2024
Generic conditions for electromembrane extraction of polar bases
Chen Zhou, Samira Dowlatshah, Frederik André Hansen, Stig Pedersen-Bjergaard*
Talanta 267 (2024) 125215
Optimization of generic conditions for electromembrane extraction of basic substances of moderate or low polarity
Chenchen Song, Chen Zhou, Frederik André Hansen, Anne Oldeide Hay, Stig Pedersen-Bjergaard*
Journal of Separation Science 47 (2024) 2300801
Parallel electromembrane extraction of peptides with monoterpene and medium-length fatty acid deep eutectic solvents
Samira Dowlatshah, Torstein Kige Rye, Frederik André Hansen, Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard
Analytica Chimica Acta 1297 (2024) 342360
2023
Enhancing liquid phase microextraction enrichment in microchip devices under semi-stagnant conditions
Alejandro Martín, Samira Dowlatshah, Stig Pedersen-Bjergaard, María Ramos-Payán
Microchemical Journal 195 (2023) 109383
Generic conditions for electromembrane extraction of polar bases
Chen Zhou, Samira Dowlatshah, Frederik André Hansen, Stig Pedersen Bjergaard
Talanta Volume 267, 15 January 2024, 125215
Gel electro-membrane extraction: An overview of recent strategies for extraction efficiency enhancement
Hadi Tabani, Farzaneh Dorabadizare, Stig Pedersen-Bjergaard
Trends in Analytical Chemistry 160 (2023) 116990
High-throughput quantification of emerging “nitazene” benzimidazole opioid analogs by microextraction and UHPLC-MS/MS
Maria Schüller, Ivana Lucic, Åse Marit Leere Øiestad, Stig Pedersen-Bjergaard, Elisabeth Leere Øiestad
Journal of Analytical Toxicology, 2023;, bkad071
Conductive vial electromembrane extraction –Principles and practical operation
Maria Schüller, Frederik André Hansen, Tonje Gottenberg Skaalvik, Stig Pedersen-Bjergaard
Analytical Science Advances. 2023; 4: 236–243
Electromembrane extraction of peptides based on hydrogen bond interactions
Samira Dowlatshah, Frederik André Hansen, Chen Zhou, María Ramos-Payán, Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard
Analytica Chimica Acta. 2023 Sep 22;1275:341610
Conductive vial electromembrane extraction from oral fluid
Tonje Gottenberg Skaalvik, Chen Zhou, Elisabeth Leere Øiestad, Solfrid Hegstad, Roger Trones & Stig Pedersen-Bjergaard
Analytical & Bioanalytical Chemistry 415, 5323–5335 (2023)
Generic Liquid Membranes for Electromembrane Extraction of Bases with Low or Moderate Hydrophobicity
Chen Zhou, Samira Dowlatshah, Anne Oldeide Hay, Maria Schüller, Stig Pedersen-Bjergaard, and Frederik André Hansen
Analytical Chemistry 2023 95 (23), 8982-8989
Determination of amphetamine enantiomers in urine by conductive vial electromembrane extraction and ultra-high performance supercritical fluid chromatography tandem mass spectrometry
Tonje Gottenberg Skaalvik, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard, Solfrid Hegstad
Drug Testing and Analysis 15 (2023) 909-918
Determination of tryptamine analogs in whole blood by 96-well electromembrane extraction and UHPLC-MS/MS
Maria Schüller, Tao Angell Petersen McQuade, Marianne Skov-Skov Bergh, Stig Pedersen-Bjergaard, Elisabeth Leere Øiestad*
Talanta Open 7 (2023) 100171
Gel electro-membrane extraction: An overview of recent strategies for extraction efficiency enhancement
Hadi Tabani*, Farzaneh Dorabadizare, Stig Pedersen-Bjergaard
Trends in Analytical Chemistry 160 (2023) 116990
2022
Analytical Chemistry: There is no green like more green
Elefteria Psillakis*, Sibel Ozkan, Stig Pedersen-Bjergaard
LCGC Europe 2022, 438-439
Liquid-phase microextraction in bioanalysis – How green can it be?
Anne Oldeide Hay, Frederik André Hansen, Elefteria Psillakis, Stig Pedersen-Bjergaard*
Green Analytical Chemistry 3 (2022) 100028
A rapid and versatile microfluidic method for the simultaneous extraction of polar and non-polar pharmaceuticals from human urine
Elia Santigosa, Stig Pedersen-Bjergaard, Pablo Giménez-Gómez, María Muñoz, María Ramos-Payán
Analytica Chimica Acta 1208 (2022) 339829
Electromembrane extraction – looking closer into the liquid membrane
Frederik André Hansen, Stig Pedersen-Bjergaard*
Advances in Sample Preparation 2 (2022) 100020
The ten principles of green sample preparation
Ángela I. López-Lorente, Francisco Pena-Pereira, Stig Pedersen-Bjergaard, Vânia G. Zuin, Sibel A. Ozkan, Elefteria Psillakis*
Trends in Analytical Chemistry 148 (2022) 116530
Direct electromembrane extraction-based mass spectrometry: a tool for studying drug metabolism properties of liver organoids
Frøydis Sved Skottvoll, Aleksandra Aizenshtadt, Frederik André Hansen, Mikel Amirola Martinez, Jannike Mørch Andersen, Inger Lise Bogen, Jörg P. Kutter, Stig Pedersen-Bjergaard, Elsa Lundanes, Stefan Krauss, Steven Ray Wilson
Analysis & Sensing 2 (2022) e202100051
Determination of methotrexate and its metabolites in human plasma by electromembrane extraction in conductive vials followed by LC-MS/MS
Anne Oldeide Hay, Roger Trones, Lars Herfindal, Silje Skrede, Frederik André Hansen
Advances in Sample Preparation 2 (2022) 100011
Electromembrane extraction in microfluidic formats
Frederik André Hansen, Nickolaj Jacob Petersen, Jörg Kutter, Stig Pedersen-Bjergaard*
Journal of Separation Science 45 (2022) 246-257
Membrane-based liquid-phase microextraction of basic pharmaceuticals – A study on the optimal extraction window
Maria Schüller, Kim Tu Thi Tran, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard*
Journal of Chromatography A 1664 (2022) 462769
Advanced microextraction techniques for the analysis of amphetamines in human breast milk and their comparison with conventional techniques
Hana Bavlovič Piskáčková, Alžběta Nemeškalová, Radim Kučera, Stig Pedersen-Bjergaard, Věra Najmanová, Petra Štěrbová-Kovaříková, Martin Kuchař, David Sýkora*
Journal of Pharmaceutical and Biomedical Analysis 210 (2022) 114549
Effect of sample matrices on supported liquid membrane: Efficient electromembrane extraction of cathinones from biological samples
Changbao Hong, Ying Dong, Ruiquin Zhu, Yibo Yan, Xiantao Shen, Stig Pedersen-Bjergaard, Chuixiu Huang*
Talanta 240 (2022) 123175
2021
Green and sustainable drug analysis – Combining microsampling and microextraction of drugs of abuse
Ingrid Oksavik Mestad, Astrid Gjelstad, Stig Pedersen-Bjergaard, Elisabeth Leere Øiestad*
Sustainable Chemistry and Pharmacy 24 (2021) 100517
Versatile Integration of liquid-phase microextraction and fluorescent aptamer beacons: A synergistic effect for bioanalysis
Bin Lin Huajing Liu, Chuixiu Huang, Xianjin Xiao, Stig Pedersen-Bjergaard, Xiantao Shen
Analytical Chemistry 93, 2021, 14323-14333
Electromembrane extraction of peptides using deep eutectic solvents as liquid membrane
Torstein Kige Rye, Gordana Martinovic, Linda Vårdal Eie, Frederik André Hansen, Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard*
Analytica Chimica Acta 1175 (2021) 338717
The electromembrane extraction of pharmaceutical compounds from animal tissues
Hana Bavlovič Piskáčková, Petra Kollárová-Brázdová, Radim Kučera, Miloslav Macháček, Stig Pedersen-Bjergaard, Petra Šterbová-Kovařiková
Analytica Chimica Acta 1177 (2021) 338742
Selectivity and efficiency of electromembrane extraction of polar bases with different liquid membranes – Link to analyte properties
Frederik André Hansen, Shima Tirandaz, Stig Pedersen-Bjergaard*
Journal of Separation Science 44 (2021) 2631-2641
Ultrasound-assisted electromembrane extraction with supported semi-liquid membrane
Qianqian Shang, Hang Mei, Xinrui Feng, Chuixiu Huang*, Stig Pedersen-Bjergaard, Xiantao Shen*
Analytical Chimica Acta 1184 (2021) 339038
Removal of polymerase chain reaction inhibitors by electromembrane extraction
Cong Liu, Daixin Huang, Liuqian Yang, Shifan Wu, Xiantao Shen*, Stig Pedersen-Bjergaard, Chuixiu Huang*
Analytical Chemistry 93 (2021) 11488-11496
Determination of psychoactive drugs in serum using conductive vial electromembrane extraction combined with UHPLC-MS/MS
Tonje Gottenberg Skaalvik, Elisabeth Leere Øiestad, Roger Trones, Stig Pedersen-Bjergaard, Solfrid Hegstad*
Journal of Chromatography B 1183 (2021) 122926
Microfluidic liquid-phase microextraction based on natural deep eutectic solvents immobilized in agarose membranes
Samira Dowlatshah, Mohammad Saraji, Stig Pedersen-Bjergaard, María Ramos-Payán
Journal of Chromatography A 1657 (2021) 462580
Electromembrane extraction of polar substances – Status and perspectives
Linda Vårdal Eie, Stig Pedersen-Bjergaard, Frederik André Hansen
Journal of Pharmaceutical and Biomedical Analysis 207 (2021) 114407
Green microfluidic liquid-phase microextraction of polar and non-polar acids from urine
Elia Santigosa, Stig Pedersen-Bjergaard, María Muñoz, Mariá Ramos-Paýan*
Analytical and Bioanalytical Chemistry 413 (2021) 3717-3723
Quality papers on sample preparation and extraction
Stig Pedersen-Bjergaard*
Talanta Open 3 (2021) 100043
Electromembrane extraction of peptides and amino acids – status and perspectives
Linda Vårdal Eie, Torstein Kige Rye, Frederik Hansen, Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard*
Bioanalysis 13 (2021) 277-289
Electromembrane Extraction and Mass Spectrometry for Liver Organoid Drug Metabolism Studies
Frøydis Sved Skottvoll, Frederik André Hansen, Sean Harrison, Ida Sneis Boger, Ago Mrsa, Magnus Saed Restan, Matthias Stein, Elsa Lundanes, Stig Pedersen-Bjergaard, Aleksandra Aizenshtadt, Stefan Krauss, Gareth Sullivan, Inger Lise Bogen, and Steven Ray Wilson*
Analytical Chemistry 93 (2021) 3576-3585
Organic-solvent-free electromembrane extraction based on semi-interpenetrating polymer networks
Hang Mei, Huajing Liu, Qianqian Shang, Ying Dong, Stig Pedersen-Bjergaard, Chuixiu Huang, Xiantao Shen*
Green Chemistry 23 (2021) 1782-1793
Electromembrane extraction of streptomycin from biological fluids
Frederik André Hansen and Stig Pedersen-Bjergaard
Journal of Chromatography A 1639 (2021) 461915
Electromembrane extraction of anthracyclines from plasma: Comparison with conventional extraction techniques
Hana Bavlovic Piskackova, Elisabeth Leere Øiestad, Nela Vanova, Julia Lengvarska, Petra Sterbova-Kovarikova, Stig Pedersen-Bjergaard*
Talanta 223 (2021) 121748
Electromembrane extraction using deep eutectic solvents as the liquid membrane
Frederik Andre Hansen, Elia Santigosa-Murillo, Maria Ramos-Payan, Maria Munoz, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard*
Analytica Chimica Acta 1143 (2021) 109-116
2020
Electromembrane extraction with vials of conducting polymer
Milena Drobnjak, Frederik Hansen, Elisabeth Leere Øiestad, Trond Løvli, Roger Trones, Ørjan G. Martinsen, Stig Pedersen-Bjergaard*
LCGC North America 38 (2020) 435-439
Bioanalysis of pharmaceuticals using liquid-phase microextraction and liquid chromatography-mass spectrometry
Frederik Hansen, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard*
Journal of Pharmaceutical and Biomedical Analysis 189 (2020) 113446
Electromembrane extraction of sodium dodecyl sulfate from highly concentrated solutions
Magnus Restan, Frøydis Skottvoll, Henrik Jensen, Stig Pedersen-Bjergaard*
The Analyst 145 (2020) 4957-4963
Influence of acid-base dissociation equilibria during electromembrane extraction
Magnus Restan, Sindre B. Ramsrud, Henrik Jensen, Stig Pedersen-Bjergaard*
Journal of Separation Science 43 (2020) 3120-3128
Microextraction with supported liquid membranes
Pedersen-Bjergaard, S.*
In Liquid-phase extraction, Handbooks in separation science, Elsevier (2020) 241-263
Electromembrane extraction of highly polar bases from biological samples – Deeper insight into bis(2-ethylhexyl) phosphate as ionic carrier
Hansen, F.A., Kuban, P., Øiestad, E.L., Pedersen-Bjergaard, S.*
Analytica Chimica Acta 1115 (2020) 23-32
Impact of ion balance in electromembrane extraction
Hansen, F.A., Jaghl, F., Øiestad, E.L., Jensen, H., Pedersen-Bjergaard, S.*, Huang, C.
Analytica Chimica Acta 1124 (2020) 129-136
Exploiting agarose gel modified with glucose-fructose syrup as a green sorbent in rotating-disk sorptive extraction technique for the determination of trace malondialdehyde in biological and food samples
Fashi, A.*, Cheraghi, M., Ebadipur, H., Ebadipur, H., Zamani, A., Badiee, H., Pedersen-Bjergaard, S.
Talanta 217 (2020) 121001
Electromembrane extraction using sacrificial electrodes
Hansen, F.A., Jensen, H., Pedersen-Bjergaard, S.*
Analytical Chemistry 92 (2020) 5595-5603
Unidirectional solute transfer using a Janus membrane
Dong, Y., Li, J., Pedersen-Bjergaard, S., Huang, C.
Journal of Membrane Science 596 (2020) 117723
3D cell culture models and organ-on-a-chip: Meet separation science and mass spectrometry
Lin, A., Sved Skottvoll, F., Rayner, S., (...), Ray Wilson, S., Harrison, S.
Electrophoresis 41 (2020) 56-64
Emerging Extraction Strategies in Analytical Chemistry
Hansen, F.A., Pedersen-Bjergaard, S.
Analytical Chemistry 92 (2020) 2-15
Towards exhaustive electromembrane extraction under stagnant conditions
Restan, M.S., Skjærvø, Ø., Martinsen, Ø.G., Pedersen-Bjergaard, S.
Analytica Chimica Acta 1104 (2020) 1-9
Hollow fiber-based liquid phase microextraction followed by analytical instrumental techniques for quantitative analysis of heavy metal ions and pharmaceuticals
Khan, W.A., Arain, M.B., Yamini, Y., (...), Pedersen-Bjergaard, S., Tajik, M.
Journal of Pharmaceutical Analysis 10 (2020) 109-122
Microextraction approaches for bioanalytical applications: An overview
Abdel-Rehim, M., Pedersen-Bjergaard, S., Abdel-Rehim, A., (...), Cárdenas, S., Miró, M.
Journal of Chromatography A 1616 (2020) 460-790
2019
Three-phase hollow fiber liquid-phase microextraction and parallel artificial liquid membrane extraction
Astrid Gjelstad
Trends in Analytical Chemistry 113 (2019) 25-31
Electromembrane extraction: Overview of the last decade
Nicolas Drouin, Pavel Kuban, Serge Rudaz, Stig Pedersen-Bjergaard, Julie Schappler
Trends in Analytical Chemistry 113 (2019) 357-363
Electromembrane extraction – looking into the future
Stig Pedersen-Bjergaard
Analytical and Bioanalytical Chemistry 411 (2019) 1687-1693
Electromembrane extraction of unconjugated fluorescein isothiocyanate from solutions of labelled proteins prior to flow induced dispersion analysis
Magnus Saed Restan, Morten E. Pedersen, Henrik Jensen, Stig Pedersen-Bjergaard*
Analytical Chemistry 91 (2019) 6802-6708
Electromembrane extraction with solvent modification of the acceptor solution: improved mass transfer of drugs of abuse from human plasma
Linda Vårdal, Elisabeth Leere Øiestad, Astrid Gjelstad, Henrik Jensen, Stig Pedersen-Bjergaard*
Bioanalysis 11 (2019) 755-771
Introduction to pharmaceutical analytical chemistry
Stig Pedersen-Bjergaard, Bente Gammelgaard, Trine Grønhaug Halvorsen
G.I.T. Laboratory Journal 3 (2019) 9
The modern role of smartphones in analytical chemistry
Maryam Rezazadeh, Shahram Seidi, Marthe Lid, Stig Pedersen-Bjergaard, and Yadollah Yamini
Trends in Analytical Chemistry 118 (2019) 548-555
Analytical microextraction – Present status and future directions
Stig Pedersen-Bjergaard*
Trends in Analytical Chemistry 118 (2019) 770
Liquid-phase microextraction in 96-well plates – calibration and accurate quantification of pharmaceuticals in human plasma samples
Kristine Skoglund Ask, Marthe Lid, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard, Astrid Gjelstad*
Journal of Chromatography A 1602 (2019) 117-123
On-chip electromembrane extraction of acidic drugs
Cristina Roman-Hidalgo, Elia Santigosa-Murillo, María Ramos-Payán*, Nickolaj Jacob Petersen, Jörg P. Kutter, Stig Pedersen-Bjergaard
Electrophoresis 40 (2019) 2514-2521
Liquid-phase microextraction or electromembrane extraction?
Libin Wan, Bin Lin, Ruiqin Zhu, Chuixiu Huang*, Stig Pedersen-Bjergaard, Xiantao Shen*
Analytical Chemistry 91 (2019) 8267-8273
2018
Electromembrane extraction of substances with weakly basic properties: a fundamental study with benzodiazepines
Linda Vårdal, Elisabeth Leere Øiestad, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Bioanalysis 10 (2018) 769-781
Rapid determination of designer benzodiazepines, benzodiazepines, and Z-hypnotics in whole blood using parallel artificial liquid membrane extraction and UHPLC-MS/MS
Linda Vårdal, Gladys Wong, Åse Marit Leere Øiestad, Stig Pedersen-Bjergaard, Astrid Gjelstad, Elisabeth Leere Øiestad*
Analytical and Bioanalytical Chemistry 410 (2018) 4967–4978
Continuous electromembrane extraction coupled with mass spectrometry – Perspectives and challenges
David Fuchs, Cristina Roman Hidalgo, Maria Ramos Payan, Nickolaj Jacob Petersen, Henrik Jensen, Jörg P. Kutter, Stig Pedersen-Bjergaard*
Analytica Chimica Acta 999 (2018) 27-36
Investigation of alternative supported liquid membranes in electromembrane extraction of basic drugs from human plasma
Chuixiu Huang, Xiantao Shen, Astrid Gjelstad, Stig Pedersen-Bjergaard
Journal of Membrane Science 548 (2018) 176-183
Semi-automated set-up for exhaustive micro-electromembrane extractions of basic drugs from biological fluids
Milos Dvorak, Knut Fredrik Seip, Stig Pedersen-Bjergaard, Pavel Kuban
Analytica Chimica Acta 1005 (2018) 34-42
Parallel artificial liquid membrane extraction of psychoactive analytes: a novel approach in therapeutic drug monitoring
Katharina Norgren Olsen, Kristine Skoglund Ask, Stig Pedersen-Bjergaard, and Astrid Gjelstad*
Bioanalysis 10 (2018) 385-395.
Dried blood spots and parallel artificial liquid membrane extraction – A simple combination of microsampling and microextraction
Kristine Skoglund Ask, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard, and Astrid Gjelstad*
Analytica Chimica Acta 1009 (2018) 56-64
Nanoliter-scale electromembrane extraction and enrichment in a microfluidic chip
Frederik A. Hansen, Drago Sticker, Jörg P. Kutter, Nickolaj J. Petersen, Stig Pedersen-Bjergaard*
Analytical Chemistry 90 (2018) 9322-9329
Electromembrane extraction of high level substances: A novel approach for selective recovery of templates in molecular imprinting
Bin Lin, Libin Wan, Xiaojie Sun, Chuixiu Huang, Stig Pedersen-Bjergaard, Xiantao Shen
Journal of Membrane Science 568, 2018, 30-39
Those Who Can, Teach: Pharma Stars
Øystein Skjærvø, Veronika Pilarova, Maria Khalikova, Leon Reubsaet, Trine Grønhaug Halvorsen, Astrid Gjelstad, Elisabeth Leere Øiestad, Elsa Lundanes, Steven Wilson, Stig Pedersen-Bjergaard
The Analytical Scientist 1118 (2018) 40-45
2017
Electromembrane extraction with alkylated phosphites and phosphates as supported liquid membranes
Chuixiu Huang*, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Journal of Membrane Science 526 (2017) 18-24.
High-throughput liquid-liquid extraction in 96-well format: Parallel artificial liquid membrane extraction
Astrid Gjelstad, Alf Terje Andresen, Anders Dahlgren, Thomas E. Gundersen, Stig Pedersen-Bjergaard
LC●GC Europe 30 (2017) 10-17
LC●GC North America 35 (2017) 192-196
One-step extraction of polar drugs from plasma by parallel artificial liquid membrane extraction
Veronika Pilarova, Mumtaz Sultani, Kristine Skoglund Ask, Lucie Novakova, Stig Pedersen-Bjergaard, and Astrid Gjelstad
Journal of Chromatography B 1043 (2017) 25-32
Parallel artificial liquid membrane extraction of new psychoactive substances in plasma and whole blood
Linda Vårdal, Hilde-Merete Askildsen, Astrid Gjelstad, Elisabeth Leere Øiestad, Hilde Marie Erøy Edvardsen, Stig Pedersen-Bjergaard*
Journal of Chromatography B 1048 (2017) 77-84
Arrested development – Given ongoing challenges in sample preparation and lack of novel alternatives, is it time to give liquid-phase microextraction (LPME) a second chance?
Stig Pedersen-Bjergaard*, Astrid Gjelstad, Knut Einar Rasmussen
The Analytical Scientist, Issue 49, February 2017, 46-49
Maghemite nanoparticle-decorated hollow fiber electromembrane extraction combined with dispersive liquid-liquid microextraction for the determination of thymol from Carum copticum
Mostafa Khajeh*, Stig Pedersen-Bjergaard, Mousa Bohlooli, Afsaneh Barkhordar, and Mansour Ghaffari-Moghaddam
Journal of the Science of Food and Agriculture 97 (2017) 1517-1523
Efficient discrimination and removal of phospholipids during electromembrane extraction from human plasma samples
Linda Vårdal, Astrid Gjelstad, Chuixiu Huang, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard*
Bioanalysis 9 (2017) 631-641
Electromembrane extraction – Recent trends and where to go
Stig Pedersen-Bjergaard*, Chuixiu Huang, Astrid Gjelstad
Journal of Pharmaceutical Analysis 7 (2017) 141-147
Complexation-mediated electromembrane extraction of highly polar basic drugs – a fundamental study with catecholamines in urine as model system
Elena Fernández, Linda Vårdal, Lorena Vidal, Antonio Canals, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Analytical and Bioanalytical Chemistry 409 (2017) 4215-4223
Direct coupling of electromembrane extraction to mass spectrometry – Advancing the probe functionality toward measurements of zwitterionic drug metabolites
Torstein Kige Rye, David Fuchs, Stig Pedersen-Bjergaard, Nickolaj Jacob Petersen
Analytica Chimica Acta 983 (2017) 121-129
Electromembrane extraction
Chuixiu Huang*, Zhiliang Chen, Astrid Gjelstad, Stig Pedersen-Bjergaard, Xiantao Shen**
Trends in Analytical Chemistry 95 (2017) 47-56
Comprehensive study of buffer systems and local pH effects in electromembrane extraction
Magnus Saed Restan, Henrik Jensen, Xiantao Shen, Chuixiu Huang, Ørjan Grøttem Martinsen, Pavel Kuban, Astrid Gjelstad, Stig Pedersen-Bjergaard
Analytica Chimica Acta 984 (2017) 116-123
2016
Mass transfer in electromembrane extraction – The link between theory and experiments
Chuixiu Huang, Henrik Jensen, Knut Fredrik Seip, Astrid Gjelstad, and Stig Pedersen-Bjergaard*
Journal of Separation Science 39 (2016) 188-197.
Direct coupling of a flow-flow electromembrane extraction probe to LC-MS
David Fuchs, Charlotte Gabel-Jensen, Henrik Jensen, Kasper D. Rand, Stig Pedersen-Bjergaard, Steen Honoré Hansen, Nickolaj Jacob Petersen
Analytica Chimica Acta 905 (2016) 93-99.
Dried blood spots on carboxymethyl cellulose sheets: rapid sample preparation based on dissolution and precipitation
Kristine Skoglund Ask, Stig Pedersen-Bjergaard, Astrid Gjelstad*
Chromatographia 79 (2016) 509-514.
Fully automated electro membrane extraction autosampler for LC-MS systems allowing soft extractions for high-throughput applications
David Fuchs, Stig Pedersen-Bjergaard, Henrik Jensen, Kasper D. Rand, Steen Honoré Hansen, and Nickolaj Jacob Petersen
Analytical Chemistry 88 (2016) 6797-6804.
Parallel artificial liquid membrane extraction as an efficient tool for removal of phospholipids from human plasma
Kristine Skoglund Ask, Turgay Bardakci, Marthe Petrine Parmer, Trine Grønhaug Halvorsen, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard, and Astrid Gjelstad
Journal of Pharmaceutical and Biomedical Analysis 129 (2016) 229-236.
Electromembrane extraction of polar basic drugs from plasma with pure bis(2-ethylhexyl) phosphite as supported liquid membrane
Chuixiu Huang, Knut Fredrik Seip, Astrid Gjelstad, and Stig Pedersen-Bjergaard
Analytica Chimica Acta 934 (2016) 80-87.
2015
Application of hollow cylindrical wheat stem for electromembrane extraction of thorium in water samples
Mostafa Khajeh*, Stig Pedersen-Bjergaard, Afsaneh Barkhordar, Mousa Bohlooli
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy137 (2015) 328-332.
Exhaustive extraction of peptides by electromembrane extraction
Chuixiu Huang, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Analytica Chimica Acta 853 (2015) 328-334.
The potential of electromembrane extraction for bioanalytical applications
Knut Fredrik Seip*, Astrid Gjelstad, Stig Pedersen-Bjergaard
Bioanalysis 7 (2015) 463-480.
Selective electromembrane extraction based on isoelectric point: Fundamental studies with angiotensin II antipeptide as model analyte
Chuixiu Huang, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Journal of Membrane Science 481 (2015) 115-123.
On-chip electromembrane extraction for monitoring drug metabolism in real time by electrospray ionization mass spectrometry
Nickolaj Jacob Petersen, Henrik Jensen, Stig Pedersen-Bjergaard
Microchip Capillary Electrophoresis Protocols, Methods in Molecular Biology 1274 (2015) 171-182.
Parallel artificial liquid membrane extraction of acidic drugs from human plasma
Mercedes Roldán-Pijuán, Stig Pedersen-Bjergaard, Astrid Gjelstad
Analytical and Bioanalytical Chemistry 407 (2015) 2811-2819.
Real time extraction kinetics of electro membrane extraction verified by comparing drug metabolism profiles obtained from a flow-flow electro membrane extraction-mass spectrometry system with LC-MS
David Fuchs, Henrik Jensen, Stig Pedersen-Bjergaard, Charlotte Gabel-Jensen, Steen Honoré Hansen, Nickolaj Jacob Petersen*
Analytical Chemistry 87 (2015) 5775-5781.
Combination of electromembrane extraction and liquid-phase microextraction in a single step: Simultaneous group separation of acidic and basic drugs
Chuixiu Huang, Knut Fredrik Seip, Astrid Gjelstad, Xiantao Shen*, and Stig Pedersen-Bjergaard*
Analytical Chemistry 87 (2015) 6951-6957.
Electromembrane extraction for pharmaceutical and biomedical analysis – Quo vadis
Chuixiu Huang, Knut Fredrik Seip, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Journal of Pharmaceutical and Biomedical Analysis 113 (2015) 97-107.
Electromembrane extraction as a rapid and selective miniaturized sample preparation technique for biological fluids
Astrid Gjelstad, Stig Pedersen-Bjergaard, Knut Fredrik Seip*
Bioanalysis 7 (2015) 2203-2209.
Exhaustive and stable electromembrane extraction of acidic drugs from human plasma
Chuixiu Huang, Astrid Gjelstad, Knut Fredrik Seip, Henrik Jensen, Stig Pedersen-Bjergaard*
Journal of Chromatography A 1425 (2015) 81-87.
2014
Challenges and new directions in analytical sample preparation
Astrid Gjelstad and Stig Pedersen-Bjergaard
Analytical and Bioanalytical Chemistry 406 (2014) 375-376.
Development and characterization of a small electromembrane extraction probe coupled with mass spectrometry for real-time and online monitoring of in vitro drug metabolism
Helene Bonkerud Dugstad, Nickolaj Jacob Petersen*, Henrik Jensen, Charlotte Gabel-Jensen, Steen Honoré Hansen, and Stig Pedersen-Bjergaard
Analytical and Bioanalytical Chemistry 406 (2014) 421-429.
Parallel electromembrane extraction in a multiwall plate
Lars Erik Eng Eibak, Marthe Petrine Parmer, Knut Einar Rasmussen, Stig Pedersen-Bjergaard, Astrid Gjelstad*
Analytical and Bioanalytical Chemistry 406 (2014) 431-440.
Design and implementation of an automated liquid-phase microextraction-chip system coupled on-line with high performance liquid chromatography
Bin Li, Nickolaj Jacob Petersen*, María D. Ramos Payán, Stehen Honoré Hansen, and Stig Pedersen-Bjergaard
Talanta 120 (2014) 224-229.
Development of a flat membrane based device for electromembrane extraction: A new approach for exhaustive extraction of basic drugs from human plasma
Chuixiu Huang, Lars Erik Eng Eibak, Astrid Gjelstad, Xiantao Shen, Roger Trones, Henrik Jensen, Stig Pedersen-Bjergaard*
Journal of Chromatography A 1326 (2014) 7-12.
Stability and efficiency of supported liquid membranes in electromembrane extraction – A link to solvent properties
Knut Fredrik Seip, Moheba Faizi, Cristina Vergel, Astrid Gjelstad, and Stig Pedersen-Bjergaard*
Analytical and Bioanalytical Chemistry 406 (2014) 2151-2161.
Parallel electromembrane extraction in the 96-well format
Lars Erik Eng Eibak, Knut Einar Rasmussen, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard, Astrid Gjelstad*
Analytica Chimica Acta 828 (2014) 46-52.
Salt effects in electromembrane extraction
Knut Fredrik Seip, Henrik Jensen, Thanh Elisabeth Kieu, Strid Gjelstad, Stig Pedersen-Bjergaard*
Journal of Chromatography A 1347 (2014) 1-7.
Electromembrane extraction – Three phase electrophoresis for future preparative applications
Astrid Gjelstad, Stig Pedersen-Bjergaard*
Electrophoresis 35 (2014) 2421-2428.
A new tool for sample preparation
Marthe Parmer, Astrid Gjelstad*, Stig Pedersen-Bjergaard
GIT Laboratory Journal Europe 18/11-12 (2014) 18-19
2013
Storage of oral fluid as dried spots on alginate and chitosan foam – A new concept for oral fluid collection
Christine Pernille Lødøen, Lars Erik Eng Eibak, Knut Einar Rasmussen, Stig Pedersen-Bjergaard, Therese Andersen, Astrid Gjelstad*
Bioanalysis 3 (2013) 317-325.
Electromembrane extraction: Distribution or electrophoresis?
Knut Fredrik Seip, Henrik Jensen, Marit Hovde Sønsteby, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Electrophoresis 34 (2013) 792-799.
Parallel artificial liquid membrane extraction: micro-scale liquid-liquid-liquid extraction in the 96-well format
Astrid Gjelstad*, Knut Einar Rasmussen, Marthe Petrine Parmer, Stig Pedersen-Bjergaard
Bioanalysis 5 (2013) 1377-1385.
Nano-electromembrane extraction
María D. Ramos Payán, Bin Li, Nickolaj Jacob Petersen*, Henrik Jensen, Steen Honoré Hansen, Stig Pedersen-Bjergaard
Analytica Chimica Acta 785 (2013) 60-66.
Electromembrane extraction from aqueous samples containing polar organic solvents
Knut Fredrik Seip, Astrid Gjelstad, Stig Pedersen-Bjergaard*
Journal of Chromatography A 1308 (2013) 37-44.
Recent developments in electromembrane extraction
Astrid Gjelstad* and Stig Pedersen-Bjergaard
Analytical Methods 5 (2013) 4549-4557.
High-throughput analysis of drugs in biological fluids by desorption electrospray ionization mass spectrometry coupled with thin liquid membrane extraction
Cecilie Rosting, Stig Pedersen-Bjergaard, Steen Honoré Hansen, Christian Janfelt*
Analyst 138 (2013) 5965-5972.
Perspective: Hollow fibre liquid-phase microextraction – principles, performance, applicability, and future directions
Astrid Gjelstad and Stig Pedersen-Bjergaard
Scientia Chromatographica 5 (2013) 1-10.
2012
Liquid-phase microextraction and desorption electrospray ionization mass spectrometry for identification and quantification of basic drugs in human urine
Janina Thunig, Linda Flø, Stig Pedersen-Bjergaard, Steen Honoré Hansen, and Christian Janfelt*
Rapid Communications in Mass Spectrometry 26 (2012) 133-140.
Exhaustive electromembrane extraction of some basic drugs from human plasma followed by liquid chromatography-mass spectrometry
Lars Erik Eng Eibak, Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Pharmaceutical and Biomedical Analysis 57 (2012) 33-38.
Fast, selective, and sensitive analysis of low-abundance peptides in human plasma by electromembrane extraction
Marte Balchen, Hanne Lund, Leon Reubsaet, and Stig Pedersen-Bjergaard
Analytica Chimica Acta 716 (2012) 16-23.
Electromembrane extraction of stimulating drugs from undiluted whole blood
Ragnhild Elén Gjulem Jamt, Astrid Gjelstad*, Lars Erik Eng Eibak, Elisabeth Leere Øiestad, Asbjørg Solberg Christophersen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard
Journal of Chromatography A 1232 (2012) 27-36.
Liquid-phase microextraction in a microfluidic-chip – High enrichment and sample clean-up from small sample volumes based on three-phase extraction
María D. Ramos Payán, Henrik Jensen, Nickolaj Jacob Petersen, Steen Honoré Hansen, and Stig Pedersen-Bjergaard*
Analytica Chimica Acta 735 (2012) 46-53.
Hollow fiber liquid-phase microextraction
Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard
In Comprehensive Sampling and Sample Preparation, Volume 2; Pawliszyn, J.; Lord, H.L.; Eds; Elsevier, Academic Press: Oxford, UK, pp 475-496, 2012
Selective electromembrane extraction at low voltages based on analyte polarity and charge
Noelia Cabaleiro Domínguez, Astrid Gjelstad*, Andrea Molina Nadal, Henrik Jensen, Nickolaj Jacob Petersen, Steen Honoré Hansen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard
Journal of Chromatography A 1248 (2012) 48-54.
On-chip electromembrane extraction for monitoring drug metabolism in real time by electrospray ionization mass spectrometry
Nickolaj Jacob Petersen, Jacob Sønderby Pedersen, Nicklas Nørgård Poulsen, Henrik Jensen, Christian Skonberg, Steen Honoré Hansen, and Stig Pedersen-Bjergaard
Analyst 137 (2012) 3321-3327.
Kinetic aspects of hollow fiber liquid-phase microextraction and electromembrane extraction
Astrid Gjelstad*, Henrik Jensen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard
Analytica Chimica Acta 742 (2012) 10-16.
The potential application of electromembrane extraction for the analysis of peptides in biological fluids
Knut Fredrik Seip, Astrid Gjelstad, and Stig Pedersen-Bjergaard
Bioanalysis 4 (2012) 1971-1973.
Alginate and chitosan foam combined with electromembrane extraction for dried blood spot analysis
Lars Erik Eng Eibak, Anne Bee Hegge, Knut Einar Rasmussen, Stig Pedersen-Bjergaard, and Astrid Gjelstad*
Analytical Chemistry 84 (2012) 8783-8789.
2011
On-chip electro membrane extraction with on-line ultraviolet and mass spectrometric detection
Nickolaj Jacob Petersen*, Sunniva Taule Foss, Henrik Jensen, Steen Honoré Hansen, Christian Skonberg, Detlef Snakenborg, Jörg P. Kutter, and Stig Pedersen-Bjergaard
Analytical Chemistry 83 (2011) 44-51
Electromembrane extraction: a new technique for accelerating bioanalytical sample preparation
Astrid Gjelstad* and Stig Pedersen-Bjergaard
Bioanalysis 3 (2011) 787-797
Fundamental studies on the electrokinetic transfer of net cationic peptides across supported liquid membranes
Marte Balchen*, Anne Guro Hatterud, Léon Reubsaet, and Stig Pedersen-Bjergaard
Journal of Separation Science 34 (2011) 186-195.
Electromembrane extraction from biological fluids
Nickolaj Jacob Petersen*, Knut Einar Rasmussen, Stig Pedersen-Bjergaard, and Astrid Gjelstad
Analytical Sciences 27 (2011) 965-972.
Electromembrane extraction and HPLC analysis of haloacetic acids and aromatic acetic acids in waste water
Khalid Alhooshani, Chanbasha Basheer, Jagit Kaur, Astrid Gjelstad, Knut E. Rasmussen, Stig Pedersen-Bjergaard, and Hian Kee Lee*
Talanta 86 (2011) 109-113.
Hollow-fibre liquid-phase microextraction in the three-phase mode – Practical considerations
Astrid Gjelstad, Hamidreza Taherkhani, Knut Einar Rasmussen, Stig Pedersen-Bjergaard, and Ronald E. Majors
LC-GC Europe 29 (2011) 633-641.
Electromembrane extraction of peptides - Fundamental studies on the supported liquid membrane
Knut Fredrik Seip, Jeanette Stigsson, Astrid Gjelstad, Marte Balchen, and Stig Pedersen-Bjergaard*
Journal of Separation Science 34 (2011) 3410-3417.
2010
Implementation of droplet-membrane-droplet liquid-phase microextraction under stagnant conditions for lab-on-a-chip applications
Tiina Sikanen, Stig Pedersen-Bjergaard, Henrik Jensen, Risto Kostiainen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard
Analytica Chimica Acta 658 (2010) 133-140.
Hollow fiber-liquid-phase microextraction of fungicides from orange juices
Francisco Barahona*, Astrid Gjelstad, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Journal of Chromatography A 1217 (2010) 1989-1994.
Potential-driven peptide extractions across supported liquid membranes: Investigation of principal operational parameters
Marte Balchen, Henrik Jensen, Leon Reubsaet, and Stig Pedersen-Bjergaard
Journal of Separation Science 33 (2010) 1665-1672.
Kinetic electro membrane extraction under stagnant conditions - Fast isolation of drugs from untreated human plasma
Lars Erik Eng Eibak, Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1217 (2010) 5050-5056.
On-chip electro membrane extraction
Nickolaj Jacob Petersen, Henrik Jensen, Steen Honoré Hansen, Sunniva Taule Foss, Detlef Snakenborg, Stig Pedersen-Bjergaard
Microfluidics and Nanofluidics 9 (2010) 881-888.
Simultaneous extraction of acidic and basic drugs at neutral sample pH: A novel electro-mediated microextraction approach
Chanbasha Basheer, Jingyi Lee, Stig Pedersen-Bjergaard, Knut Einar Rasmussen, Hian Kee Lee
Journal of Chromatography A 1217 (2010) 6661-6667.
Liquid-phase microextraction (LPME) utilizing porous hollow fibers
Stig Pedersen-Bjergaard, Knut Einar Rasmussen, and Jan Åke Jönsson
In “Handbook of Sample Preparation”, Editors Janusz Pawliszyn and Heather Lord, Wiley , 2010, 125-148
2009
Electromembrane extraction of basic drugs from untreated human plasma and whole blood under physiological pH conditions
Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Analytical and Bioanalytical Chemistry 393 (2009) 921-928.
Drop-to-drop microextraction across a supported liquid membrane by an electrical field under stagnant conditions
Nickolaj Jacob Petersen, Henrik Jensen, Steen Honoré Hansen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1216 (2009) 1496-1502.
Rapid isolation of Angiotensin peptides from plasma by electromembrane extraction
Marte Balchen, Trine Grønhaug Halvorsen, Leon Reubsaet, and Stig Pedersen-Bjergaard*
Journal of Chromatography A, 1216 (2009) 6900-6905.
2008
Low-voltage electromembrane extraction of basic drugs from biological samples
Inger Johanne Østegaard Kjelsen, Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1180 (2008) 1-9.
Hollow-fiber supported liquid-phase microextraction – enrichment and sample clean-up for drug analysis with micro liter volumes of organic solvent
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Asian Chemistry Letters 12 (2008) 1-8.
Liquid-phase microextraction with porous hollow fibers, a miniaturized and highly flexible format for liquid-liquid extraction
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Journal of Chromatography A 1184 (2008) 132-142.
Parameters affecting electro membrane extraction of basic drugs
Torunn M. Middelthon-Bruer, Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Separation Science 31 (2008) 753-759.
Electromembrane extraction of peptides
Marte Balchen, Leon Reubsaet, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1194 (2008) 143-149.
Selective three-phase liquid phase microextraction of acidic compounds from foodstuff simulants
Angel Rodriguez, Stig Pedersen-Bjergaard, Knut Einar Rasmussen, Cristina Nerin
Journal of Chromatography A 1198 (2008) 38-44.
Environmental and bioanalytical applications of hollow fiber membrane liquid-phase microextraction: A review
Jingyi Lee, Hian Kee Lee, Knut Einar Rasmussen, Stig Pedersen-Bjergaard
Analytica Chimica Acta 624 (2008) 253-268.
LPME
Stig Pedersen-Bjergaard, Knut Einar Rasmussen, Hian Kee Lee
www.chromedia.org (2008)
Electrical potential can drive liquid-liquid extraction for sample preparation in chromatography
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Trends in Analytical Chemistry 27 (2008) 934-941.
2007
Electrokinetic Migration of Acidic Drugs across a Supported Liquid Membrane
Marte Balchen, Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1152 (2007) 220-225.
25,000-Fold Pre-concentration in a single step with Liquid-phase Microextraction
Tung Si Ho, Terje Vasskog, Trude Anderssen, Einar Jensen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Analytica Chimica Acta 592 (2007) 1-8.
Supported liquid membranes in hollow fiber liquid-phase microextraction (LPME) – Practical considerations in the three-phase mode
Kari Folde Bårdstu, Tung Si Ho, Knut Einar Rasmussen, Stig Pedersen-Bjergaard*, and Jan Åke Jönsson
Journal of Separation Science 30 (2007) 1364-1370.
Extraction across supported liquid membranes by use of electrical fields
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Analytical and Bioanalytical Chemistry 388 (2007) 521-523.
Microextraction across supported liquid membranes forced by pH gradients and electrical fields
Astrid Gjelstad, Torill Marita Andersen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1157 (2007) 38-45.
Simulation of flux during electro membrane extraction based on the Nernst-Planck Equation
Astrid Gjelstad, Knut Einar Rasmussen, Stig Pedersen-Bjergaard*
Journal of Chromatography A 1174 (2007) 104-111.
2006
Electrokinetic Migration across Artificial Liquid Membranes – New concept for Rapid Sample Preparation of Biological Fluids
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Journal of Chromatography A 1109 (2006) 183-190.
Analytical Microextraction – Current Status and Future Trends
Janusz Pawliszyn and Stig Pedersen-Bjergaard
Journal of Chromatographic Science 44 (2006) 291-307.
Experiences with Carrier-Mediated Transport in Liquid Phase Micro Extraction
Tung Si Ho, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Journal of Chromatographic Science 44 (2006) 308-316
Electrokinetic Migration across Artificial Liquid Membranes – Tuning the Membrane Chemistry to Different Types of Drug Substances
Astrid Gjelstad, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Journal of Chromatography A 1124 (2006) 29-34.
2005
Bioanalysis of Drugs by Liquid-Phase Microextraction Coupled to Separation Techniques
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Journal of Chromatography B 817 (2005) 3-12.
Liquid-phase microextraction based on carrier mediated transport combined with liquid chromatography – mass spectrometry – A new concept for the determination of polar drugs in a single drop of human plasma
Tung Si Ho*, Jan Leon Egge Reubsaet, Hanne Sofie Anthonsen, Stig Pedersen-Bjergaard, Knut Einar Rasmussen
Journal of Chromatography A 1072 (2005) 29-36.
Liquid-Phase Microextraction of Basic Drugs – Selection of Extraction Mode based on Computer Calculated Solubility Data
Stig Pedersen-Bjergaard*, Knut Einar Rasmussen, Anders Brekke, Tung Si Ho, and Trine Grønhaug Halvorsen
Journal of Separation Science 28 (2005) 1195-1203.
2004
Liquid-phase Microextraction utilizing Plant Oils as Intermediate Extraction Medium – Towards Elimination of Hazardous Organic Solvents in Sample Preparation
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Journal of Separation Science 27 (2004) 1511-1516.
Developments in Hollow Fibre Based Liquid-phase Microextraction
Knut Einar Rasmussen and Stig Pedersen-Bjergaard*
Trends in Analytical Chemistry 23 (2004) 1-10.
2003
Liquid-Phase Microextraction and Liquid Chromatographic-Tandem Mass Spectrometric Analysis of Anabolic Steroid Glucoronides in Urine
Tiia Kuuranne, Antti Leinonen, Steven Westwood, Tapio Kotiaho, Stig Pedersen-Bjergaard, Knut Einar Rasmussen, and Risto Kostiainen
Journal of Mass Spectrometry 38 (2003) 16-26.
Liquid-phase Microextraction of Hydrophillic Drugs by Carrier-mediated Transport
Tung Si Ho*, Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Journal of Chromatography A 998 (2003) 61-72.
Liquid-Phase Microextraction of Drugs from Human Breast Milk
Anett Bjørhovde, Trine Grønhaug Halvorsen, Knut Einar Rasmussen, and Stig Pedersen-Bjergaard*
Analytica Chimica Acta 491 (2003) 155-161.
Stereospecific Determination of Citalopram and Desmethylcitalopram by Capillary Electrophoresis and Liquid-Phase Microextraction
Solveig Andersen*, Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard, Knut Einar Rasmussen, Lars Tanum, and Helge Refsum
Journal of Pharmaceutical and Biomedical Analysis 33 (2003) 263-273.
Liquid-Phase Microextraction Combined with Liquid Chromatography-Mass Spectrometry. Extraction from Small Volumes of Biological Samples
Trine Grønhaug Halvorsen, Stig Pedersen-Bjergaard*, Jan Leon Egge Reubsaet, and Knut Einar Rasmussen
Journal of Separation Science 26 (2003) 1520-1526.
2002
Fundamental Studies on Selectivity in 3-Phase Liquid-Phase Microextraction (LPME)
Stig Pedersen-Bjergaard*, Tung Si Ho, and Knut Einar Rasmussen
Journal of Separation Science 25 (2002) 141-146.
Recovery, Enrichment and Selectivity in Liquid-Phase Microextraction (LPME) – Comparison With Traditional Liquid-Liquid Extraction techniques
Tung Si Ho, Stig Pedersen-Bjergaard*, and Knut Einar Rasmussen
Journal of Chromatography A 963 (2002) 3-17
Liquid-Phase Microextraction Combined with Capillary Electrophoresis – A Promising Tool for Determination of Chiral Drugs in Biological Matrices
Solveig Andersen, Trine Grønhaug Halvorsen*, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Journal of Chromatography A 963 (2002) 303-312.
Liquid-Phase Microextraction (LPME) of Protein-Bound Drugs under Non-Equilibrium Conditions
Tung Si Ho*, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Analyst 127 (2002) 608-613.
2001
Liquid-Phase Microextraction and Capillary Electrophoresis of Citalopram, an Antidepressant Drug
Trine Grønhaug*, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Journal of Chromatography A 909 (2001) 87-93.
Reduction of Extraction Times in Liquid-Phase Microextraction -
Trine Grønhaug Halvorsen*, Stig Pedersen-Bjergaard, and Knut Einar Rasmussen
Journal of Chromatography B 760 (2001) 219-226.
Liquid-Phase Microextraction Combined with Flow-Injection Tandem Mass Spectrometry – Rapid Screening of Amphetamines from Biological Matrices
Trine GrønhaugHalvorsen*, Stig Pedersen-Bjergaard, Leon Reubsaet, and Knut Einar Rasmussen
Journal of Separation Science 24 (2001) 615-622.
2000
Liquid-Phase Microextraction (LPME) and Capillary Electrophoresis of Acidic Drugs
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Electrophoresis 21 (2000) 579-585.
Development of a Simple In-Vial Liquid-Phase Microextraction Device (LPME) for Drug Analysis Compatible with both Capillary Gas Chromatography, Capillary Electrophoresis, and High-Performance Liquid Chromatography
Knut Einar Rasmussen, Stig Pedersen-Bjergaard*, Mette Krogh, Hege Grefslie, and Trine Grønhaug,
Journal of Chromatography A 873 (2000) 3-11.
Liquid-Liquid Extraction Procedures for Sample Enrichment in CZE (Invited)
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Journal of Chromatography A 902 (2000) 91-105.
1999
Liquid-Liquid-Liquid Microextraction (LLLME) for Sample Preparation of Biological Fluids prior to Capillary Electrophoresis
Stig Pedersen-Bjergaard* and Knut Einar Rasmussen
Analytical Chemistry 71 (1999) 2650-2656.
