Terpenes and terpenoids, turpentine-oil residues (CAS 68938-00-1) — Citrus Top to Base Note Fragrance Ingredient
Terpenes and terpenoids, turpentine-oil residues
CAS 68938-00-1
What Is Terpenes and terpenoids, turpentine-oil residues?
Terpenes and terpenoids are organic compounds found in many plants, responsible for their distinct aromas. They are commonly encountered in pine trees, citrus fruits, and herbs like rosemary and lavender. These compounds are what give essential oils their characteristic scents. Terpenes matter because they form the backbone of many natural fragrances and are widely used in perfumery, aromatherapy, and flavoring. Their versatility and natural origin make them popular in both synthetic and natural fragrance formulations.
Safety Profile
USE WITH AWARENESSWhat Does Terpenes and terpenoids, turpentine-oil residues Smell Like?
Terpenes and terpenoids offer a wide range of olfactory profiles, from the fresh, crisp scent of pinene found in pine trees to the sweet, citrusy aroma of limonene in oranges. These compounds can evolve from sharp, green top notes to warmer, woody or balsamic base notes. Their dry-down often leaves a clean, resinous trail, reminiscent of a walk through a coniferous forest or a citrus grove. The diversity in their scent profiles makes them indispensable in creating natural, vibrant accords.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Uses terpenes to evoke the scent of ambergris and sea air, creating a fresh, woody, and slightly salty aroma.
A classic fougère that highlights terpenes from pine and lavender for a fresh, forest-like fragrance.
Chemistry, Properties & Perfumer Guide
The Chemistry
Terpenes are hydrocarbons synthesized from isoprene units (C5H8), while terpenoids are modified terpenes with additional functional groups. They are classified based on the number of isoprene units: monoterpenes (C10), sesquiterpenes (C15), etc. These compounds are produced by many plants as secondary metabolites, often for defense or attraction. Synthetic terpenes are typically derived from petrochemical sources or through biotechnological methods, offering consistency and scalability.
Physical & Chemical Properties
| Boiling Point | Varies widely by compound |
|---|---|
| Density | Varies widely by compound |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-10% | Up to 20% | Versatile for creating natural accords |
| Household Products | 0.5-5% | Up to 10% | Adds fresh, clean scents |
Classic Accords
Tip: Balance terpenes with fixatives to prevent rapid evaporation and ensure longevity.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific restrictions, but individual terpenes may be subject to IFRA guidelines.
EU Allergen Declaration
Some terpenes like limonene are listed as potential allergens and require declaration.
GHS Classification
RIFM Assessment
RIFM assesses terpenes individually; many are considered safe at typical usage levels.
Sustainability
Terpenes can be sourced sustainably from renewable plant materials or synthesized with lower environmental impact. Biotechnological production is emerging as a greener alternative to traditional extraction methods.
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References
- PubChem. Terpenes. PubChem
- Bauer, K. et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH. Wiley
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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