Disinfection Byproducts in Swimming Pools and Hot Tubs

DBPs were identified in finished water, tap water, swimming pool water, and hot tub water that were not present in the source water. High Resolution Deconvolution was used effectively to identify a greater number of peaks in the chromatogram than by nominal resolution MS.
Strategic Utilization of Gas Chromatography with Both Nominal and High Resolution Time-of-Flight Mass Spectrometers for Metabolomic Studies content piece image
Poster

Strategic Utilization of Gas Chromatography with Both Nominal and High Resolution Time-of-Flight Mass Spectrometers for Metabolomic Studies

The Pegasus series of mass spectrometers are indispensable tools for metabolomics research:
-Throughput
-Discovery
-Confirmation
GC-HRT analyses resulted in confident metabolite identifications:
-Spectral similarity searches
-Formulae for fragment, molecular, and adduct ions
Myth Busters: The Truth About Metabolomics and High Resolution Gas Chromatography Time-of-Flight Mass Spectrometry content piece image
Poster

Myth Busters: The Truth About Metabolomics and High Resolution Gas Chromatography Time-of-Flight Mass Spectrometry

The data summarized in this presentation dispels myths associated with the utilization of GC-MS for analytes which are critical for metabolomic studies. GC-HRT provides high quality, accurate mass data for:
-Spectral similarity searches (NIST, Wiley, etc.)
-Formula determination (fragment, molecular & adduct ions)
-GC-HRT is an indispensible tool for the analysis of complex biological samples.
High Performance Time-of-Flight Mass Spectrometry for Comprehensive Petroleum Analysis content piece image
Poster

High Performance Time-of-Flight Mass Spectrometry for Comprehensive Petroleum Analysis

High Resolution GC-TOFMS and GC×GC-TOFMS are useful for a non-target comprehensive characterization of petroleum through a petroleomic approach, and can also provide targeted analysis of chemical markers.

High Resolution GC-TOFMS 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.
Characterization of Complex Forensic Samples by Gas Chromatography--High Resolution Time-of-Flight Mass Spectrometry content piece image
Poster

Characterization of Complex Forensic Samples by Gas Chromatography--High Resolution Time-of-Flight Mass Spectrometry

Proper sample preparation is critical for the analysis of complex samples. GC-HRT provides high quality, accurate mass data for:
-Spectral similarity searches (NIST, Wiley, etc.)
-Formula determination (fragment, molecular, and adduct ions)
Characterization of Metabolites From Medicago truncatula Using Gas Chromatography Mass Spectrometry—Addressing the Knowns and Unknowns Using High Resolution Time-of-Flight content piece image
Poster

Characterization of Metabolites From Medicago truncatula Using Gas Chromatography Mass Spectrometry—Addressing the Knowns and Unknowns Using High Resolution Time-of-Flight

Analyses of the M. truncatula extracts were performed, and data processing focused on qualitative analyses. This provided the opportunity for known analyte verification and unknown identification in a meaningful matrix and the demonstration of the key attributes and benefits of GC-HRT.
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