In sunscreen formulations, several components act synergistically to provide effective protection to the exposed skin. Alongside the UV filters themselves, emollients are particularly relevant to both effectiveness and consumer acceptance of the product. This is due to their influence on the solubility of solid organic UV filters, dispersibility of inorganic UV filters and skin feel of sunscreen products.
With the specific challenges posed by sunscreen formulation in mind, we will take a closer look at the use of citrate esters as emollients in this context. Citrate esters are clear, odourless, oily liquids and have a long history of safe use as emollients in various personal care products. Jungbunzlauer’s CITROFOL® citrate esters are obtained by acidic esterification of citric acid, which is produced by fermentation of carbohydrate raw materials like corn. Among Jungbunzlauer’s portfolio of citrate esters, Triethyl Citrate (CITROFOL® AI) and Tributyl