Gunnar Hagelin

• Wistrand, Lars-G; Rogstad, Astri; Hagelin, Gunnar; Roed, Line; Oulie, Inger; Gram, Andreas; Evans, Paul; Rasmussen, Henrik; Grant, Derek; Iveson, Peter; Newton, Ben & Thaning, Mikkel (2010). GE-145, a new low-osmolar dimeric radiographic contrast medium. Acta Radiologica.  ISSN 0284-1851.  51(9), s 1014- 1020 . doi: 10.3109/02841851.2010.509739
• Hvattum, Erlend; Hagelin, Gunnar & Larsen, Åsmund (1998). Study of mechanisms involved in the collision-induced dissociation of carboxylate anions from glycerophospholipids using negative ion electrospray tandem quadrupole mass spectrometry. Rapid Communications in Mass Spectrometry.  ISSN 0951-4198.  12, s 1405- 1409 Vis sammendrag

  The collision induced dissociation of the carboxylate anions from human blood phosphatdilycholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylinositol (PI) and phosphatidic acid (PA) containing the C18:0 (sn-1) and C20:4 (sn-2) fatty acyl residues was studied using normal-phase liquid chromatography coupled with negative ion electrospray tandem mass spectrometry. The product ion peak area ratio of C18:0 to C20:4 was calculated for each phospholipid species and was found to increase with increasing collision energy for all classes. For the phospholipids with a net neutral charge (PE, PC) there was a preferential loss of the sn-2 carboxylate anion (C20:4) at low collision energy while at higher energy there was a preferential loss of the sn-1 carboxylate anion (C18:0). For the phospholipids with a net negative charge (PI, PA, PS) the intensity of the sn-1 carboxylate ani on peak was equal to or higher than the sn-2 carboxylate anion peak at the energies measured. At a given collision energy the product ion peak area ratio decreased in the order of PA³ PS > PI. Studying PS and PE species at different collision energies it was f

• Antonsen, Øyvind Gunnar; Benneche, Tore; Hagelin, Gunnar & Undheim, Kjell (1989). Synthesis of Unsaturated Chloromethyl Ethers. Acta Chemica Scandinavica.  ISSN 0904-213X.  43, s 56- 61

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• Hagelin, Gunnar (2007). The Maltacines. Cyclic peptide lactone antibiotics from Bacillus subtilis.
• Larsen, Åsmund; Hagelin, Gunnar; Hvattum, Erlend; Svendsen, John Sigurd; Jensen, Einar; Kvarsnes, Arnfinn & Johansen, Jostein (2000). Collision-induced dissociation of blood glycerophospholipids. Vis sammendrag

  Abstract The aim of this study was to investigate the dissociation of the fatty acid residues from human blood glycerophospholipids with electrospray tandem quadrupole mass spectrometry. Early observations gave some indications that the main fragmentation pathways were collison energy dependent. The classes investigated were phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylinositol (PI) and phosphatidic acid (PA) containing endogenous C18:0 (sn-1 position) and C20:4 (sn-2 position) fatty acyl residues. The experiments were done using normal-phase liquid chromatography coupled to negative ion electrospray tandem mass spectrometry. The operation mode was multiple reaction monitoring (MRM) of the transitions from M-H- m/z=283.3 (C18:0) and from M-H- m/z=303.2 (C20:4). The resulting peak areas for the two transitions for each class were expressed as the ratio R: R= m/z=283.3/m/z=303.3 The ratio R was found to increase with increasing collision energy for all classes and for a g

• Larsen, Åsmund; Hvattum, Erlend; Uran, Steinar; Hagelin, Gunnar; Michelsen, Peter; Karlsson, Anders; Heidenreich, O.N.; Geibrokk, T.; Jellum, E.; Oreld, F. & Rasmussen, K.E. (1998). Characterization of phospholipids by normal phase chromatography and tandem mass spectrometry.

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