Tween 20 (Polysorbate 20, Polyoxyethylenesorbitan Monolaurate)

Tween-20 is a polysorbate surfactant whose stability and relative non-toxicity allow it to be used as a detergent and emulsifier in a number of domestic, scientific, and pharmacological applications. It is a polyoxyethylene derivative of sorbitan monolaurate, and is distinguished from the other members in the Tween range by the length of the polyoxyethylene chain. The commercial product contains a range of chemical species.||Biological Applications:|Tween 20 has a broad range of applications. For example, it is used: to stabilize purified protein derivative (PPD) solution, used in skin testing for tuberculosis exposure, as a blocking agent in immunologic assays, such as Western blots and ELISA and as a solubilizing agent of membrane proteins for lysing mammalian cells, at a concentration of 0.05 to 0.5%.||CAS No:|9005-64-5||Synonyms:|Polysorbate 20; Polyethylene glycol sorbitan monolaurate||Appearance:|Yellow to amber viscous liquid.||Hydroxyl Number: |96-108||Water (KF): |≤3%||Specific Gravity (25°C):|1.080-1.120||Acid Value:|≤2.2mg KOH/g||Saponification Value:|≤50mg KOH/g||Residual Solvents (1, 4-Dioxane):|≤0.001%||RNase, DNase (1.5% and 3%):|None Detected||Storage and Stability:|Store at RT.