has role vaccine component vaccine emulsifier WEB: http://www.ncbi.nlm.nih.gov/pubmed/16337664 Oliver He Asiyah Yu Lin vaccine component Emulsifiers help bind ingredients together and keep them from separating, most commonly with oil and water. An emulsifier is also a surfactant that reduces the surface tension of a liquid and results in an easier, smoother spread. Reference: http://www.wisegeek.org/what-is-polysorbate-80.htm a vaccine additive that stabilizes the vaccine emulsification manufacturing process and makes emulsion of the vaccine easier. vaccine additive vaccine emulsifier role