Geranyl Acetate

Aroma and sensory profile

Geranyl acetate is geraniol with the sweetness lifted and the wax left in. Fragrance references type it floral with medium strength and describe it neat as floral, rose, lavender, green, and waxy, or at 5 percent as floral, rosy, waxy, herbal, and green with a slight cooling nuance; its flavor at 1 part per million is waxy, green, floral, oily, and soapy with citrus and winey, rum nuances [1]. Where geraniol is a full rose, geranyl acetate is the rose's leaf and a ripe pear beside it, fresher, greener, and less sweet.

The molecule is the acetate ester of geraniol, (E)-3,7-dimethylocta-2,6-dienyl acetate, with no stereocenter, so there are no enantiomers to compare. Its geometric isomer, neryl acetate, the ester of nerol, accompanies it at 1 to 2 percent in commercial material [1] and carries a sweeter, more bergamot-like character. In the plant, geranyl acetate and geraniol interconvert: an esterase in lemongrass controls how much free geraniol the oil holds [11], which is why palmarosa and lemongrass oils shift in character with harvest time and storage.

Effects and research

No human trial of geranyl acetate was found. The Research Institute for Fragrance Materials assessed it in 2024, setting a sensitization induction level, finding no phototoxic concern, and finding no genotoxicity [3]. The largest study of it is a toxicology bioassay rather than a pharmacology paper.

The National Toxicology Program gave food-grade geranyl acetate, a 71:29 mixture with citronellyl acetate, by gavage to rats at 1,000 and 2,000 milligrams per kilogram and to mice at 500 and 1,000 milligrams per kilogram, five days a week for 103 weeks, and concluded that it was not carcinogenic for rats and that no evidence of any carcinogenic effect was found in mice, though reduced survival at the high doses limited the study's sensitivity [4]. A 2023 acute study in mice put the oral LD50 of a geranyl acetate composite above 2,000 milligrams per kilogram with no signs of toxicity over 15 days [6].

The pharmacology is modest. In mice, geranyl acetate at 200 milligrams per kilogram showed antinociceptive activity in writhing and formalin tests, significant only at high doses and weaker than p-cymene tested alongside it [7]. In rats, oral doses of 25 to 100 milligrams per kilogram for seven days were diuretic and increased uric acid excretion comparably to allopurinol, with xanthine oxidase inhibition in vitro [5]. In human keratinocytes it was the most protective of 14 plant metabolites against the hair-dye allergen para-phenylenediamine, suppressing p53 and MAPK phosphorylation and five inflammatory cytokines [8]. All are model results.

Natural sources

Geranyl acetate is an ester of the geraniol plants. HSDB records it as a component of essential oils in varying amounts, up to 60 percent in oils from Callitris and Eucalyptus species and up to 14 percent in palmarosa oil, with smaller amounts in geranium, citronella, petitgrain, and lavender oils [2]. Lemongrass carries it in balance with geraniol under esterase control [11], and the same balance shifts through the development of palmarosa. Fragrance references note that commercial material is often obtained from palmarosa and carries 1 to 2 percent neryl acetate [1]. Coriander seed, carrot seed, and neroli carry it at low levels, and it is the acetate half of the geraniol-rich chemotypes of thyme and basil. In cannabis geranyl acetate is a trace terpenoid, occasionally reported in floral chemotypes and more often absent.

Boiling point and vaporization

PubChem compiles geranyl acetate's boiling point as 240 to 245 °C from the Joint FAO/WHO Expert Committee on Food Additives, about 242 °C with decomposition from the Merck Index, and 468 °F at 760 mmHg from the National Toxicology Program [2]; fragrance references list 240 to 245 °C at 760 mmHg and 127 to 129 °C at 22 mmHg [1]. This profile keeps 245 °C (473 °F), the top of the JECFA range, which matches what the site already listed. That places it above geraniol and citronellol in the heart-to-base band; it decomposes near its boiling point, so it is distilled under vacuum. Its instability is oxidative: thermal oxidation converts it to epoxides and photo-oxidation to hydroperoxides [9]. No culinary thermal degradation study was found.

Safety and regulation

Geranyl acetate is generally recognized as safe as a synthetic flavoring substance at 21 CFR 182.60, as "Geranyl acetate (geraniol acetate)" [10]. The two-year National Toxicology Program bioassay found it not carcinogenic in rats or mice [4], and the Research Institute for Fragrance Materials found it not genotoxic and not phototoxic in 2024 [3]. No cancer classification applies.

Its skin record is that of a moderate sensitizer. Under Europe's classification inventory, 78 percent of notifications flag it as a possible skin sensitizer, 80 percent as a skin irritant, and 77 percent as harmful to aquatic life with long-lasting effects [2]. The chemistry is geraniol's: the ester itself is a weak sensitizer, and the hydroperoxides it forms on air and light exposure are stronger ones [9]. Fresh palmarosa or lavender oil on skin is a small risk; an aged one is not.

Industries and uses

Fragrance: geranyl acetate is a foundation fresh-floral material in rose, lavender, and green accords and one of the highest-volume fragrance esters, made from geraniol or isolated from palmarosa [1][2]. Culinary: it holds GRAS flavoring status and contributes green, waxy, pear-like floral nuances at parts-per-million levels; it is a natural constituent of lemongrass and coriander flavor [1][10][11]. Aromatherapy: palmarosa, lavender, and lemongrass oils are its carriers; the sensitization data are the relevant caution for topical use of aged oils [2][9]. Cosmetics: it is used across fragranced personal-care products, with the irritation and sensitization classifications that formulators track [2][3].