演題概要

オーラルセッション

第1日 6月17日(水) 18:40~19:00 D会場(202)

プロトン化アミノ酸の高エネルギー電子移動解離

(大阪府大院理)
o早川滋雄請園和也藤原亮正

High-energy electron transfer dissociation (HE-ETD) of singly protonated amino acids was investigated using charge inversion mass spectrometry with alkali metal targets in which dissociations of charge-reduced neutrals were induced from the excited neutral intermediates. The dominant trapezoidal peaks of the 17 u loss in the charge inversion spectra of the protonated aliphatic amino acids were assigned to NH3 loss caused by N-Cα bond cleavage from hypervalent ammonium radical intermediates via a repulsive state; this assignment was based on the peak shape and kinetic energy release (KER) values.The triangular peaks of the 2 u loss, which were dominantly observed in all of the spectra, were assigned to H2 elimination, which involved H atom migration in the neutral radical.