期刊
CHEMICAL PHYSICS LETTERS
卷 342, 期 3-4, 页码 299-302出版社
ELSEVIER
DOI: 10.1016/S0009-2614(01)00501-2
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A novel electron-ion reaction mimicking positron capture is reported for gas-phase polypeptide di-anions. Bombardment of the latter by > 10 eV electrons produced electron detachment followed by backbone dissociation, noticeably cleavage of the N-C-alpha bond. On the other hand, reaction with hydrogen cations resulted in losses of neutral groups but not in backbone cleavage. It is proposed that the N-C-alpha dissociation is due to recombination along the peptide chain of a positive radical charge (hole) with a negative charge. The new reaction is likely to find application in mass spectrometry for primary structure determination of acidic polypeptides. (C) 2001 Elsevier Science B.V. All rights reserved.
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