E
Elin Johnsen
Researcher at University of Oslo
Publications - 5
Citations - 241
Elin Johnsen is an academic researcher from University of Oslo. The author has contributed to research in topics: Hydrophilic interaction chromatography & 3'-Phosphoadenosine-5'-phosphosulfate. The author has an hindex of 5, co-authored 5 publications receiving 200 citations.
Papers
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Journal ArticleDOI
Proteomics tools reveal startlingly high amounts of oxytocin in plasma and serum
Ole Kristian Brandtzaeg,Elin Johnsen,Hanne Roberg-Larsen,Knut Fredrik Seip,Evan L. MacLean,Evan L. MacLean,Laurence R. Gesquiere,Siri Leknes,Siri Leknes,Elsa Lundanes,Steven Ray Wilson +10 more
TL;DR: A robust nano liquid chromatography-mass spectrometry (nanoLC-MS) platform for measuring the total amount of OT in human plasma/serum and results were obtained when combining R/A and ELISA.
Journal ArticleDOI
Hydrophilic interaction chromatography of nucleoside triphosphates with temperature as a separation parameter
Elin Johnsen,Steven Ray Wilson,Ingvild Odsbu,Andreas Krapp,Helle Malerod,Kirsten Skarstad,Elsa Lundanes +6 more
TL;DR: The polymer-based ZIC-pHILIC column gave significantly better separations and peak shape than a silica-based X-ray diffraction column, and could be used to fine tune separation.
Journal ArticleDOI
Liquid chromatography-mass spectrometry platform for both small neurotransmitters and neuropeptides in blood, with automatic and robust solid phase extraction
TL;DR: A diverse range of NTs, e.g. peptides oxytocin and vasopressin, monoamines adrenaline and serotonin, and amino acid GABA, can be simultaneously identified/measured in small samples, using an analytical platform based on liquid chromatography and high-resolution mass spectrometry (LC-MS).
Journal ArticleDOI
A critical evaluation of Amicon Ultra centrifugal filters for separating proteins, drugs and nanoparticles in biosamples.
Elin Johnsen,Ole Kristian Brandtzaeg,Tore Vehus,Hanne Roberg-Larsen,Vanya Bogoeva,Ornela Ademi,Jon Hildahl,Elsa Lundanes,Steven Ray Wilson +8 more
TL;DR: The centrifugation filters are well suited for separating drugs and nanoparticles in simple aqueous solutions, but significantly less so for biological samples, as common drug-protein binding disruptors can dissolve NPs or be incompatible with LC-MS instrumentation.
Journal ArticleDOI
Determination of 3'-phosphoadenosine-5'-phosphosulfate in cells and Golgi fractions using hydrophilic interaction liquid chromatography-mass spectrometry.
Rua Kareem Dowood,Ravi Adusumalli,Emil Tykesson,Elin Johnsen,Elsa Lundanes,Kristian Prydz,Steven Ray Wilson +6 more
TL;DR: A liquid chromatography-mass spectrometry approach for measuring PAPS was developed, employing hydrophilic interaction liquid Chromatography (HILIC), which is highly suited for separating very polar/charged compounds, and is compatible with electrospray MS.