TWEEN® 80 is a polysorbate surfactant which helps in stabilizing proteins and in protein membrane studies. It is regularly used for the extraction of membrane proteins and isolation of nuclei from cells.||Synonyms:|POE (20) sorbitan monooleate; Polyethylene glycol sorbitan monooleate; Polyoxyethylenesorbitan monooleate; Polysorbate 80||CAS No:|9005-65-6||Molecular Weight:|1309.68||Appearance:|Yellow-golden yellow, viscous liquid||Hydroxyl Number:|65-80 KOH/g||Specific Gravity:|1.06-1.09||Refractive Index:|1.472||Water (KF):|≤3%||Viscosity:|300-500cS||Polyoxyethylene:|65-70%||Saponification Value:|45-55||1,4 Dioxane:|≤0.0001%||Heavy Metals:|≤0.001% ||Residue on Ignition:|≤0.25%||RNase, DNase, Protease:|None Detected||Storage and Stability:|Store at RT. Stable for 12 months after receipt.