Figure 6: Effect of combination of alkali metal salts and matrices on MALDI-TOF MS pattern of GM2. MALDI-TOF MS spectra of GM2(100 pmol) after preparation with DHB (A), DHB and LiCl-CsCl 4 nmol (B), Norharman and LiCl-CsCl 4 nmol (C). ▼, ▽, and ◆ indicate sodium adducts, lithium adducts, and cesium adducts ions, respectively.