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Analysis of Pesticide Residues in JonaGold Apples Using QuEChERS Approach and Comprehensive Two-Dimensional Gas Chromatography Time-of-Flight Mass Spectrometry (GCxGC-TOFMS)
Joe Binkley, John R Heim and Doug Staples

Screening and quantitation of pesticide residues in fruits and vegetables is of utmost importance for public health and safety concerns. These commodities can contain hundreds-to-thousands of analytes, making them extremely difficult for the screening and accurate quantitation of pesticide residues.

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Analysis of Fruit Commodities by GC-TOFMS and GCxGC-TOFMS Using QuEChERS Approach
Doug Staples, Joe Binkley and John Heim

The availability of fruit commodities from a wide variety of sources has increased the need for rapid and accurate screening for pesticides in fruit. Not all fruit commodities are brought to market under the strict guidelines of the United States Department of Agriculture. Determining whether or not the Environmental Protection Agency tolerances for various pesticides have been violated is important in the risk assessment for consumers in the United States.

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Characterization of Nutrients and Actives in Herbal Supplements and Nutriceuticals Using UHPLC-Multi-Reflecting Time-of-Flight Mass Spectrometry
Jeffrey S. Patrick, Kevin Siek and Joe Binkley

The qualitative and quantitative analysis of the content of nutritional supplements and alternative medicinal therapies is becoming more important and regulation by the FDA is imminent. High resolution mass spectrometry provides a rapid, selective, and useful mechanism for QC of extracts and finished dosage forms, producing a minable, comprehensive data set.

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Detection and Identification of Dispersants (COREXIT® 9527 and 9500) by GC/MS and LC-MS/MS
Sky Countryman, Matthew Trass, Seyed Sadjadi, Jeff Layne

Dispersants are plasticizers commonly used to prevent clumping and help dissipate oil slicks. In this work, we used GC/MS and LC-MS/ MS to detect and indentify two of the most widely used dispersants (Corexit 9527 and 9500).

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Ensuring the Quality of Registered Compounds in a Drug Discovery Environment – A Multidisciplinary Approach
Ryan Sasaki and Tara Sinclair

Lexicon Pharmaceuticals have demonstrated that a practical automated verification system using HPLC, LC/MS, and 1D and 2D NMR can be implemented in an industrial/pharmaceutical environment. This system has proven to be robust, and provides added value to compound collection integrity and quality.

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Highly Accurate Measurements of Ochratoxin A (OTA) in Different Foodstuffs
Andreas Breidbach, J. Stroka and F. Ulberth

The European Union-Reference Laboratory for Mycotoxins at the Institute of Reference Materials and Measurements of the Joint Research Centers of the European Commission regularly conducts proficiency tests to assess the measurement capabilities of the National Reference Laboratories of the EU-Member States.

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A Triple Ionization Source for LC/MS
Kaveh Jorabchi, Karl Hanold and Jack Syage

This poster reports the development of a triple ionization source consisting of ESI, APCI and APPI sources. The source uses two probes, one for ESI and a nebulizer/vaporizer for APCI and APPI.

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Dual Dopant Approach for Simultaneous LC-APPI-MS/MS Analysis of Low and High Proton Affinity Pesticides
Sheng-Suan (Victor) Cai, Kaveh Jorabchi and Jack Syage

The objectives of the work detailed in this poster was to explore dual dopant approach to maximizing APPI sensitivity for simultaneous analysis of low and high proton affinity compounds.

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Reversed-Phase Point-of-use Purifier for the Removal of Trace Organics in High Purity Water
Coralie Monferran, Cecilia Devaux, Maricar Tarun, Estelle Riche and Daniel Darbouret

Recent developments of Liquid Chromatography instrumentation, such as UHPLC coupled with mass spectrometry, have increased the separation efficiency and sensitivity. Unfortunately, there are some unwelcome consequences. One of these is the detection of trace contamination in the solvents used to prepare mobile phases. The aim of this work was to design a cartridge which produces high water quality for very sensitive LC-MS applications.

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Showing Results 41 - 50 of 100
Scientific News
Mass Spectrometry in Your Hand
Electrospray arrays can dramatically downsize systems and costs for onsite chemical analysis and many other applications.
Study Aims to Develop Breath Test for COPD
A new clinical iniative, lead by NYU Langone Medical Center, aims to determine a breath test’s effectiveness to identify volatile organic compounds (VOCs) in human breath that are biomarkers of chronic obstructive pulmonary disease (COPD).
Comparison of Caffeinated and Decaffeinated Coffee - Implications for Alzheimer's Disease
Researchers from the National University of Singapore successfully demonstrated the viability of GC-TOF-MS as an analytical platform for metabolomics analysis of coffee samples.
Repressing the Repressors May Drive Tissue-Specific Cancers
Stowers scientists establish Drosophila and mammalian models to study mutations found in pediatric brain tumors.
Embalming Study ‘Rewrites’ Key Chapter in Egyptian History
New evidence to suggest that the origins of mummification started in ancient Egypt 1,500 years earlier than previously thought.
Identification of Psoriatic Arthritis Mediators in Synovial Fluid
This study represents the most comprehensive proteomic analysis of psoriatic arthritis synovial fluid, to date.
Mass Spec-Based Metabolomics Workflows to Evaluate Plant Immunity
This article reviews metabolomics studies used to evaluate plant immunity with an emphasis on mass spectrometry in its many forms.
Using LC-MS to Analyse Sulfonamides in Food Grade Honey
Sulfonamides are one of a number of groups of chemicals whose presence in honey is limited by international regulations.
Reimagining UHPLC
To learn more about the new Vanquish UHPLC system from Thermo Fisher Scientific we spoke to Wulff Niedner, Director of HPLC Product Marketing.
Mass Spec Predicts Improved Response to Anti-HER2 Therapy in Breast Cancer
Immunohistochemistry is the standard technique for detecting HER2 protein expression, it does not provide absolute quantification of this receptor and is prone to false-positives.
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