Unusual Fragmentation of β-Linked Peptides by ExD Tandem Mass Spectrometry
✍ Scribed by Nadezda P. Sargaeva; Cheng Lin; Peter B. O’Connor
- Book ID
- 107700621
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 455 KB
- Volume
- 22
- Category
- Article
- ISSN
- 1044-0305
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## Abstract The zinc complexes of diaryl bis(__p__‐nitrophenyl)porphyrins and β‐(1,3‐dinitroalkyl)tetraphenylporphyrins were studied by electrospray ionization (ESI) tandem mass spectrometry (MS/MS). All porphyrins showed the protonated molecule under ESI conditions. The protonated molecules were i
## Incident ion energy Ei and collision gas pressure have been adjusted so as to obtain a satisfactory tandem mass spectrum of the m/z 1882 ion formed from valine-gramicidin A (relative molecular mass 1881). Translational energy losses AE have been determined (at Ei = 14.8 keV) from the precise po