Bucchu absolute, betulina (CAS 68650-46-4) — Green Top to middle Note Fragrance Ingredient
Bucchu absolute, betulina
CAS 68650-46-4
What Is Bucchu absolute, betulina?
Bucchu absolute, derived from the South African buchu plant, is a rare fragrance ingredient encountered in high-end perfumes and niche botanical products. Its distinctive aroma comes from the plant’s leaves, traditionally used for medicinal purposes. This ingredient matters in perfumery for its unique minty-cassis character that adds sophisticated herbal freshness to fragrances. It’s prized for creating distinctive top notes with an immediate aromatic impact.
Safety Profile
USE WITH AWARENESSWhat Does Bucchu absolute, betulina Smell Like?
Bucchu absolute bursts with an intense, almost shocking green freshness – imagine crushing blackcurrant leaves between your fingers with a background of warm mint and eucalyptus. The top note is sharp and herbaceous, evolving into a complex heart where fruity cassis nuances emerge alongside camphoraceous depth. In drydown, it leaves a clean, slightly medicinal trail reminiscent of high-altitude mountain herbs. The overall effect is simultaneously invigorating and sophisticated, with a cooling effect that works beautifully in warm-weather compositions.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used sparingly to create an illusion of dewy magnolia leaves, where bucchu’s green sharpness contrasts with the floral richness.
Provides the startling ‘rain on hot earth’ effect, mimicking the smell of vegetation after rainfall with its wet-green character.
Chemistry, Properties & Perfumer Guide
The Chemistry
Bucchu absolute contains sulfur-containing monoterpenes like pulegone and menthone that contribute to its distinctive aroma. These cyclic monoterpenoids are synthesized by the plant as natural defense compounds. The extract is obtained through solvent extraction of Agathosma betulina leaves, concentrating the volatile compounds while preserving their delicate balance. The sulfur notes are particularly sensitive to oxidation, requiring careful handling during processing.
Physical & Chemical Properties
| Appearance | Dark green viscous liquid |
|---|---|
| Solubility | Soluble in alcohol and oils |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Used sparingly for accent effects |
| Functional Fragrance | 0.05-0.2% | Up to 0.5% | Mouthwash and dental products |
| Aromatherapy | 0.5-1% | Up to 2% | For invigorating blends |
Classic Accords
Tip: Stabilize with antioxidants to prevent sulfurous off-notes from developing over time.
Alternatives & Comparisons
Offers similar cassis notes without the medicinal edge, better for sweeter compositions.
Synthetic alternative providing the cooling minty aspect without green complexity.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. Classified as natural complex substance (NCS).
EU Allergen Declaration
None declared under EU Cosmetics Regulation.
GHS Classification
RIFM Assessment
RIFM has evaluated buchu oil but not the absolute specifically; use with caution pending full assessment.
Sustainability
Buchu plants grow wild in limited regions of South Africa, requiring ethical wildcrafting practices to prevent overharvesting. Some farms now cultivate the plant sustainably. The solvent extraction process is energy-intensive but yields a highly concentrated material. Synthetic alternatives exist but lack the full complexity of the natural extract.
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References
- Van Wyk et al. (2008). Medicinal Plants of South Africa. DOI:10.1016/j.jep.2008.04.022
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 68650-46-4Odor & Flavor
| The oil, steam-distilled from the dried leaves, has a sweet odor with a fresh, bitter taste. Distillation of the imported buchu leaves is carried out in Europe (mainly Holland) and the U.S. (seldom on the growing site).📖 Fenaroli |
Regulatory Status
| IOFI Classification | Natural📖 Fenaroli |
Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
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