Exploring the Ionization Space in Traditional Electron Ionization with High Resolution GC=TOFMS for a Variety of Compound Classes
Poster Jun 19, 2014
Jonathan D. Byer, David Alonso, Joe Binkley, Charles Lyle, and Jeff Patrick
Recommended source conditions for contributing electron ionization (EI) mass spectra to commercial libraries are ionization energy of 70 eV and an ion source temperature of 200°C. However, spectral quality is affected by other source parameters, such as filament emission current and differences in instrument manufacturers’ source design.
The primary objective of this study was to optimize LECO’s GC-HRT EI source parameters to enhance the molecular ion of thermally labile compounds like linear alkanes, fatty acid methyl esters, and pesticides.
The secondary objective was to optimize the EI source for other classes of compounds to achieve a global optimum for non-targeted analysis, since this is the primary utility of most time-of-flight mass spectrometry (TOFMS) systems.
Fundamentals and Comparisons for Organic Sample Extract EvaporationPoster
Sample preparation is a key step in the analysis process
Parameters for evaporation and their impact on analysis have been discussed
Improvements in matching the sample to the evaporation device characteristics can help reduce variability and improve recovery
Examples for choosing a system based on sample volume, types of analytes, sample load, and initial investment considerations
Using Elemental Analysis For Discrimination Of Pinot Noir Wines From Six Different Districts In An AvaPoster
The determination of geographical origin of wine is gaining increased interest by researchers and federal agencies around the world, partially due to increased fraud with regards to place of origin labelling. For wine, multi-elemental profiling of macro, micro, and trace elements has been proposed for determination of authenticity. Commercial wines from different wineries in 5 different neighborhoods within one AVA show characteristic elemental fingerprints. Macro, micro and trace elements as well as elemental ratios contribute to the observed separation, indicating the involvement of multiple factors and underlying mechanisms, including location and soil composition, elemental uptake by vine and rootstock, viticulture and nutrient management, water sources, and small differences in the different wineries.READ MORE
Fast arsenic speciation analysis of wines and rice with LC-ICP-QQQPoster
This method was designed in response to recent and proposed food standards, both international and national, that limit inorganic arsenic rather than total, organic, or individual arsenic species such as arsenite (AsIII) and arsenate (AsV). Analysis time is 10x faster than the current FDA regulatory method, increasing sample throughput, avoided spectral interferences and dramatically increased sensitivity. Validation data from two laboratories demonstrate the method’s accuracy and reproducibility of both wine and rice matrices in a single analytical batch.READ MORE