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. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: J Am Soc Mass Spectrom. 2015 May 6;26(7):1103–1114. doi: 10.1007/s13361-015-1125-y

Product ion spectra derived from CID of (a) the ion/ion complex between angiotensin III (RVYIHPF) and sulfate radical anion, (b) the radical peptide cation of angiotensin III, and (c) protonated angiotensin III. Asterisks (*) indicate ammonia losses, degree signs (°) indicate water losses, and the lightning bolt ( ) indicates species subjected to CID. Loss of 106 Da indicates loss of p-quinomethide (C₇H₆O) from the tyrosine side-chain.

Inline graphic — Product ion spectra derived from CID of (a) the ion/ion complex between angiotensin III (RVYIHPF) and sulfate radical anion, (b) the radical peptide cation of angiotensin III, and (c) protonated angiotensin III. Asterisks (*) indicate ammonia losses, degree signs (°) indicate water losses, and the lightning bolt ( ) indicates species subjected to CID. Loss of 106 Da indicates loss of p-quinomethide (C₇H₆O) from the tyrosine side-chain.