What is Polysorbate 60?
Polysorbate 60 (also known as Tween 60) is a noniionic surfactant and emulsifier with the CAS number 9005-67-8. It is synthesized by combining sorbitol (a sugar alcohol) with oleic acid (a fatty acid derived from vegetable oils), followed by ethoxylation. The result is a pale yellow to amber oily liquid that is soluble in water and organic solvents. This dual solubility makes it particularly useful as an emulsifying agent in formulations where oil and water phases need to be combined and stabilized.
Common Uses
Polysorbate 60 is widely used across multiple industries. In food manufacturing, it appears as an emulsifier in baked goods, cakes, icings, whipped toppings, and salad dressings. It helps create smooth textures and prevents ingredient separation. Beyond food, it is used in cosmetics, pharmaceuticals, and as a boiler water additive in industrial applications. The additive also functions as a flavor adjuvant and surface-active agent, enhancing product stability and consistency. In some regions, it is approved for use in foods at specified concentration limits.
Safety Assessment
Polysorbate 60 has been evaluated by regulatory agencies worldwide. The FDA's adverse event database contains zero reported adverse events associated with this additive, and there are no FDA recalls linked to polysorbate 60. The European Food Safety Authority (EFSA) has also reviewed polysorbate 60 and similar polysorbates. According to EFSA assessments, polysorbates are generally recognized as safe at their typical usage levels in food applications.
Toxicological studies have examined polysorbate 60's safety profile. Acute toxicity studies in animals show low toxicity, with LD50 values typically in the range of 9,000-10,000 mg/kg in rats when administered orally. Repeated dose studies have not identified significant organ toxicity at relevant exposure levels. Genotoxicity and reproductive toxicity studies have not raised safety concerns for this substance.
Allergic reactions to polysorbate 60 are rare but have been documented in medical literature, primarily in pharmaceutical contexts. Individuals with sensitivities to sorbitan esters or oleic acid derivatives should be cautious, though such reactions remain uncommon in the general population.
Regulatory Status
Polysorbate 60 is not currently on the FDA's Generally Recognized as Safe (GRAS) list, which means it operates under FDA regulations as a food additive rather than as a GRAS substance. However, this classification does not indicate a safety concern; rather, it reflects the regulatory pathway under which it is approved. It is permitted as a food additive in the United States under specific regulatory conditions and concentration limits established by the FDA.
In the European Union, polysorbate 60 is approved as food additive E435. It is also approved in Canada, Australia, Japan, and other countries at regulated concentration levels. Different jurisdictions may specify different maximum use levels based on their regulatory frameworks.
Key Studies
Scientific literature on polysorbate 60 primarily addresses its functional properties and formulation chemistry rather than safety concerns. Studies in food science journals document its effectiveness as an emulsifier in various food matrices. Cosmetic and pharmaceutical research has extensively characterized its stability and performance profiles. Toxicological reference data from standard safety testing conducted according to OECD guidelines supports its continued regulatory approval at permitted use levels.