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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Anal Bioanal Chem. 2015 Feb 6;407(9):2519–2528. doi: 10.1007/s00216-015-8480-1

Fig. 4.

Fig. 4

The MS2 spectra of the [M + Na]+ ions of 17:0/15:0-DGDG at m/z 915.6 (a), and of the corresponding [M + Li]+ ions at m/z 899.7 (b). The losses of the fatty acid substituents in (a) are confirmed by the mass shift of the corresponding ions in (b).