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https://www.nist.gov/publications/characterization-linear-and-branched-polyethylenimine-pei-esi-ms-and-maldi-tof-ms
Characterization of Linear and Branched Polyethylenimine (PEI) by ESI-MS and MALDI-TOF-MS | NIST
Polyethylenimine (PEI) is being used as a DNA transfection agent.
esi mscharacterizationlinearbranchedpolyethylenimine