✦ LIBER ✦
Factors affecting immonium ion intensities in the high-energy collision-induced decomposition spectra of peptides
✍ Scribed by T. Madden; K. J. Welham; M. A. Baldwin
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 347 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
Abstract
Each amino acid in a peptide has a characteristic immonium ion (H~2~N^+^CHR), the presence of which in a mass spectrum can indicate the presence of that amino acid. High‐energy collision‐induced decomposition studies on small peptide ions formed by fast atom bombardment showed the relative intensities of these immonium ions to be dependent on the relative positions of the amino acids in the peptide chain: C‐terminal, N‐terminal or in‐chain. Evidence in favour of competition in the formation of immonium ions is presented.