Polyethyleneimine (PEI), also known as polyethyleneimine, is a water-soluble polymer. Colorless or yellowish viscous liquid, hygroscopic, soluble in water, ethanol, insoluble in benzene. PEG-PEI, a copolymer of cationic poly (ethylene imide) (PEI) and polyethylene glycol (PEG), is a well-studied compound that significantly improves the delivery of oligonucleotides and nucleic acids (DNA, siRNA) in vitro and in vivo. By varying the MW of PEI and PEG, PEG-PEI drug conjugates, polymers, or nanoparticles with dynamic range of size, surface charge, and stability can be prepared, all of which are important for transfection efficiency. PEI-PEG-DSPE, polyethylenimine-PEGyl-phospholipid is an AB block copolymer with phospholipids at the end of PEG that can be used in drug delivery systems. DSPE, 1, 2-distearoyl-SN-glycerol-3-phosphate ethanolamine is a synthetic phospholipid that can be used as a membrane material with solubility and is suitable for the development of liposomes and phospholipid complexes.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.