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Polyethylenimine, branched

average Mw ~800 by LS, average Mn ~600 by GPC

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PEI, ethylenediamine branched
Linear Formula:
CAS Number:
MDL number:


viscous liquid

Quality Level

mol wt

average Mn ~600 by GPC
average Mw ~800 by LS

refractive index

n20/D 1.5240


1.050 g/mL at 25 °C



InChI key


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This Item
refractive index

n20/D 1.5240

refractive index

n20/D 1.5290

refractive index

n20/D 1.453

refractive index



1.050 g/mL at 25 °C


1.030 g/mL at 25 °C


1.08 g/mL at 25 °C



mol wt

average Mn ~600 by GPC

mol wt

average Mn ~10,000 by GPC, average Mw ~25,000 by LS

mol wt

average Mn ~1,800 by GPC, average Mw ~2,000 by LS

mol wt

average Mn 2100

General description

Polyethyleneimine is a hydrophilic polymerwidely used as a non-viral synthetic vector for invivo delivery of therapeutic nucleic acids. Owing to its excellentphysicochemical properties, it is applied in many fields like the separationand purification of proteins, carbon dioxide absorption, drug carriers,effluent treatment, and biological labels.


Branched PEI can be used as a precursor to synthesize conjugated polyplexes for efficient gene transfection. Conjugation of PEI with Jeffamine polyether and guanidinylation of the amino groups of PEI reduce the cytotoxicity of the polyplexes and protect them from aggregation in the presence of serum proteins.

Bamboo charcoal impregnated with PEI can be used as a CO2 adsorbent. Numerous amino groups present in PEI can react with CO2 due to acid-alkali interaction and enhance the adsorption capacity of bamboo charcoal.

It can also be used to prepare cross-linked water-soluble polymers with high coordination capabilities towards organic drug molecules.

Features and Benefits

  • Branched PEI has better complexation and buffering capacity.
  • High ion exchange capacity and affinity toward proteins.
  • SignificantDNA transfer efficiency.

Physical form

Branched polymer

Signal Word


Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Chronic 2 - Eye Dam. 1

Storage Class Code

10 - Combustible liquids



Flash Point(F)

356.0 °F

Flash Point(C)

180 °C

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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