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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2016 Jan 4;27(4):622–632. doi: 10.1007/s13361-015-1328-2

Figure 1.

Figure 1

The full scan ESI mass spectrum of the hydroxyphthioceranoic and phthioceranoic acids released from alkaline hydrolysis of sulfolipids seen as the [M − H]− ions in the negative-ion mode (a), as the [M]+ ions of the AMPP derivative in positive-ion mode (b), and (c) the MALDI-TOF spectrum of the same AMPP derivative.