1P-34 PDF
大気圧下での負イオン付加体の生成と水素引き抜き反応
Hydrogen abstraction is a most important process of organic and photo chemical reactions. In this study, we investigated the gas-phase hydrogen abstraction from several different α-amino acids under atmospheric pressure conditions. We performed the collision-induced dissociation (CID) experiments for adducts [M+R]- of amino acids M with atmospheric negative ions R-, using atmospheric pressure corona discharge ionization mass spectrometry (APCDI-MS). The CID of amino acid adducts [M+59]-, except for tyrosine, brought about the production of [M-2H-H]- which was abstracted not only proton but also two hydrogen atoms from an amino group and α-position. In the case of tyrosine, the CID of [M+60]- resulted in the abundant formation of a product ion [M-H-H・]- which was abstracted one hydrogen radical from phenolic hydroxyl group. Both peak abundance of [M+59]- and [M+60]- was increased with ozone irradiation. This result suggested that chemical species originated from ozone which can abstract hydrogen atoms from α-amino acids are presented in ambient discharge area.