| 摘要 |
A method of mass spectrometry wherein lipid molecules are ionised to form a plurality of lipid parent ions and then subjected to photon-induced fragmentation to form a plurality of fragment or product ions. The position of one or more unsaturated bonds in the lipid molecules may be determined by mass analysing the fragment and product ions and analysing their intensity profile. The light source may be an incoherent light source, lamp, or non laser light source. The parent lipid ions may be caused to fragment via photon induced detachment. The photon induced fragmentation may cause the lipid parent ions to fragment indirectly; this may be via interactions with excited neutral gas molecules. The method may include analysing the intensity profile against a previous experimentally obtained intensity profile, or predicted, calculated or theoretical intensity profile. The step of determining the position of the bond may comprise determining the position of one or more C=C double bonds, carbon double bonds or vinyl bonds. |
