Tween 20 (Polysorbate 20, Polyoxyethylenesorbitan Monolaurate) [9005-64-5]

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

Acidity (Lauric Acid):
As Reported

Saponification Value:
≤50mg KOH/g

RNase, DNase (1.5% and 3%):
None Detected

Storage and Stability:
Store at RT.