Eucalyptus citriodora oil (CAS 85203-56-1) — Citrus Top Note Fragrance Ingredient
Eucalyptus citriodora oil
CAS 85203-56-1
What Is Eucalyptus citriodora oil?
Eucalyptus citriodora oil, commonly known as lemon eucalyptus oil, is a natural essential oil extracted from the leaves of the Eucalyptus citriodora tree. People encounter it in aromatherapy, insect repellents, and fragrances for its fresh, citrusy aroma. This oil matters because it offers a natural alternative to synthetic insect repellents and adds a bright, uplifting note to perfumes and personal care products.
Safety Profile
USE WITH AWARENESSWhat Does Eucalyptus citriodora oil Smell Like?
Eucalyptus citriodora oil bursts with a vibrant, lemony freshness that is both invigorating and clean. The top note is sharp and citrusy, reminiscent of lemon zest with a hint of herbal undertones. As it evolves, the heart reveals a softer, slightly woody and floral character, balancing the initial brightness. The dry-down is subtle, leaving a faint, refreshing herbal trace. This oil is perfect for adding a natural, uplifting citrus note to fragrances without the sweetness of traditional citrus oils.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
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Adds a refreshing, invigorating citrus-herbal note to this energizing fragrance.
Provides a bright, lemony lift to the green herbal composition.
Used sparingly to add a crisp, clean citrus edge to the fresh floral accord.
Enhances the dark citrus theme with a sharp, herbal lemon note.
Chemistry, Properties & Perfumer Guide
The Chemistry
Eucalyptus citriodora oil is primarily composed of citronellal, which gives it its characteristic lemon-like aroma. This monoterpene aldehyde is naturally occurring in the leaves of the Eucalyptus citriodora tree. The oil is typically extracted through steam distillation, preserving its fresh, citrusy profile. Citronellal is also a key intermediate in the synthesis of other fragrance compounds, such as menthol and citronellol.
Physical & Chemical Properties
| Boiling Point | 198-200 °C |
|---|---|
| Density | 0.860-0.880 g/cm³ |
| Refractive Index | 1.450-1.460 |
| Solubility | Soluble in alcohol, oils; insoluble in water |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | Up to 5% | Adds a fresh, citrusy top note |
| Personal Care | 0.5-2% | Up to 3% | Used in soaps and lotions for its refreshing scent |
| Aromatherapy | 2-5% | Up to 10% | Valued for its uplifting and invigorating properties |
| Insect Repellents | 5-10% | Up to 20% | Natural alternative to synthetic repellents |
Classic Accords
Tip: Use in small amounts to avoid overpowering other citrus notes in the composition.
Alternatives & Comparisons
Similar citrus-herbal profile but with a stronger, more pungent aroma, often used in insect repellents.
Offers a brighter, more intense lemon note, suitable for fresh, citrusy fragrances.
Pure citrus note without the herbal undertones, ideal for simpler citrus accords.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No restrictions under IFRA standards.
EU Allergen Declaration
Citronellal is listed as an EU allergen; must be declared above 0.001% in leave-on products and 0.01% in rinse-off products.
GHS Classification
RIFM Assessment
RIFM has assessed citronellal as safe for use in fragrances at current levels.
Sustainability
Eucalyptus citriodora oil is sustainably harvested from cultivated trees, primarily in Australia and China. The steam distillation process is energy-intensive but yields a natural product with minimal environmental impact. Synthetic alternatives exist but lack the complexity and natural appeal of the essential oil.
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References
- PubChem. Eucalyptus citriodora oil. PubChem
- IFRA Standards. Citronellal. IFRA
- RIFM. Safety assessment of citronellal. RIFM
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 85203-56-1Physical 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.
