Publications by authors named "Andreas Helfer"

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Refined protocols of tamoxifen injection for inducible DNA recombination in mouse astroglia.
Hannah M Jahn, Carmen V Kasakow, Andreas Helfer, Julian Michely, Alexei Verkhratsky

Sci Rep· April 2018

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Liquid chromatography-high resolution-tandem mass spectrometry using Orbitrap technology for comprehensive screening to detect drugs and their metabolites in blood plasma.
Andreas G Helfer, Julian A Michely, Armin A Weber, Markus R Meyer, Hans H Maurer

Anal Chim Acta· May 2017

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Metabolic patterns of JWH-210, RCS-4, and THC in pig urine elucidated using LC-HR-MS/MS: Do they reflect patterns in humans?
Nadine Schaefer, Andreas G Helfer, Mattias Kettner, Matthias W Laschke, Julia Schlote

Drug Test Anal· April 2017

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LC-HR-MS/MS standard urine screening approach: Pros and cons of automated on-line extraction by turbulent flow chromatography versus dilute-and-shoot and comparison with established urine precipitation.
Andreas G Helfer, Julian A Michely, Armin A Weber, Markus R Meyer, Hans H Maurer

J Chromatogr B Analyt Technol Biomed Life Sci· February 2017

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The effect of renal denervation in moderate treatment-resistant hypertension with confirmed medication adherence.
Christian Ott, Felix Mahfoud, Axel Schmid, Sebastian Ewen, Stefan W Toennes, Andreas G Helfer

J Hypertens· December 2016

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Blood pressure reductions following catheter-based renal denervation are not related to improvements in adherence to antihypertensive drugs measured by urine/plasma toxicological analysis.
Sebastian Ewen, Markus R Meyer, Bodo Cremers, Ulrich Laufs, Andreas G Helfer

Clin Res Cardiol· December 2015

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Blood pressure changes after catheter-based renal denervation are related to reductions in total peripheral resistance.
Sebastian Ewen, Bodo Cremers, Markus R Meyer, Luca Donazzan, Ingrid Kindermann, Andreas G Helfer

J Hypertens· December 2015

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Metabolism of the new psychoactive substances N,N-diallyltryptamine (DALT) and 5-methoxy-DALT and their detectability in urine by GC-MS, LC-MSn, and LC-HR-MS-MS.
Julian A Michely, Andreas G Helfer, Simon D Brandt, Markus R Meyer, Hans H Maurer

Anal Bioanal Chem· October 2015

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Studies on the metabolism and toxicological detection of the new psychoactive designer drug 2-(4-iodo-2,5-dimethoxyphenyl)-N-[(2-methoxyphenyl)methyl]ethanamine (25I-NBOMe) in human and rat urine using GC-MS, LC-MS(n), and LC-HR-MS/MS.
Achim T Caspar, Andreas G Helfer, Julian A Michely, Volker Auwärter, Simon D Brandt

Anal Bioanal Chem· September 2015

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Orbitrap technology for comprehensive metabolite-based liquid chromatographic-high resolution-tandem mass spectrometric urine drug screening - exemplified for cardiovascular drugs.
Andreas G Helfer, Julian A Michely, Armin A Weber, Markus R Meyer, Hans H Maurer

Anal Chim Acta· September 2015

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Elucidation of the metabolites of the novel psychoactive substance 4-methyl-N-ethyl-cathinone (4-MEC) in human urine and pooled liver microsomes by GC-MS and LC-HR-MS/MS techniques and of its detectability by GC-MS or LC-MS(n) standard screening approaches.
Andreas G Helfer, Alain Turcant, David Boels, Séverine Ferec, Bénédicte Lelièvre

Drug Test Anal· May 2015

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No-carrier-added labeling of the neuroprotective Ebselen with selenium-73 and selenium-75.
Andreas Helfer, Johannes Ermert, Sven Humpert, Heinz H Coenen

J Labelled Comp Radiopharm· March 2015

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Witnessed drug intake before planned denervation--always harmless?
Yvonne Linicus, Ingrid Kindermann, Andreas G Helfer, Markus R Meyer, Hans H Maurer

Int J Cardiol· January 2015

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Current position of high-resolution MS for drug quantification in clinical & forensic toxicology.
Markus R Meyer, Andreas G Helfer, Hans H Maurer

Bioanalysis· August 2014

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Direct analysis of the mushroom poisons α- and β-amanitin in human urine using a novel on-line turbulent flow chromatography mode coupled to liquid chromatography-high resolution-mass spectrometry/mass spectrometry.
Andreas G Helfer, Markus R Meyer, Julian A Michely, Hans H Maurer

J Chromatogr A· January 2014

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Bis(4-benzyloxyphenyl)iodonium salts as effective precursors for the no-carrier-added radiosynthesis of 4-[¹⁸F]fluorophenol.
Andreas Helfer, Johnny Castillo Meleán, Johannes Ermert, Angelo Infantino, Heinz H Coenen

Appl Radiat Isot· December 2013

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