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. Author manuscript; available in PMC: 2014 Nov 15.
Published in final edited form as: Int J Mass Spectrom. 2013 May 31;354-356:181–187. doi: 10.1016/j.ijms.2013.05.022

Scheme 2.

Scheme 2

Proposed mechanism for fragmentation Path 1 of acylated arginine. Upon activation, the acyl-arginine undergoes deguanidination, resulting in the loss of an acyl carbodiimide (shown) or cyanamide (not shown), leaving an ornithine residue.