Figure 5 | Scientific Reports

Figure 5

From: Bond-specific fragmentation of oligopeptides via electronic stopping of swift heavy ions in molecular films

Figure 5

DINeC mass spectra from (a) a freshly prepared bradykinin sample and (b) the same sample irradiated with Au ions (946 MeV). Fragments observed prior to irradiation at \(m/z = 904.3\) and 1043.5 are due to the loss of one of the molecules’ terminal arginine groups or an OH group, respectively, when the film is exposed to ambient atmosphere. SHI irradiation leads to additional fragmentation (Tab. S3); overall, fragment peaks are less abundant when compared to DINeC mass spectra of angiotensin II or neurotensin. The signal intensity close to the peak of the intact molecule (\(m/z > 1060\)) is comparable to the measurement before irradiation but appears more pronounced in (b) due to the smaller signal scale.

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