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Molecular weight distributions by MALDI-TOF
Example: pullulan sample.
m/Z (peak position) accurate => accurate mass
Detector response: depends on DP => uncertain estimates of relative masses
ESI-MS
Electrospray ionisation:
Sample injected as electrically charged, microscopic droplets
Vacuum => solvent evaporates => charged macro ions
Non-destructive
Adducts: Na
+
and K
+
=> multiple peaks