Thomas Berg

13C labelled internal standards—A solution to minimize ion suppression effects in liquid chromatography–tandem mass spectrometry analyses of drugs in biological samples?

Thomas Berg, Dag Helge Strand · Journal of Chromatography A · 2011 · 156 citations

Natural Sciences, Chemistry, Pharmaceutical Analysis +15

Determination of opiates and cocaine in urine by high pH mobile phase reversed phase UPLC–MS/MS

Thomas Berg, Elsa Lundanes, Asbjørg S. Christophersen et al. · Journal of Chromatography B · 2008 · 129 citations

Pharmacy, Pharmacology, Toxicology +12

Determination of 21 drugs in oral fluid using fully automated supported liquid extraction and UHPLC‐MS/MS

Anja Valen, Åse Marit Leere Øiestad, Dag Helge Strand et al. · Drug Testing and Analysis · 2016 · 58 citations

Pharmacy, Pharmaceutical Analysis, Pharmacology +17

Evaluation of 13C- and 2H-labeled internal standards for the determination of amphetamines in biological samples, by reversed-phase ultra-high performance liquid chromatography–tandem mass spectrometry

Thomas Berg, Morten Karlsen, Åse Marit Leere Øiestad et al. · Journal of Chromatography A · 2014 · 43 citations

Pharmacy, Pharmacology, Toxicology +11

Rapid Quantification of Buprenorphine-Glucuronide and Norbuprenorphine-Glucuronide in Human Urine by LC-MS-MS

Solfrid Hegstad, Hassan Z. Khiabani, Thomas Berg et al. · Journal of Analytical Toxicology · 2007 · 35 citations

Pharmacy, Pharmaceutical Analysis, Pharmacology +11