in the Nat prot paper (Joung et al, 2017) it is recommended a low-cost protocol for lentivirus production using PEI (Box 5).
Specifically, it is suggested to use Polyethylenimine HCl MAX, Linear, Mw 40,000 (PEI Max; Polysciences, cat. no. 24765-1).
Do you know if I have to change something in the protocol if I use a different type of PEI (in the lab we have Polyethylenimine, Linear, MW 25000, Polysciences. cat. no. 23966)??