Phenyl Ethyl Isobutyrate, also known as Phenethyl Isobutyrate, is a nature-identical and synthetic ingredient that plays an important role in the fragrance industry. Although it occurs naturally in black tea, mint leaves, beer, rum, and apples, it is produced commercially mainly through the esterification of phenethyl alcohol with isobutyric acid. Its history began in the first half of the 20th century, when chemists were seeking a rose note with a fresher, fruitier facet to expand the olfactory palette available to the industry. In physical form, it is a clear, colorless liquid belonging to the floral family, with a rosy-fruity character.
Description
The scent of Phenyl Ethyl Isobutyrate reveals the sweetness of white rose, intertwined with the freshness of apple, wine, and a faint nuance of black tea. Acting as a top-to-middle note and as a modifying ingredient, it has medium odor strength, fairly good diffusion, and a lasting power of around 24 to 48 hours on a blotter. In fragrance compositions, it helps build rose, peony, freesia, and tea accords, while also adding a juicy quality to the overall scent profile. Perfumers often pair it with Phenethyl Alcohol, Geraniol, Citronellol, Linalool, and Ionone derivatives. As it is an easy-to-handle liquid, it is commonly used either neat or diluted in DPG.
Applications
In terms of applications, this material appears in perfumes, scented candles, leave-on cosmetics, rinse-off products, soap, and even food flavorings. Phenyl Ethyl Isobutyrate is considered very safe and is not subject to strict IFRA toxicity restrictions, allowing flexible use typically at levels of 1% to 5%. Users generally do not need to be concerned about severe allergenic risk, phototoxicity, or mandatory ingredient labeling requirements in Europe, provided the material is stored in tightly sealed packaging in a cool, dry place. Many floral-fruity shower gels and perfumes built around rose or green tea themes have used this ingredient. Its value has also been recognized in Perfume and Flavor Chemicals, where Steffen Arctander described Phenylethyl isobutyrate as having a sweet floral-fruity odor reminiscent of fresh rose, with undertones of tea and wine. He highly appreciated its usefulness in creating peony and freesia accords, as well as its broad versatility in both perfumery and food flavor applications.
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