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. 2011 Jun 15;83(14):5754–5761. doi: 10.1021/ac201123t

Figure 2.

Figure 2

(A) Positive ion mode DESI-MS spectrum of the direct analysis of a hophornbeam (O. virginiana) leaf. Spray solvent was methanol/water (80:20) at a flow rate of 3 μL/min. Protonated, sodiated, and potassiated molecules were detected at m/z 679, 701, and 717, respectively. (B) DESI-MS/MS spectrum of the isolated protonated molecule, m/z 679. (C) Proposed structure of the chlorophyll catabolite corresponding to the ion at m/z 679, the Ov-NCC-1. The structure shown is proposed considering previous data.3,48 Characteristic fragmentations due to the losses of methanol (fragment at m/z 647) and ring A (fragment at m/z 522) are marked.