Figure 3.

The intra-day reproducibility study for matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy (MALDI-TOF MS) measurement. The same PDE sample was processed with IMAC-Cu in a single vial and spotted three times on SCOUT 600 μm AnchorChip target positions D1, D2, and D3. Eight MS signals with high, medium, and low abundances within the mass range of m/z 1–15 kDa were randomly selected for the variability assessment. The results are shown in Table 3. ^* selected MS signals.