Positive and negative ions of the amino acid histidine formed in low-energy electron collisions.

ABSTRACT: Histidine is an aromatic amino acid crucial for the biological functioning of proteins and enzymes. When biological matter is exposed to ionising radiation, highly energetic particles interact with the surrounding tissue which leads to efficient formation of low-energy electrons. In the present study, the interaction of low-energy electrons with gas-phase histidine is studied at a molecular level in order to extend the knowledge of electron-induced reactions with amino acids. We report both on the formation of positive ions formed by electron ionisation and negative ions induced by electron attachment. The experimental data were complemented by quantum chemical calculations. Specifically, the free energies for possible fragmentation reactions were derived for the τ and the π tautomer of hi

SUBMITTER: Meißner R 

PROVIDER: S-EPMC6916310 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature