Sökning: "High-energy collision induced dissociation"

Hittade 4 avhandlingar innehållade orden High-energy collision induced dissociation.

  1. 1. Derivatisation of peptides for collision-induced dissociation mass spectrometry

    Författare :Ingemar Lindh; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : This study is concerned with the mass spectrometric analysis of peptides C-terminally derivatised with aminosulphonic acids. The aim was to increase the sensitivity of detection and to simplify the fragmentation patterns obtained upon collision-induced dissociation. LÄS MER

  3. 2. Simplified Routines for Sample Preparation and Analysis of Chemical Warfare Agent Degradation Products

    Författare :Raja Subramaniam; Calle Nilsson; Paula Vanninen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nerve agents; Alkyl alkylphosphonic acids; Solid phase derivatization; Fluorinated diazomethane reagent; High-energy collision induced dissociation; CID MS MS library; analytisk kemi; Analytical Chemistry;

    Sammanfattning : The thesis describes the development of new and improved methods for analyzing degradation markers from organophosphorus Chemical Warfare Agents (CWAs). Paper I and II describes an innovative and significantly improved method for the enrichment, derivatization (trimethysilylation) and GC-MS analysis of a broad range of organophosphorus CWAs degradation markers, namely the alkylphosphonic acids and a zwitterionic compound. LÄS MER

  4. 3. Chiral Recognition by Means of Mass Spectrometry

    Författare :Oleksii Rebrov; Mats Larsson; Per Johnsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chirality; Mass spectrometry; Chiral recognition; Gas phase; kemisk fysik; Chemical Physics;

    Sammanfattning : This thesis is based on experimental studies of chiral ions in gas-phase. Electrospray ion source platform (Stockholm University) and commercially available Quadrupole Time-of-Flight mass spectrometer have been used in our studies. LÄS MER

  5. 4. Fragmentation of Amino Acids and Microsolvated Peptides and Nucleotides using Electrospray Ionization Tandem Mass Spectrometry

    Författare :Henrik Johansson; Henning Schmidt; Henrik Cederquist; Jens Jensen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Atomic and molecular physics; Atom- och molekylfysik; fysik; Physics;

    Sammanfattning : This thesis presents three different series of high energy (keV) collision experiments as well as a brief scientific introduction to the field. In the first series, protonated glycine and leucine were collided with carbon dioxide and a beam attenuation method was applied to determine their total fragmentation cross sections. LÄS MER