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. Author manuscript; available in PMC: 2009 Aug 17.
Published in final edited form as: Eur J Lipid Sci Technol. 2009;111(1):39–52. doi: 10.1002/ejlt.200800117

Figure 4.

Figure 4

Shotgun lipidomics analyses of sphingolipid molecular species before and after treatment of a mouse cortex lipid extract with lithium methoxide in the positive-ion mode in the presence of a small amount of LiOH. The mass spectra (A) and (B) were acquired directly from a lipid extract of mouse cortex before and after treatment with lithium methoxide, respectively, as illustrated in Fig. 3. IS denotes internal standard. Both spectra are displayed after being normalized to the base peak in each spectrum.