Tart, sparkling, faintly sulfurous. Grapefruit smells like sunrise on a terrace — a bright citrus burst with a bitter edge, a juicy sweetness, and an almost metallic tang that no other citrus possesses.
More bitter than orange, less acid than lemon, with a sulfurous-metallic undertone that neither possess. Grapefruit opens with explosive citrus brightness — d-limonene's clean, universally recognizable sparkle — then immediately reveals the nootkatone signature: a bitter, slightly woody, almost grapefruit-rind quality that is drier and more persistent than any other citrus. There is a faint thiol note (mercaptan compounds at trace levels) that adds a sulfurous, almost tropical edge. On blotter, the limonene-dominant top vanishes in under an hour, but nootkatone, being a sesquiterpene, persists noticeably longer than typical citrus notes.
The limonene evaporates. Nootkatone persists slightly longer as a bitter-woody trace — drier and more tenacious than typical citrus
After a few days
After a few days
Mostly gone. Citrus oils are among the most volatile materials in perfumery, though nootkatone's sesquiterpene weight leaves a faint, dry trace
Terroir & Expressions
Indicative 2025 wholesale prices.
The Full Story
Grapefruit (Citrus × paradisi) is a hybrid of pomelo (Citrus maxima) and sweet orange (C. sinensis), thought to have originated in Barbados in the seventeenth or eighteenth century. The cold-pressed peel oil (CAS 8016-20-4) is the standard perfumery natural; it is limonene-dominant like all citrus, but two minor compounds make grapefruit immediately recognisable.
Nootkatone (CAS 4674-50-4, a sesquiterpene ketone, C₁₅H₂₂O) is the woody-bitter heart of grapefruit [A] — it carries the characteristic grapefruit angle from limonene's plain citrus. Even more important at trace level is 1-p-menthene-8-thiol (CAS 71159-90-5), the powerful sulphur thiol that supplies the metallic-fresh juicy quality, identifiable below ~10 ppb in finished fragrance [B]. Together these two compounds — both at trace levels — turn an otherwise ordinary citrus oil into something only grapefruit smells like.
[B] PubChem CID 521348 — 1-p-menthene-8-thiol (grapefruit mercaptan), CAS 71159-90-5. The trace sulphur thiol responsible for grapefruit's metallic juiciness. pubchem.ncbi.nlm.nih.gov/compound/521348.
Did You Know?
Did you know?
Nootkatone — the molecule that gives grapefruit its identity — was named after Nootka Sound in British Columbia, where it was first isolated from the heartwood of Alaska yellow cedar (Callitropsis nootkatensis), not from grapefruit. The same molecule also functions as an effective insect repellent, and the US EPA registered it in 2020 as a biopesticide against ticks and mosquitoes.
Extraction & Chemistry
Extraction method: Cold pressing of Citrus x paradisi peel. The oil is 90-95% d-limonene with 0.01-0.8% nootkatone — the sesquiterpene ketone responsible for the characteristic grapefruit identity. Cold-pressed oil contains phototoxic furocoumarins (IFRA-restricted in leave-on products). Distilled grapefruit oil is furocoumarin-free but lacks some peel-fresh character. Nootkatone can be used as an isolate to deliver grapefruit character without phototoxicity restrictions.
Restricted (expressed) — phototoxic when expressed; IFRA limits in leave-on products
Synonyms
pamplemousse, pomelo hybrid
Physical Properties
Odor Strength
Medium
Appearance
pale yellow to yellow clear liquid
Boiling Point
171.00 °C. @ 760.00 mm Hg
Flash Point
112.00 °F. TCC ( 44.44 °C. )
Specific Gravity
0.86300 to 0.97000 @ 25.00 °C.
Refractive Index
1.47800 to 1.54000 @ 20.00 °C.
In Perfumery
Grapefruit functions as a top note with slightly longer tenacity than most citrus materials, thanks to nootkatone's sesquiterpene weight. It provides a bright, bitter-fresh opening for cologne, hesperidic, fresh-spicy, and green-citrus compositions. The bitterness distinguishes it from sweeter citrus notes (orange, mandarin) and makes it a natural partner for green tea, vetiver, pepper, and woody-mineral bases. Grapefruit is prominent in the modern cologne genre, where its clean tartness creates a unisex freshness.
