Frank‐Michael Matysik

University of Regensburg

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Rudolf Bierl

Regensburg University of Applied Sciences

Thomas Rück

Regensburg University of Applied Sciences

Ana Maria Oliveira‐Brett

University of Coimbra

Ulli Backofen

University of Kansas

Stefan Weigl

Regensburg University of Applied Sciences

Christian Iffelsberger

Brno University of Technology

Jonas Pangerl

University of Regensburg

Silke Matysik

University Hospital Regensburg

Simon Jobst

University of Regensburg

W. Hoffmann

Karlsruhe Institute of Technology

Cooperative Institutions

University of Regensburg

Leipzig University

Charles University

Czech Academy of Sciences

Czech Academy of Sciences, Institute of Analytical Chemistry

Czech Academy of Sciences, Institute of Physics

Regensburg University of Applied Sciences

Central European Institute of Technology

Karlsruhe Institute of Technology

Brno University of Technology

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Nonaqueous capillary electrophoresis with indirect electrochemical detection

Electrophoresis (2002)

Frank‐Michael Matysik Daniela Marggraf Petra Gläser J. A. C. Broekaert

Nonaqueous capillary electrophoresis (NACE) which makes use of organic solvents in place of conventional aqueous electrophoresis buffers is gaining increasing importance among modern separation techniques. Recently, it has been shown that amperometric detection in conjunction with acetonitrile-based NACE offers an extended accessible potential range and an enhanced long-term stability of the amperometric responses generated at solid electrodes. The present contribution takes advantage of the latter aspect to develop reliable systems for NACE with indirect electrochemical detection (IED). In this context, several compounds such as (ferrocenylmethyl)trimethylammonium perchlorate, tris(1,10-phenanthroline)cobalt(III) perchlorate and bis(1,4,7-triazacyclononane)nickel(II) perchlorate were studied regarding their suitability to act as electroactive buffer additives for IED in NACE. The performance characteristics for the respective buffer systems were evaluated. Tetraalkylammonium perchlorates served as model compounds for the optimization of the NACE-IED system. Target analytes choline and acetylcholine could easily be separated and determined by means of NACE-IED. In the case of a buffer system containing 10(-4) M tris(1,10-phenanthroline)cobalt(III) perchlorate the limits of detection were 2.5 x 10(-7) M and 4.6 x 10(-7) M for choline and acetylcholine, respectively. With the elaborated analytical procedure choline could be determined in pharmaceutical preparations.

Perchlorate

Amperometry

Perchloric acid

10.1002/1522-2683(200211)23:21<3711::aid-elps3711>3.0.co;2-z

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Citations (15)

Planare Zeolithmembran-Elektrode zur Bestimmung ionischer Tenside durch potentiometrische Titration

Silke Matysik Frank‐Michael Matysik K. Schulze W.‐D. Einicke

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Fast separations by capillary electrophoresis hyphenated to electrospray ionization time-of-flight mass spectrometry as a tool for arsenic speciation analysis

The Analyst (2012)

Claudia Niegel Simon A. Pfeiffer Marco Grundmann Uriel Arroyo‐Abad Jürgen Mattusch

Fast capillary electrophoresis (CE) hyphenated to time-of-flight mass spectrometry (TOF-MS) of four organoarsenic species (glycerol oxoarsenosugar, sulfate oxoarsenosugar, arsenobetaine, arsenocholine) are presented using short length CE capillaries under high electric field strengths of up to 1.3 kV cm−1 with small inner diameter (ID). The separation of arsenosugars by CE is demonstrated for the first time. An aqueous formic acid solution was employed as the background electrolyte (BGE) for the separation. Various acid concentrations were evaluated for their influence on migration times, separation efficiency as well as with regard to controlling the charge of the arsenic species. A 0.1 M formic acid/ammonium formate buffer (pH 2.8) proved to be suitable for the separation of the four species. A non-aqueous BGE was tested as an alternative buffer system for fast speciation analysis. Separation of arsenobetaine and arsenocholine could even be achieved within 10 s by pressure-assisted CE. Application of the optimized method for the analysis of extracts of a seagrass and a Wakame algae sample as well as the brown algae homogenate reference material IAEA-140/TM revealed a clear signal for the glycerol arsenosugar.

Genetic algorithm

Capillary electrophoresis–mass spectrometry

10.1039/c2an15944a

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Citations (25)

Corrigendum to “Effects of ambient parameters and cross-sensitivities from O2, CO2 and H2O on the photoacoustic detection of acetone in the UV region” [Sens. Actuators B: Chem. 328 (February 2021) (2020) 129001]

Sensors and Actuators B Chemical (2021)

Stefan Weigl Elisabeth Wittmann Thomas Rück Rudolf Bierl Frank‐Michael Matysik

10.1016/j.snb.2020.129392

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Elektrochemische Analytik von Nanoliterproben: Untersuchungen mittels Kapillar-Batch-Injektions-Analyse.

GIT (1998)

U. Backofen Frank‐Michael Matysik W. Hoffmann

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Chipelektrophorese: "Strategien für Injektion und Detektion"

GIT (2002)

Craig E. Lunte Ulli Backofen Frank‐Michael Matysik

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Impacts of Forced Convection Generated via High Precision Stirring on Scanning Electrochemical Microscopy Experiments in Feedback Mode

Electroanalysis (2018)

Timo Raith Christian Iffelsberger Preety Vatsyayan Frank‐Michael Matysik

Abstract In this study, the effects of forced convection on scanning electrochemical microscopy (SECM) experiments in feedback mode using ferrocenemethanol as redox mediator are presented. Forced convection, which enhances the mass transfer inside the system, was generated via an electrical high precision stirrer integrated into the SECM setup. A thin‐film interdigitated array electrode serving as model substrate was investigated with probe scan curves in z‐direction and SECM imaging in constant height mode utilizing ultramicroelectrodes (UME) with diameters ( d probe ) of 25 μm and 12.5 μm. It was found that forced convection increased the overall current during SECM imaging without distorting distinctive features of the imaged structure when working with a 25 μm UME at substrate‐to‐tip distances of 14 μm and 11 μm. Furthermore, the electrochemical contrast was improved under hydrodynamic conditions for a substrate‐to‐tip distance of 11 μm and scan rates of 5 μm s −1 , 10 μm s −1 , 20 μm s −1 and 40 μm s −1 . When further decreasing the gap between the UME and the substrate to 9 μm almost no effects of the forced convection were observed. Consequently, for a 25 μm UME, forced convection led to higher currents and improved performance during SECM experiments in feedback mode at substrate‐to‐tip distances of 14 μm and 11 μm, whereas no effects were observed for a 12.5 μm UME at a distance of 8 μm.

Scanning Electrochemical Microscopy

Forced convection

10.1002/elan.201800562

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Citations (3)

Hyphenation of Electrochemistry with Mass Spectrometry for Bioanalytical Studies

Bioanalytical reviews (2013)

Marija Cindric Frank‐Michael Matysik

Bioanalysis

Capillary electrophoresis–mass spectrometry

10.1007/11663_2013_6

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