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The b1 ion derived from methionine is a stable species

✍ Scribed by Ya-Ping Tu; Alex. G. Harrison

Book ID
101236567
Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
57 KB
Volume
12
Category
Article
ISSN
0951-4198

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✦ Synopsis

Unimolecular fragmentation of the MH ions of a number of methionine derivatives such as H-Met-OMe, H-Met-b-naphthylamide, H-Met-Gly-OH, H-Met-Ala-OH and H-Met-Phe-OH results in formation of the methionine b 1 ion (m/z 132) in significant yields. Since a-aminoacylium ions are generally unstable and not observed, it is proposed that the stable form of the b 1 ion from these methionine derivatives is methylcationated a-amino-g-thiobutyrolactone. Under low-energy collision-induced dissociation conditions this b 1 ion readily loses CO to form the a 1 ion, CH 3 SCH 2 CH 2 CH=NH 2 .

πŸ“œ SIMILAR VOLUMES

The B1-fragment Ion from Protonated Glyc
The B1-fragment Ion from Protonated Glycine is an Electrostatically-bound Ion/Molecule Complex of CH 2=NH+2 and CO
✍ W. D. van Dongen; W. Heerma; J. Haverkamp; C. G. de Koster πŸ“‚ Article πŸ“… 1996 πŸ› John Wiley and Sons 🌐 English βš– 285 KB πŸ‘ 1 views

The stability of the B,-ion from glycylglycine dipeptides was studied using collision-induced dissociation experiments and ab initi0 calculations. This study reveals that the B,-type ion from glycine should be considered as an electrostatically bound iodmoecule complex, which dissociates into a glyc