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Chemical structure and molecular weight characterization of PSIA: (A) 1H-NMR spectrum (DMSO-d6); (B) FT-IR spectrum (within a KBr disk); (C) SEC charts (with PEG as standards and PEI 25 kDa as a calibration standard).
Abbreviations: PSIA, polyspermine imidazole-4, 5-amide; 1H-NMR, proton nuclear magnetic resonance; FT-IR, fourier transform infrared; SEC, size exclusion chromatography; PEG, polyethylene glycol; PEI, polyethyleneimine.
