Vwm. Lee et al., STRUCTURES OF B-PRODUCT AND A-PRODUCT IONS FROM THE FRAGMENTATION OF ARGENTINATED PEPTIDES, Journal of the American Chemical Society, 120(29), 1998, pp. 7302-7309
Argentinated (silver-containing) oligopeptides fragment under low-ener
gy collision: conditions to yield abundant argentinated product ions.
The structures of the [b(2) - H + Ag](+) and [a(2) - H + Ag](+) ions h
ave been determined by means of tandem mass spectrometry and confirmed
by comparison with synthesized derivatives df the candidate [b(2) - H
+ Ag](+) ion structure. The [b(2) - H + Ag](+) ion was found to be an
N-argentinated oxazolone, which could subsequently form the [a(2) - H
+ Ag](+) ion and other product ions after collision activation. Tripe
ptides containing proline as their second residue were observed to for
m a relatively less abundant [b(2) - H + Ag](+) ion, which was postula
ted to be an argentinated ketene.