Fig. 19 Discrepancies between ion maps produced by DHB and DAN matrices in the positive ionization mode.
Similar effects are observed during solvent changes for the same matrix. Exemplary, for the 9AA in 100% methanol, we saw the ion map for m/z 281 on a tissue slice in the white matter only, whereas for the 9AA matrix with 70% ethanol/water solution, the same signal is distributed all over the sample (see: Fig.20).