Leucine and isoleucine in chemical ionization and plasma desorption mass spectrometry: A comparative study

✍ Scribed by Guy Bouchoux; Sophie Bourcier; Yannik Hoppilliard; Christine Mauriac

• Book ID: 102965906
• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 802 KB
• Volume: 28
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210281015

✦ Synopsis

The NH, and CH, chemical ionization mass spectra of leucine and isoleucine are compared with their plasma desorption mass spectra. Mass-analysed ion kinetic energy (MIKE) and collision-induced dissociation (CID)/MIKE experiments are also presented and the mechanisms of the formation and dissociation of immonium ions [ M -CO,H, I + are discussed. A comparison between the various ionization techniques reveals that plasma desorption produces pseudo-molecular ions whose internal energy lies between zero and 300 kJ mol-'.