FORMATION AND FRAGMENTATIONS OF ORGANOMETALLIC COMPLEXES INVOLVING ALIPHATIC ALPHA-AMINO-ACIDS AND TRANSITION-METAL CATIONS - A PLASMA DESORPTION MASS-SPECTROMETRY STUDY
S. Bouchonnet et al., FORMATION AND FRAGMENTATIONS OF ORGANOMETALLIC COMPLEXES INVOLVING ALIPHATIC ALPHA-AMINO-ACIDS AND TRANSITION-METAL CATIONS - A PLASMA DESORPTION MASS-SPECTROMETRY STUDY, Journal of mass spectrometry., 30(1), 1995, pp. 172-179
Amino acid/transition metal chloride mixtures were studied by plasma d
esorption mass spectrometry. The six aliphatic alpha-amino acids were
considered: glycine (Gly), alanine (Ala), valine (Val), leucine (Leu),
isoleucine (Ile) and proline (Pro), together with four transition met
al chloride salts: CoCl2, NiCl2, CuCl2, and FeCl2. Mixtures spectra sh
ow that MCat(+) complexes are formed where M = amino acid and Cat = Co
, Ni, Cu or FeCl. Fragmentations of MCat(+) ions lead to both organome
tallic and organic ions. Isotopic labelling has allowed to demonstrate
some fragmentation mechanisms.