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. 2014 Aug;55(8):1797–1809. doi: 10.1194/jlr.D050302

Fig. 1.

Fig. 1.

A: Negative ionization mode high-resolution (R = 100,000)/accurate mass spectrum of a ganglioside-enriched modified Svennerholm upper phase retina lipid extract (sample concentration corresponding to 1.0 mg/ml of original retina tissue extracted). Inset: expanded region of the mass spectrum from m/z 720 to 750 showing doubly deprotonated ganglioside GD3 species. B: Negative ionization mode high-resolution (R = 100,000)/accurate mass spectrum of the modified Svennerholm lower phase retina lipid extract. Inset: expanded region of the mass spectrum from m/z 720 to 750. I.S., internal standard. PC(14:0/14:0) (0.5 μM).