Hop CO2 extract (CAS 8007-04-03) — Green Middle Note Fragrance Ingredient
Hop CO2 extract
CAS 8007-04-03
What Is Hop CO2 extract?
Hop CO2 extract is a concentrated form of hops obtained through supercritical carbon dioxide extraction, often encountered in craft beers and botanical perfumery. It matters because it captures the complex, resinous character of hops without the bitterness, offering perfumers a unique green and herbaceous note.
Safety Profile
GENERALLY SAFEWhat Does Hop CO2 extract Smell Like?
Hop CO2 extract opens with an intense, green herbal burst reminiscent of fresh-cut grass and pine needles. The heart reveals a resinous, slightly spicy character with undertones of damp earth and dried hay. Dry-down brings a subtle woody sweetness, like sun-warmed cedar, with lingering traces of black tea and faint citrus.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used for its sharp green freshness to contrast with ambroxan’s warmth, creating a modern fougère effect.
Provides an earthy counterpoint to violet leaf, enhancing the fragrance’s naturalistic lawn-like quality.
Chemistry, Properties & Perfumer Guide
The Chemistry
Hop CO2 extract contains humulone and lupulone acids alongside myrcene and other terpenes. The supercritical CO2 process preserves delicate volatile compounds better than steam distillation. The extract’s composition varies by hop cultivar, with European varieties typically being more floral and American more citrus-pine.
Physical & Chemical Properties
| Appearance | Viscous greenish-brown liquid |
|---|---|
| Solubility | Soluble in alcohol, insoluble in water |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Adds naturalistic green character |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Used in masculine shower gels |
Classic Accords
Tip: Pair with citrus top notes to prevent the green facets from becoming too vegetal.
Alternatives & Comparisons
More intense but with solvent residues; use when a darker profile is desired.
For isolating the fresh terpenic top notes without the resinous base.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No restrictions under current IFRA standards.
EU Allergen Declaration
Contains linalool (trace amounts), requires declaration above 0.001% in leave-on products.
RIFM Assessment
RIFM has evaluated key components; no significant safety concerns at typical usage levels.
Sustainability
CO2 extraction is solvent-free and energy-efficient. Most hops are grown in sustainable agricultural systems in Germany and the Pacific Northwest. Synthetic alternatives exist but lack the full spectrum of natural compounds.
Explore Hop CO2 extract
Browse essential oils and aroma compounds.
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References
- Kishimoto, T. (2008). Hop-Derived Odorants Contributing to the Aroma Characteristics of Beer. J. Agric. Food Chem. DOI: 10.1021/jf800184k
- Steenackers, B. (2015). Chemical transformations of characteristic hop secondary metabolites in relation to beer properties. J. Inst. Brew. DOI: 10.1002/jib.218
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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