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).