Terpenes and Terpenoids, limonene fraction (CAS 65996-98-7) — Citrus Top Note Fragrance Ingredient
Terpenes and Terpenoids, limonene fraction
CAS 65996-98-7
What Is Terpenes and Terpenoids, limonene fraction?
Terpenes and terpenoids, particularly the limonene fraction, are natural compounds found in citrus peels and many essential oils. They give fresh, zesty aromas to cleaning products, perfumes, and even foods. These molecules are the backbone of many natural fragrances, contributing brightness and lift. Their versatility makes them essential in creating everything from invigorating colognes to household cleaners with a fresh scent.
Safety Profile
USE WITH AWARENESSWhat Does Terpenes and Terpenoids, limonene fraction Smell Like?
The limonene fraction bursts with vibrant, sunlit citrus—think freshly peeled oranges with a hint of green rind bitterness. It evolves from a sharp, almost effervescent top note to a softer, slightly herbal heart. The dry-down retains a whisper of citrus peel, clean and uplifting without becoming cloying. Like a Mediterranean grove in summer, it balances juicy sweetness with crisp, green undertones.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Limonene’s citrus sparkle amplifies the bergamot in this classic, creating a bracing freshness that defines the cologne genre. Its volatility ensures an immediate burst of energy.
Used here to enhance the Sicilian lemon top note, adding realism and diffusion. The terpenic quality bridges citrus to woody base notes.
Chemistry, Properties & Perfumer Guide
The Chemistry
Terpenes like limonene are hydrocarbons built from isoprene units (C5H8), typically forming cyclic or acyclic structures. The limonene fraction contains both d-limonene (orange-like) and l-limonene (piney), with chirality affecting odor profiles. Industrially produced via citrus waste distillation or synthetic routes like acid-catalyzed cyclization of myrcene. Oxygenated derivatives (terpenoids) include alcohols (linalool) and aldehydes (citral), expanding olfactory versatility.
Physical & Chemical Properties
| Boiling Point Range | 175-177 °C (limonene) |
|---|---|
| Vapor Pressure | 1.4 mmHg at 25°C |
| Solubility | Insoluble in water, miscible with oils |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 2-5% | Up to 10% | Citrus accent in top notes |
| Household Cleaners | 1-3% | 0.5-5% | Provides fresh scent and degreasing properties |
Classic Accords
Tip: Stabilize in ethanol to prevent oxidation, which can create skin-sensitizing peroxides.
Alternatives & Comparisons
More lemon-like but stronger; use when higher tenacity and aldehyde character are needed. Less prone to oxidation issues.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific restrictions, but oxidation products are monitored under IFRA 49th Amendment.
EU Allergen Declaration
Limonene must be declared when concentration exceeds 0.001% in leave-on products (EU Regulation 1223/2009).
GHS Classification
RIFM Assessment
RIFM considers limonene safe at current use levels but recommends antioxidant stabilization.
Sustainability
Synthetic production reduces pressure on citrus agriculture, though bioengineered yeast routes show promise. Recycling citrus industry byproducts (peels) remains the most eco-friendly source. Biodegradability is excellent (OECD 301B).
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References
- IFRA Standards (49th Amendment). Limonene Safety Assessment. IFRA
- PubChem Compound Summary: Limonene CID 22311
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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