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. Author manuscript; available in PMC: 2015 Aug 28.
Published in final edited form as: Eur J Mass Spectrom (Chichester). 2015;21(3):275–285. doi: 10.1255/ejms.1366

Figure 4.

Figure 4

The graph compares the relative intensity of 2,4An fragments obtained from dp6 CSA and DS with the standard error bar from triplicate runs. Several 2,4An ions are found in the mass spectra, but only 2,4A3 and [2,4A5+Na]2− had the diagnostic qualities discussed in the text. The 2,4A3 fragment ion shows less of a difference between the two uronic acid epimers than other 2,4An ions closer to the reducing end, namely the [2,4A5+Na]2− ion, a feature that is found for the mass spectra of all the chain lengths studied here.