Publications by authors named "Stephan Walker"

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Assessment and validation of the p-QuEChERS sample preparation methodology for the analysis of >200 veterinary drugs in various animal-based food matrices.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Mirjam Widmer

Food Addit Contam Part A Chem Anal Control Expo Risk Assess· March 2023

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Simplifying Nontargeted Analysis of PFAS in Complex Food Matrixes.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Mirjam Widmer

J AOAC Int· September 2022

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Improving the QuEChERS Liquid/Liquid Extraction of Analytes With Widely Varying Physicochemical Properties: Example of 201 Veterinary Drugs in Milk.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Mirjam Widmer

J AOAC Int· June 2022

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High resolution mass spectrometry-based detection and quantification of β-agonists at relevant trace levels in a variety of animal-based food matrices.
Anton Kaufmann, Mirjam Widmer, Kathryn Maden, Patrick Butcher, Stephan Walker

Food Addit Contam Part A Chem Anal Control Expo Risk Assess· August 2021

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Partially overlapping sequential window acquisition of all theoretical mass spectra: A methodology to improve the spectra quality of veterinary drugs present at low concentrations in highly complex biological matrices.
Anton Kaufmann, Kathryn Maden, Stephan Walker

Rapid Commun Mass Spectrom· April 2020

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Analysis of a variety of inorganic and organic additives in food products by ion-pairing liquid chromatography coupled to high-resolution mass spectrometry.
Anton Kaufmann, Mirjam Widmer, Kathryn Maden, Patrick Butcher, Stephan Walker

Anal Bioanal Chem· September 2018

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Coalescence and self-bunching observed in commercial high-resolution mass spectrometry instrumentation.
Anton Kaufmann, Stephan Walker

Rapid Commun Mass Spectrom· March 2018

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Using In Silico Fragmentation to Improve Routine Residue Screening in Complex Matrices.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Mirjam Widmer

J Am Soc Mass Spectrom· December 2017

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Comparison of linear intrascan and interscan dynamic ranges of Orbitrap and ion-mobility time-of-flight mass spectrometers.
Anton Kaufmann, Stephan Walker

Rapid Commun Mass Spectrom· November 2017

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Practical application of in silico fragmentation based residue screening with ion mobility high-resolution mass spectrometry.
Anton Kaufmann, Patrick Butcher, Kathry Maden, Stephan Walker, Mirjam Widmer

Rapid Commun Mass Spectrom· July 2017

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Nested data independent MS/MS acquisition.
Anton Kaufmann, Stephan Walker

Anal Bioanal Chem· July 2016

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Improved performance of multiplexed targeted tandem mass spectrometry scans using customized Q Orbitrap data acquisition.
Anton Kaufmann, Stephan Walker

Rapid Commun Mass Spectrom· May 2016

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Determination of corticosteroids, anabolic steroids, and basic nonsteroidal anti-inflammatory drugs in milk and animal tissues.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Mirjam Widmer

J AOAC Int· May 2014

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Study of high-resolution mass spectrometry technology as a replacement for tandem mass spectrometry in the field of quantitative pesticide residue analysis.
Anton Kaufmann, Veronika Dvorak, Claudio Crüzer, Patrick Butcher, Kathryn Maden, Stephan Walker

J AOAC Int· July 2012

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Semi-targeted residue screening in complex matrices with liquid chromatography coupled to high resolution mass spectrometry: current possibilities and limitations.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Miryam Widmer

Analyst· May 2011

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Quantitative and confirmative performance of liquid chromatography coupled to high-resolution mass spectrometry compared to tandem mass spectrometry.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Stephan Walker, Miryam Widmer

Rapid Commun Mass Spectrom· April 2011

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