Publications by authors named "Patrick Butcher"

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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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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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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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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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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

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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Are liquid chromatography/electrospray tandem quadrupole fragmentation ratios unequivocal confirmation criteria?
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Mirjam Widmer, Kevin Giles

Rapid Commun Mass Spectrom· April 2009

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False-positive liquid chromatography/tandem mass spectrometric confirmation of sebuthylazine residues using the identification points system according to EU directive 2002/657/EC due to a biogenic insecticide in tarragon.
Andreas Schürmann, Veronika Dvorak, Claudio Crüzer, Patrick Butcher, Anton Kaufmann

Rapid Commun Mass Spectrom· April 2009

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Quantitative multiresidue method for about 100 veterinary drugs in different meat matrices by sub 2-microm particulate high-performance liquid chromatography coupled to time of flight mass spectrometry.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Mirjam Widmer

J Chromatogr A· June 2008

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Ultra-performance liquid chromatography coupled to time of flight mass spectrometry (UPLC-TOF): a novel tool for multiresidue screening of veterinary drugs in urine.
Anton Kaufmann, Patrick Butcher, Kathryn Maden, Mirjam Widmer

Anal Chim Acta· March 2007

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Strategies to avoid false negative findings in residue analysis using liquid chromatography coupled to time-of-flight mass spectrometry.
Anton Kaufmann, Patrick Butcher

Rapid Commun Mass Spectrom· January 2007

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Quantitative liquid chromatography/tandem mass spectrometry determination of chloramphenicol residues in food using sub-2 microm particulate high-performance liquid chromatography columns for sensitivity and speed.
Anton Kaufmann, Patrick Butcher

Rapid Commun Mass Spectrom· March 2006

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Segmented post-column analyte addition; a concept for continuous response control of liquid chromatography/mass spectrometry peaks affected by signal suppression/enhancement.
Anton Kaufmann, Patrick Butcher

Rapid Commun Mass Spectrom· May 2005

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Trace level quantification of streptomycin in honey with liquid chromatography/tandem mass spectrometry.
Anton Kaufmann, Patrick Butcher, Pius Kölbener

Rapid Commun Mass Spectrom· January 2004

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