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MALDI-TOF MS spectrums of polymers with the cationization reagent (A) and without the cationization reagent (B). The effect of different ratios of the cationization reagent (C), different ratios of the matrix (D), and laser energy (E) on the polymer ionization efficiency. Blue, orange, gray, and yellow colors indicate the peak intensity of PEG-6000, PVPK12, KPOP-5040, and DL-4000, respectively.
