Tween 20: Properties and Applications

What is Tween 20?

Tween 20, chemically known as polyoxyethylene sorbitan monolaurate, is a non-ionic surfactant derived from sorbitol and lauric acid. It is commonly used in laboratory and industrial applications to reduce surface tension, stabilise emulsions, and prevent non-specific binding in assays such as ELISA and Western blotting. Its hydrophilic-lipophilic balance (HLB) of approximately 16.7 makes it particularly effective in aqueous environments.

How is Tween 20 used in biotech and pharma?

In biotechnology, Tween 20 is frequently added to buffers and storage solutions to maintain protein stability and prevent adsorption to surfaces. It is also used in cell lysis buffers, antibody conjugation protocols, and enzyme assays. Its ability to solubilise hydrophobic compounds and stabilise biomolecules makes it indispensable in drug formulation and quality control. Regulatory compliance is ensured through batch testing for endotoxins, pH, and microbial contamination, with specifications often aligned with USP, EP, and ISO standards.

What are the safety and regulatory considerations?

Tween 20 is generally regarded as safe (GRAS) by the FDA and is compliant with REACH and GHS guidelines. However, it may interfere with certain assays if present in high concentrations. Its use is documented in SDS and CoA, and it is available in high-purity grades suitable for pharmaceutical and research applications. It is not classified as hazardous under GHS, but handling precautions are advised in large-scale operations.

Related concepts

Commonly used alongside surfactants such as Tween 80, Triton X-100, and CHAPS, Tween 20 is often compared for performance in protein solubilisation and assay interference. It is also referenced in protocols involving HPLC, NMR, and cell culture media.