Publications 2024

Fabris AL, Hansen FA, Yonamine M, Pedersen-Bjergaard S, Øiestad EL (2024)
An efficient and green method for the analysis of synthetic cathinones in whole blood using 96-well electromembrane extraction and LC-MS/MS
Sustainable Chemistry and Pharmacy, 38, 101494
DOI 10.1016/j.scp.2024.101494, PublikaID 508

Noreng L, Wilson SR, Øiestad EL, Øiestad ML (2024)
On the Surprising Retention Order of Ketamine Analogs Using a Biphenyl Stationary Phase
LCGC Supplements Recent Developments in HPLC, 1, 26–29
DOI 10.56530/lcgc.int.yk4168j2, PublikaID 509

Publications 2021

Hansen FA, Santigosa-Murillo E, Ramos-Payan M, Munoz M, Oiestad EL, Pedersen-Bjergaard S (2021)
Electromembrane extraction using deep eutectic solvents as the liquid membrane
Anal. Chim. Acta, 1143, 109-116
DOI 10.1016/j.aca.2020.11.044

Mestad IO, Gjelstad A, Pedersen-Bjergaard S, Oiestad EL (2021)
Green and sustainable drug analysis-Combining microsampling and microextraction of drugs of abuse
SUSTAIN. CHEM. PHARM., 24, 100517
DOI 10.1016/j.scp.2021.100517

Oiestad EL, Bojko B, Boyaci E (2021)
Novel approaches and green sample preparation in bioanalytical protocols
SUSTAIN. CHEM. PHARM., 24, 100559
DOI 10.1016/j.scp.2021.100559

Pettersen S, Oiestad AML, Rogde S, Brochmann GW, Oiestad EL, Vindenes V (2021)
Distribution of tetrahydrocannabinol and cannabidiol in several different postmortem matrices
Forensic Sci.Int., 329, 111082
DOI 10.1016/j.forsciint.2021.111082

Piskackova HB, Oiestad EL, Vanova N, Lengvarska J, Sterbova-Kovarikova P, Pedersen-Bjergaard S (2021)
Electromembrane extraction of anthracyclines from plasma: Comparison with conventional extraction techniques
Talanta, 223, 121748
DOI 10.1016/j.talanta.2020.121748

Skaalvik TG, Oiestad EL, Trones R, Pedersen-Bjergaard S, Hegstad S (2021)
Determination of psychoactive drugs in serum using conductive vial electromembrane extraction combined with UHPLC-MS/MS
J. Chromatogr. B, 1183, 122926
DOI 10.1016/j.jchromb.2021.122926

Publications 2020

Drobnjak M, Hansen F, Øiestad EL, Løvli T, Trones R, Martinsen G, Pedersen-Bjertgaard S (2020)
Electromembrane Extraction with Vitals of Counducting Polymer
LCGCN North America, 38 (8), 435-439
PublikaID 355

Hansen F, Jaghl F, Oiestad EL, Jensen H, Pedersen-Bjergaard S, Huang CX (2020)
Impact of ion balance in electromembrane extraction
Anal. Chim. Acta, 1124, 129-136
DOI 10.1016/j.aca.2020.05.039

Hansen F, Oiestad EL, Pedersen-Bjergaard S (2020)
Bioanalysis of pharmaceuticals using liquid-phase microextraction combined with liquid chromatography-mass spectrometry
J. Pharm. Biomed. Anal., 189, 113446
DOI 10.1016/j.jpba.2020.113446

Hansen FA, Kuban P, Oiestad EL, Pedersen-Bjergaard S (2020)
Electromembrane extraction of highly polar bases from biological samples - Deeper insight into bis(2-ethylhexyl) phosphate as ionic carrier
Anal. Chim. Acta, 1115, 23-32
DOI 10.1016/j.aca.2020.04.027

Seljetun KO, Sandvik M, Vindenes V, Eliassen E, Oiestad EL, Madslien K, Moe L (2020)
Comparison of anticoagulant rodenticide concentrations in liver and feces from apparently healthy red foxes
J. Vet. Diagn. Invest., 32 (4), 1040638720927365-564
DOI 10.1177/1040638720927365

Seljetun KO, Vindenes V, Oiestad EL, Brochmann GW, Eliassen E, Moe L (2020)
Determination of anticoagulant rodenticides in faeces of exposed dogs and in a healthy dog population
Acta Vet. Scand., 62 (1), 30
DOI 10.1186/s13028-020-00531-5

Publications 2019

Ask KS, Lid M, Oiestad EL, Pedersen-Bjergaard S, Gjelstad A (2019)
Liquid-phase microextraction in 96-well plates - calibration and accurate quantification of pharmaceuticals in human plasma samples
J. Chromatogr. A, 1602, 117-123
DOI 10.1016/j.chroma.2019.06.013

Bretteville-Jensen AL, Andreas JB, Gjersing L, Oiestad EL, Gjerde H (2019)
Identification and Assessment of Drug-User Groups Among Nightlife Attendees: Self-Reports, Breathalyzer-Tests and Oral Fluid Drug Tests
Eur. Addict. Res., 25 (2), 93-102
DOI 10.1159/000497318

Bruun LD, Kjeldstadli K, Temte V, Birdal M, Bachs L, Langodegard M, Strand DH, Gaare KI, Oiestad E, Hoiseth G (2019)
Detection Time of Oxazepam and Zopiclone in Urine and Oral Fluid after Experimental Oral Dosing
J. Anal. Toxicol., 43 (5), 369-377
DOI 10.1093/jat/bky083

Kvello AMS, Andersen JM, Oiestad EL, Steinsland S, Aase A, Morland J, Bogen IL (2019)
A Monoclonal Antibody against 6-Acetylmorphine Protects Female Mice Offspring from Adverse Behavioral Effects Induced by Prenatal Heroin Exposure
J. Pharmacol. Exp. Ther., 368 (1), 106-115
DOI 10.1124/jpet.118.251504

Oiestad EL, Krabseth HM, Huestis MA, Skulberg A, Vindenes V (2019)
Interpreting oral fluid drug results in prisoners: monitoring current drug intake and detection times for drugs self-administered prior to detention
Forensic Toxicol., 37 (1), 59-74
DOI 10.1007/s11419-018-0434-9

Seljetun KO, Eliassen E, Madslien K, Viljugrein H, Vindenes V, Oiestad EL, Moe L (2019)
PREVALENCE OF ANTICOAGULANT RODENTICIDES IN FECES OF WILD RED FOXES (VULPES VULPES) IN NORWAY
J. Wildl. Dis., 55 (4), 834-843
DOI 10.7589/2019-01-027

Temte V, Kjeldstadli K, Bruun LD, Birdal M, Bachs L, Karinen R, Middelkoop G, Oiestad E, Hoiseth G (2019)
An Experimental Study of Diazepam and Alprazolam Kinetics in Urine and Oral Fluid Following Single Oral Doses
J. Anal. Toxicol., 43 (2), 104-111
DOI 10.1093/jat/bky062

Vardal L, Oiestad EL, Gjelstad A, Jensen H, Pedersen-Bjergaard S (2019)
Electromembrane extraction with solvent modification of the acceptor solution: improved mass transfer of drugs of abuse from human plasma
Bioanalysis, 11 (8), 755-771
DOI 10.4155/bio-2018-0308

Publications 2018

Ask KS, Oiestad EL, Pedersen-Bjergaard S, Gjelstad A (2018)
Dried blood spots and parallel artificial liquid membrane extraction-A simple combination of microsampling and microextraction
Anal. Chim. Acta, 1009, 56-64
DOI 10.1016/j.aca.2018.01.024

Oiestad AML, Berg T, Eliassen E, Wiklund T, Sand K, Oiestad EL (2018)
Separation of isomers of new psychoactive substances and isotope-labeled amphetamines using UHPSFC-MS/MS and UHPLC-MS/MS
J. Liq. Chromatogr. Relat. Technol., 41 (7), 391-400
DOI 10.1080/10826076.2017.1388818

Oiestad AML, Karinen R, Rogde S, Nilsen S, Eldor KBB, Brochmann GW, Arnestad M, Oiestad EL, Peres MD, Kristoffersen L, Vindenes V (2018)
Comparative Study of Postmortem Concentrations of Antidepressants in Several Different Matrices
J. Anal. Toxicol., 42 (7), 446-458
DOI 10.1093/jat/bky030

Thaulow CH, Oiestad AML, Rogde S, Karinen R, Brochmann GW, Andersen JM, Hoiseth G, Handal M, Morland J, Arnestad M, Oiestad EL, Strand DH, Vindenes V (2018)
Metabolites of Heroin in Several Different Post-mortem Matrices
J. Anal. Toxicol., 42 (5), 311-320
DOI 10.1093/jat/bky002

Vardal L, Oiestad EL, Gjelstad A, Pedersen-Bjergaard S (2018)
Electromembrane extraction of substances with weakly basic properties: a fundamental study with benzodiazepines
Bioanalysis, 10 (10), 769-781
DOI 10.4155/bio-2018-0030

Vardal L, Wong G, Oiestad AML, Pedersen-Bjergaard S, Gjelstad A, Oiestad EL (2018)
Rapid determination of designer benzodiazepines, benzodiazepines, and Z-hypnotics in whole blood using parallel artificial liquid membrane extraction and UHPLC-MS/MS
Anal. Bioanal. Chem., 410 (20), 4967-4978
DOI 10.1007/s00216-018-1147-y

Publications 2017

Hjelmeland K, Gustavsen I, Oiestad EL, Oiestad AML, Hoiseth G, Morland J (2017)
Zopiclone concentrations in oral fluid and blood after, administration of therapeutic doses of zopiclone
Forensic Sci.Int., 278, 177-183
DOI 10.1016/j.forsciint.2017.07.004

Vallersnes OM, Persett PS, Oiestad EL, Karinen R, Heyerdahl F, Hovda KE (2017)
Underestimated impact of novel psychoactive substances: laboratory confirmation of recreational drug toxicity in Oslo, Norway
Clin. Toxicol., 55 (7), 636-644
DOI 10.1080/15563650.2017.1312002

Vardal L, Askildsen HM, Gjelstad A, Oiestad EL, Edvardsen HME, Pedersen-Bjergaard S (2017)
Parallel artificial liquid membrane extraction of new psychoactive substances in plasma and whole blood
J. Chromatogr. B, 1048, 77-84
DOI 10.1016/j.jchromb.2017.02.010

Vardal L, Gjelstad A, Huang C, Oiestad EL, Pedersen-Bjergaard S (2017)
Efficient discrimination and removal of phospholipids during electromembrane extraction from human plasma samples
Bioanalysis, 9 (8), 631-641
DOI 10.4155/bio-2017-0027

Vevelstad M, Oiestad EL, Nerem E, Arnestad M, Bogen IL (2017)
Studies on Para-Methoxymethamphetamine (PMMA) Metabolite Pattern and Influence of CYP2D6 Genetics in Human Liver Microsomes and Authentic Samples from Fatal PMMA Intoxications
Drug Metab. Dispos., 45 (12), 1326-1335
DOI 10.1124/dmd.117.077263

Øiestad EL, Karinen RA, Haugland K, Øiestad ML (2017)
Chapter 101 Screening of Synthetic Cannabinoids
In Handbook of Cannabis and Related Pathologies (Victor R. Preedy, ed.), Academic Press, San Diego, 1, 981-997
DOI 10.1016/B978-0-12-800756-3.00118-6, PublikaID 291, ISBN 978-0-12-800756-3

Publications 2016

Andas HT, Enger A, Oiestad AML, Vindenes V, Christophersen AS, Huestis MA, Oiestad EL (2016)
Extended Detection of Amphetamine and Methamphetamine in Oral Fluid
Ther. Drug Monit., 38 (1), 114-119
DOI 10.1097/FTD.0000000000000248

Ask KS, Bardakci T, Parmer MP, Halvorsena TG, Oiestad EL, Pedersen-Bjergaard S, Gjelstad A (2016)
Parallel artificial liquid membrane extraction as an efficient tool for removal of phospholipids from human plasma
J. Pharm. Biomed. Anal., 129, 229-236
DOI 10.1016/j.jpba.2016.07.011

Gjerde H, Nordfjaern T, Bretteville-Jensen AL, Edland-Gryt M, Furuhaugen H, Karinen R, Oiestad EL (2016)
Comparison of drugs used by nightclub patrons and criminal offenders in Oslo, Norway
Forensic Sci.Int., 265, 1-5
DOI 10.1016/j.forsciint.2015.12.029

Krabseth HM, Tuv SS, Strand MC, Karinen RA, Wiik E, Vevelstad MS, Westin AA, Oiestad EL, Vindenes V (2016)
New psychoactive substances
Tidsskr. Nor. Laegeforen., 136 (8), 714-717

Kvello AMS, Andersen JM, Oiestad EL, Morland J, Bogen IL (2016)
Pharmacological Effects of a Monoclonal Antibody against 6-Monoacetylmorphine upon Heroin-Induced Locomotor Activity and Pharmacokinetics in Mice
J. Pharmacol. Exp. Ther., 358 (2), 181-189
DOI 10.1124/jpet.116.233510

Oiestad EL, Oiestad AML, Gjelstad A, Karinen R (2016)
Oral fluid drug analysis in the age of new psychoactive substances
Bioanalysis, 8 (7), 691-710
DOI 10.4155/bio-2015-0027

Tuv SS, Krabseth HM, Strand MC, Karinen RA, Wiik E, Vevelstad MS, Westin AA, Oiestad EL, Vindenes V (2016)
New drugs right from the online
Tidsskr. Nor. Laegeforen., 136 (8), 721-723

Vevelstad M, Oiestad EL, Bremer S, Bogen IL, Zackrisson AL, Arnestad M (2016)
Is toxicity of PMMA (paramethoxymethamphetamine) associated with cytochrome P450 pharmacogenetics?
Forensic Sci.Int., 261, 137-147
DOI 10.1016/j.forsciint.2016.02.027

Publications 2015

Gottas A, Ripel A, Boix F, Vindenes V, Morland J, Oiestad EL (2015)
Determination of dopamine concentrations in brain extracellular fluid using microdialysis with short sampling intervals, analyzed by ultra high performance liquid chromatography tandem mass spectrometry
J. Pharmacol. Toxicol. Methods, 74, 75-79
DOI 10.1016/j.vascn.2015.06.002

Karinen R, Tuv SS, Oiestad EL, Vindenes V (2015)
Concentrations of APINACA, 5F-APINACA, UR-144 and its degradant product in blood samples from six impaired drivers compared to previous reported concentrations of other synthetic cannabinoids
Forensic Sci.Int., 246, 98-103
DOI 10.1016/j.forsciint.2014.11.012

Karinen R, Vindenes V, Hasvold I, Olsen KM, Christophersen AS, Oiestad E (2015)
Determination of a selection of anti-epileptic drugs and two active metabolites in whole blood by reversed phase UPLC-MS/MS and some examples of application of the method in forensic toxicology cases
Drug Test. Anal., 7 (7), 634-644
DOI 10.1002/dta.1733

Nordal K, Oiestad EL, Enger A, Christophersen AS, Vindenes V (2015)
Detection Times of Diazepam, Clonazepam, and Alprazolam in Oral Fluid Collected From Patients Admitted to Detoxification, After High and Repeated Drug Intake
Ther. Drug Monit., 37 (4), 451-460
DOI 10.1097/FTD.0000000000000174

Publications 2014

Andas HT, Krabseth HM, Enger A, Marcussen BN, Haneborg AM, Christophersen AS, Vindenes V, Oiestad EL (2014)
Detection Time for THC in Oral Fluid After Frequent Cannabis Smoking
Ther. Drug Monit., 36 (6), 808-814
DOI 10.1097/FTD.0000000000000092

Edvardsen HME, Karinen R, Moan IS, Oiestad EL, Christophersen AS, Gjerde H (2014)
Use of alcohol and drugs among health professionals in Norway: a study using data from questionnaires and samples of oral fluid
J. Occup. Med. Toxicol., 9, 8
DOI 10.1186/1745-6673-9-8

Eibak LEE, Rasmussen KE, Oiestad EL, Pedersen-Bjergaard S, Gjelstad A (2014)
Parallel electromembrane extraction in the 96-well format
Anal. Chim. Acta, 828, 46-52
DOI 10.1016/j.aca.2014.04.038

Gjerde H, Sousa TR, De Boni R, Christophersen AS, Limberger RP, Zancanaro I, Oiestad EL, Normann PT, Morland J, Pechansky F (2014)
A comparison of alcohol and drug use by random motor vehicle drivers in Brazil and Norway
Int. J. Drug Policy, 25 (3), 393-400
DOI 10.1016/j.drugpo.2014.01.019

Gottas A, Boix F, Oiestad EL, Vindenes V, Morland J (2014)
Role of 6-monoacetylmorphine in the acute release of striatal dopamine induced by intravenous heroin
Int. J. Neuropsychopharmacol., 17 (9), 1357-1365
DOI 10.1017/S1461145714000169

Langel K, Gjerde H, Favretto D, Lillsunde P, Oiestad EL, Ferrara SD, Verstraete AG (2014)
Comparison of drug concentrations between whole blood and oral fluid
Drug Test. Anal., 6 (5), 461-471
DOI 10.1002/dta.1532

Oiestad EL, Karinen R, Christophersen AS, Vindenes V, Bachs L (2014)
Analyses of Beverage Remains in Drug Rape Cases Revealing Drug Residues - The Possibility of Contamination from Drug Concentrated Oral Fluid or Oral Cavity Contained Tablets
J. Forensic Sci., 59 (1), 208-210
DOI 10.1111/1556-4029.12270

Tuv SS, Krabseth H, Karinen R, Olsen KM, Oiestad EL, Vindenes V (2014)
Prevalence of synthetic cannabinoids in blood samples from Norwegian drivers suspected of impaired driving during a seven weeks period
Accid. Anal. Prev., 62, 26-31
DOI 10.1016/j.aap.2013.09.009

Vindenes V, Enger A, Nordal K, Johansen U, Christophersen AS, Oiestad EL (2014)
Very long Detection Times after High and repeated intake of Heroin and Methadone, measured in Oral Fluid
Scand. J. Forensic Sci., 20 (2), 34-41
DOI 10.2478/sjfs-2014-0004

Vindenes V, Enger A, Nordal K, Johansen U, Cristophersen AS, Øiestad EL (2014)
Very long Detection Times after High and repeated intake of Heroin and Methadone, measured in Oral Fluid
Scandinavian Journal of Forensic Science, 20 (2), 34-41
DOI 10.2478/sjfs-2014-0004, PublikaID 292

Publications 2013

Gjerde H, Christophersen AS, Normann PT, Assum T, Oiestad EL, Morland J (2013)
Norwegian Roadside Survey of Alcohol and Drug Use by Drivers (2008-2009)
Traffic Inj. Prev., 14 (5), 443-452
DOI 10.1080/15389588.2012.728016

Gottas A, Oiestad EL, Boix F, Vindenes V, Ripel A, Thaulow CH, Morland J (2013)
Levels of heroin and its metabolites in blood and brain extracellular fluid after i.v. heroin administration to freely moving rats
Br. J. Pharmacol., 170 (3), 546-556
DOI 10.1111/bph.12305

Lund HME, Gjerde H, de Courtade SMB, Oiestad EL, Christophersen AS (2013)
A Norwegian Study of the Suitability of Hair Samples in Epidemiological Research of Alcohol, Nicotine and Drug Use
J. Anal. Toxicol., 37 (6), 362-368
DOI 10.1093/jat/bkt038

Lund HME, Gjerde H, DeCourtade SM, Øiestad EL, Christophersen AS (2013)
A Norwegian study of the suitability of hair samples in epidemiological research of alcohol, nicotine and drug use
J Anal Toxicol, 37 (6), 362-8
DOI 10.1093/jat/bkt038 , PublikaID 266

Oiestad EL, Johansen U, Christophersen AS, Karinen R (2013)
Screening of synthetic cannabinoids in preserved oral fluid by UPLC-MS/MS
Bioanalysis, 5 (18), 2257-2268
DOI 10.4155/bio.13.182

Publications 2012

Gottas A, Oiestad EL, Boix F, Ripel A, Thaulow CH, Pettersen BS, Vindenes V, Morland J (2012)
Simultaneous measurement of heroin and its metabolites in brain extracellular fluid by microdialysis and ultra performance liquid chromatography tandem mass spectrometry
J. Pharmacol. Toxicol. Methods, 66 (1), 14-21
DOI 10.1016/j.vascn.2012.04.009

Jamt REG, Gjelstad A, Eibak LEE, Oiestad EL, Christophersen AS, Rasmussen KE, Pedersen-Bjergaard S (2012)
Electromembrane extraction of stimulating drugs from undiluted whole blood
J. Chromatogr. A, 1232, 27-36
DOI 10.1016/j.chroma.2011.08.058

Storhaug LW, Enger A, Hjelmeland K, Oiestad EL, Vindenes V (2012)
Prolonged excretion of 7-aminoclonazepam in urine after repeated ingestion of clonazepam: A case report
Forensic Sci.Int., 222 (1-3), E33-E35
DOI 10.1016/j.forsciint.2012.06.018

Vevelstad M, Oiestad EL, Middelkoop G, Hasvold I, Lilleng P, Delaveris GJM, Eggen T, Morland J, Arnestad M (2012)
The PMMA epidemic in Norway: Comparison of fatal and non-fatal intoxications
Forensic Sci.Int., 219 (1-3)
DOI 10.1016/j.forsciint.2011.12.014

Vindenes V, Lund HME, Andresen W, Gjerde H, Ikdahl SE, Christophersen AS, Oiestad EL (2012)
Detection of drugs of abuse in simultaneously collected oral fluid, urine and blood from Norwegian drug drivers
Forensic Sci.Int., 219 (1-3)
DOI 10.1016/j.forsciint.2012.01.001

Vindenes V, Lund HME, Andresen W, Gjerde H, Ikdahl SE, Christophersen AS, Øiestad EL (2012)
Detection of drugs of abuse in simultaneously collected oral fluid, urine and blood from Norwegian drug drivers
Forensic Sci Int, 219 (1-3), 165
PublikaID 265

Publications 2011

Gjerde H, Øiestad EL, Christophersen AS (2011)
Using biological samples in epidemiological research on drugs of abuse
Norsk Epidemiologi, 21 (1), 5-14
PublikaID 293

Karinen R, Oiestad EL, Andresen W, Smith-Kielland A, Christophersen A (2011)
Comparison of the Stability of Stock Solutions of Drugs of Abuse and Other Drugs Stored in a Freezer, Refrigerator, and at Ambient Temperature for Up to One Year
J. Anal. Toxicol., 35 (8), 583-590
DOI 10.1093/anatox/35.8.583

Lund HME, Oiestad EL, Gjerde H, Christophersen AS (2011)
Drugs of abuse in oral fluid collected by two different sample kits - Stability testing and validation using ultra performance tandem mass spectrometry analysis
J. Chromatogr. B, 879 (30), 3367-3377
DOI 10.1016/j.jchromb.2011.09.002

Lund HME, Øiestad EL, Gjerde H, Christophersen AS (2011)
Drugs of abuse in oral fluid collected by two different sample kits-stability testing and validation using ultra performance tandem mass spectrometry analysis.
J Chromatogr B Analyt Technol Biomed Life Sci, 879 (30), 3367-77
DOI 10.1016/j.jchromb.2011.09.002 , PublikaID 263

Oiestad EL, Johansen U, Oiestad AML, Christophersen AS (2011)
Drug Screening of Whole Blood by Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry
J. Anal. Toxicol., 35 (5), 280-293
DOI 10.1093/anatox/35.5.280

Vindenes V, Yttredal B, Oiestad EL, Waal H, Bernard JP, Morland JG, Christophersen AS (2011)
Oral Fluid is a Viable Alternative for Monitoring Drug Abuse: Detection of Drugs in Oral Fluid by Liquid Chromatography-Tandem Mass Spectrometry and Comparison to the Results from Urine Samples from Patients Treated with Methadone or Buprenorphine
J. Anal. Toxicol., 35 (1), 32-39
DOI 10.1093/anatox/35.1.32

Publications 2010

Gjerde H, Oiestad EL, Oiestad AML, Langodegard M, Gustavsen I, Hjelmeland K, Bernard JP, Christophersen AS (2010)
Comparison of Zopiclone Concentrations in Oral Fluid Sampled with Intercept (R) Oral Specimen Collection Device and Statsure Saliva Sampler (TM) and Concentrations in Blood
J. Anal. Toxicol., 34 (9), 590-593
DOI 10.1093/jat/34.9.590

Karinen R, Oiestad EL, Andresen W, Wethe G, Smith-Kielland A, Christophersen A (2010)
Comparison of Ethanol and Other Drugs of Abuse Concentrations in Whole Blood Stored in Venoject (R) Glass and Plastic and Venosafe (TM) Plastic Evacuated Tubes
J. Anal. Toxicol., 34 (7), 420-428
DOI 10.1093/jat/34.7.420

Publications 2009

Oiestad EL, Johansen U, Opdal MS, Bergan S, Christophersen AS (2009)
Determination of Digoxin and Digitoxin in Whole Blood
J. Anal. Toxicol., 33 (7), 372-378
DOI 10.1093/jat/33.7.372

Publications 2008

Gjerde H, Normann PT, Pettersen BS, Assum T, Aldrin M, Johansen U, Kristoffersen L, Oiestad EL, Christophersen AS, Morland J (2008)
Prevalence of alcohol and drugs among Norwegian motor vehicle drivers: A roadside survey
Accid. Anal. Prev., 40 (5), 1765-1772
DOI 10.1016/j.aap.2008.06.015

Publications 2007

Hegstad S, Khiabani HZ, Oiestad EL, Berg T, Christophersen AS (2007)
Rapid quantification of buprenorphine-glucuronide and norbuprenorphine-glucuronide in human urine by LC-MS-MS
J. Anal. Toxicol., 31 (4), 214-219
DOI 10.1093/jat/31.4.214

Kristoffersen L, Oiestad EL, Opdal MS, Krogh M, Lundanes E, Christophersen AOS (2007)
Simultaneous determination of 6 beta-blockers, 3 calcium-channel antagonists, 4 angiotensin-II antagonists and 1 antiarrhytmic drug in post-mortem whole blood by automated solid phase extraction and liquid chromatography mass spectrometry - Method development and robustness testing by experimental design
J. Chromatogr. B, 850 (1-2), 147-160
DOI 10.1016/j.jchromb.2006.11.030

Oiestad EL, Johansen U, Christophersen AS (2007)
Drug screening of preserved oral fluid by liquid chromatography-tandem mass spectrometry
Clin. Chem., 53 (2), 300-309
DOI 10.1373/clinchem.2006.074237

Publications 2000

Øiestad EL, Harvey JN, Uggerud E (2000)
Unimolecular reactions of protonated hydrogen peroxide: A quantum chemical survey
Journal of Physical Chemistry A, 104, 8382-8388
DOI 10.1021/jp000480g, PublikaID 369

Øiestad EL, Uggerud E (2000)
Dipolar H-2 activation by H2O
Chemical Communications, 1 (10), 831-832
DOI 10.1039/b001209m, PublikaID 370

Øiestad EL, Uggerud E (2000)
Competition between proton transfer and hydride abstraction in chemical ionisation mass spectrometry of ethylamine
International Journal of Mass Spectrometry, 199 (1-3), 91-105
PublikaID 371

Publications 1999

Øiestad EL, Uggerud E (1999)
The unimolecular chemistry of protonated hydroxylamine
International Journal of Mass Spectrometry, 185, 231-240
PublikaID 368

Publications 1997

Øiestad EL, Uggerud E (1997)
Unimolecular reactions of protonated hydrazine. Reaction mechanisms and dynamics from observation of metastable ion fragmentations and ab initio calculations
International Journal of Mass Spectrometry, 165, 39-47
PublikaID 367

Publications 1995

Øiestad EL, Øiestad ML, Skaane H, Ruud K, Helgaker T, Uggerud E (1995)
Loss of H-2 from CH3NH3+, CH3OH2+ and CH3FH+ - Reaction-Mechanisms and Dynamics from Observation of Metastable Ion Fragmentations and Ab-Initio Calculations Reaction-Mechanisms
Europeamn Mass Spectrometry, 1 (2), 121-129
PublikaID 366