Fig. 3. Representative mass spectra of lipid standards detected with (A) TiO2-DA monolith-assisted LDI MS and (B) MALDI MS using DHB as the MALDI matrix. Mass spectra in red were acquired from blank samples and mass spectra in black were acquired from samples of lipid standards. FA, fatty acids; Cer, ceramide; CL, cholesterol; PE, phosphatidylethanolamine; PC, phosphatidylcholine; GC, galactocerebroside.
