Browsing NTNU Open by Author "Johansen, Jon Eigill"
Now showing items 1-4 of 4
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Economical Synthesis of 13C-Labeled Opiates, Cocaine Derivatives and Selected Urinary Metabolites by Derivatization of the Natural Products
Karlsen, Morten; Liu, Huiling; Johansen, Jon Eigill; Hoff, Bård Helge (Journal article; Peer reviewed, 2015)The illegal use of opiates and cocaine is a challenge world-wide, but some derivatives are also valuable pharmaceuticals. Reference samples of the active ingredients and their metabolites are needed both for controlling ... -
Nuclear magnetic resonance as a tool to determine chlorine percentage of chlorinated paraffin mixtures
Valderhaug, Solveig; Huiling, Liu; Gorovoy, Alexey; Johansen, Jon Eigill; van Mourik, Louise; de Boer, Jacob; Gautun, Odd Reidar (Peer reviewed; Journal article, 2022)A new simple method for chlorine percentage calculations (method C), from proton nuclear magnetic resonance (1H NMR) spectroscopy, has been established and applied to an industrial chlorinated paraffin (CP) mixture and 13 ... -
Synthesis of [13C4]-labeled ∆9-tetrahydrocannabinol and 11-nor-9-carboxy-∆9-tetrahydrocannabinol as internal standards for reducing ion supressing/alteration effects in LC/MS-MS quantification
Karlsen, Morten; Liu, Huiling; Johansen, Jon Eigill; Hoff, Bård Helge (Journal article; Peer reviewed, 2014)(−)-Δ9-Tetrahydrocannabinol is the principal psychoactive component of the cannabis plant and also the active ingredient in some prescribed drugs. To detect and control misuse and monitor administration in clinical ... -
Synthesis, identification, chiral separation and crystal structure of (3R,4R,7S,8S)-3,4,7,8-tetrachlorodecane and its stereoisomers
Valderhaug, Solveig; Paškanovác, Natalie; Tůma, Jiří; Herciková, Jana; Eigner, Václav; Liu, Huiling; Gorovoy, Alexey; Johansen, Jon Eigill; Gautun, Odd Reidar (Peer reviewed; Journal article, 2023)Chlorinated paraffins (CPs) are a notoriously known class of compounds that stand amongst the most wide-spread persistent organic pollutants. Therefore, their reliable, repeatable, and reproducible quantitative analysis ...