Poly-L-ornithine hydrobromide is a positively charged synthetic polyamino acid having one HBr per ornithine unit. It is a crystalline solid soluble in water that promotes cell adhesion to solid substrates in biological applications.
Poly-L-ornithine hydrobromide with a molecular weight greater than 30,000 Da is recommended for cell culture applications. The poly-L-ornithine hydrobromide (MW=49,000 Da) is easier to use because it is less viscous in solution, however the poly-L-ornithine hydrobromide with an higher molecular weight (MW=78,000 Da) has more attachement sites per polymer chain available to the cells.
Our poly-L-ornithine hydrobromide has been purified by dialysis, sterile-filtered on 0.2um, lyophilized, and stored under Ar.
Store poly-L-ornithine hydrobromide under the condition of flushing with argon and protecting from light, and below -15°C.