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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2016 Oct 26;28(4):608–618. doi: 10.1007/s13361-016-1521-y

Figure 2.

Figure 2

MS2 spectrum of the derivatizing agent, 2,4-Dinitophenylhydrazine (DNPH) in positive ionization mode and proposed structures of fragment ions. (a) The dominant base peak ion in the MS2 is due to the loss of •OH. (b) While specific fragment ions m/z 78.0334 and m/z 164.0327 were dominant in the MS3 spectrum.