Crushed lime leaves on a wet chopping board — sharp, aldehydic, green-herbaceous. Not a fruit-forward citrus: the scent lives in the leaf, not the rind. Dominated by (S)-citronellal, which gives it a rosy-lemon sharpness closer to citronella than to bergamot.
Immediate impression: sharp, green, aldehydic — like crushing a lime leaf between the fingers rather than cutting the fruit. The citronellal dominance gives a rosy-lemon overtone absent from expressed lime oil. Greener and more herbaceous than lemongrass, less camphorous than Eucalyptus citriodora, with a wet-leaf freshness that sits somewhere between petitgrain bigarade and citronella. As it evolves, a soft, waxy-floral undertone emerges from the citronellol and linalool fractions — a quiet sweetness beneath the green bite.
Evolution over time
Immediately
Immediately
Sharp aldehydic green-lemon burst. Citronellal dominates — rosy-metallic, almost stinging. Crushed lime leaves, wet herbs, a hint of citronella-like sweetness.
After a few hours
After a few hours
Green intensity softens. Waxy-floral undertone from citronellol and linalool becomes perceptible. Less sharp, more herbaceous-sweet. Faint petitgrain-like dryness.
After a few days
After a few days
Residual soft green-floral trace. Clean, dry, slightly waxy. More tenacious than expressed lime oil but fainter than true petitgrain bigarade residue.
Terroir & Expressions
Indicative 2025 wholesale prices.
The Full Story
Makrut lime (Citrus hystrix) is native to tropical Southeast Asia — Thailand, Indonesia, Malaysia — where it has been cultivated for centuries as a culinary and medicinal plant. In perfumery, the relevant material is the leaf oil, commercially called petitgrain combava (CAS 91771-50-5), obtained by steam distillation of the leaves and twigs. This oil is radically different from the cold-pressed peel oil: the leaf contains 65–85% (S)-citronellal, an aldehyde with a rosy-lemon-green character, while the peel is dominated by beta-pinene (25–35%), sabinene, and limonene — a woodier, more conventional citrus profile.
Chemistry and Distinction
The high citronellal content makes petitgrain combava chemically closer to Eucalyptus citriodora and Java citronella than to other citrus oils. Minor constituents — citronellol (6–10%), linalool (~2%), citronellyl acetate (~2%) — add floral and ester-sweet nuances. A 2017 PMC fractionation study (Warsito et al.) identified over twenty minor components, with limonene conspicuously low (<1%) compared to other Citrus species. This atypical composition — high aldehyde, negligible limonene — makes combava oil unusually stable against oxidation for a citrus material.
Perfumery Applications
In fine fragrance, petitgrain combava functions as a top-note modifier with more tenacity than expressed lime or lemon oils. Its aldehydic-green character lends a dewy, almost metallic freshness to hesperidic openings and pairs effectively with other petitgrain oils, neroli, geranium, and aromatic herbs. The material is used sparingly — TGSC recommends ~1% in fragrance concentrate — because the citronellal content triggers IFRA sensitization thresholds (citronellal, citronellol, and geraniol are all restricted allergens under EU Regulation 2023/1545). Production is centered in Indonesia (Sumatra, Java), Thailand, and Madagascar, with oil yields from leaf distillation typically ranging 0.4–1.5% depending on pre-treatment and method.
This note in Première Peau. Gravitas Capitale · Nuit Elastique · Rose Monotone. Sample all seven extraits in the Discovery Set.
Makrut lime oil contains less than 1% limonene — the molecule that typically dominates citrus oils at 60–95%. This makes it the only widely traded citrus oil where an aldehyde (citronellal) rather than a terpene hydrocarbon is the majority component. The anomaly explains why combava smells more like citronella grass than like lime.
Extraction & Chemistry
Extraction method: Steam distillation of fresh or semi-dried leaves and twigs of Citrus hystrix. The resulting oil — petitgrain combava — is a pale greenish-yellow to yellow liquid, mobile, soluble in alcohol, insoluble in water. Yield varies significantly by method: 0.4–0.5% from fresh leaves by conventional steam distillation, up to 1.5% with microwave pre-treatment of dried leaves (Harahap et al., 2023). Cold-pressed peel oil is a separate product with a fundamentally different composition (beta-pinene/limonene-dominant vs citronellal-dominant). Major producers: Indonesia (Sumatra, Java), Thailand, Madagascar.
Petitgrain combava (the leaf oil of Citrus hystrix) functions as a top-note modifier and citrus amplifier with unusually good tenacity for a hesperidic material, owing to citronellal’s moderate molecular weight (MW 154, bp 207°C) and 16-hour substantivity on blotter. It introduces an aldehydic-green freshness distinct from the limonene-driven brightness of bergamot or lemon — more angular, more herbal, with a rosy translucence. In formulation, combava oil anchors fresh-tonic accords and hesperidic openings. It blends effectively with other petitgrain oils, neroli, geranium, and aromatic herbs such as basil or clary sage. Its low limonene content makes it more photostable than most citrus oils, a practical advantage in fine fragrance. Usage is constrained by IFRA sensitization limits: citronellal, citronellol, and geraniol — all present in the oil — are individually restricted allergens under EU 2023/1545, requiring label declaration above threshold concentrations. TGSC recommends approximately 1% in fragrance concentrate. The material remains niche but valued by perfumers seeking a citrus note that reads green-aldehydic rather than fruity-sweet. Note: the term ‘kaffir lime’ persists in older literature but ‘makrut lime’ is the preferred designation.
