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. Author manuscript; available in PMC: 2016 Oct 7.
Published in final edited form as: Analyst. 2015 Sep 2;140(19):6544–6552. doi: 10.1039/c5an01149c

Figure 4.

Figure 4

SIMS product ion spectra and images near the edge of a 7-hr biofilm (a) Tandem MS of m/z 288 reveals prominent fragments at m/z 15908, 17209, and 18610 (red), which correspond to alkyl chain loss and rearrangement from the protonated N-oxide quinoline precursor, NQNO Characteristic fragments for C9-PQS (blue) are also observable at m/z 17507 and 18808, although at a much lower intensity Product ion images for the NQNO fragment (m/z 15908) reveal microscopic patterning, while those for C9-PQS do not (b) Tandem MS of m/z 260 reveals a similar fragmentation pattern, with prominent HQNO fragments (red) observable at m/z 15908, 17209, and m/z 18610, and minor contributions from the PQS fragments (blue) at m/z 17507 and 18808 Microscopic patterning is observed for the NQNO fragment, but not the PQS fragment.