Пекан

Pecan (Carya illinoinensis, Juglandaceae) is the nut of a tall, long-lived deciduous tree native to the southern United States and northern Mexico. The same family contains walnut (Juglans regia) and hickory (Carya ovata). Pecan is the only commercial tree-nut endemic to North America.

In perfumery, pecan is a reconstruction, not an extraction. The cold-pressed nut oil — sold as a cosmetic carrier oil — is high in oleic and linoleic acids and used in skincare for emollient properties, but it carries almost no aromatic content [A]. The smell that perfumers and customers recognise as 'pecan' is the smell of pecan roasted: Maillard reaction products, pyrazines, furans, lactones, the soft caramel of toasted sugar.

Botany and history

The species was domesticated comparatively recently — Indigenous peoples across the Mississippi Valley harvested wild pecans for at least 8,000 years, but commercial cultivation began only in the 1880s in Louisiana, when Antoine, an enslaved gardener at the Oak Alley plantation, successfully grafted improved varieties. Modern commercial production centres on Texas, Georgia and New Mexico in the USA, with smaller industries in Mexico, South Africa and Australia.

The reconstruction

A perfumery pecan accord is built from synthetic blocks. Pyrazines (2,5-dimethylpyrazine, 2-ethyl-3,5-dimethylpyrazine) carry the roasted-nutty signature [B] — the same compounds that flavour roasted coffee, peanuts and cocoa nibs. γ-Decalactone (CAS 706-14-9) supplies creamy fatty body. Ethyl maltol (CAS 4940-11-8) softens the whole into sugar-warmth. Sandalwood, tonka bean and a trace of vanillin often sit underneath. The accord is gourmand-base, slightly buttery, distinguishable from walnut (drier) and hazelnut (sharper).

Sources & Notes

[A] PubChem CIDs for pecan oil fatty acids: 445639 (oleic acid CAS 112-80-1), 5280450 (linoleic acid CAS 60-33-3). Pecan oil composition data — see Wakeling et al., 'Chemical Composition of Pecan,' J. Food Sci.

[B] PubChem CID 31252 — 2,5-dimethylpyrazine, CAS 123-32-0. The principal roasted-nutty Maillard pyrazine. pubchem.ncbi.nlm.nih.gov/compound/31252.