Flavor ingredient regulatory record
6,10-Dimethyl-5,9-undecadien-2-one
6,10-Dimethyl-5,9-undecadien-2-one is a ketone in the fruity family, FEMA GRAS under FEMA number 3542 (CAS 689-67-8). Its odor is sweet, fruity, floral, tropical, ripe.
- FEMA
- 3542
- CAS
- 689-67-8
- JECFA
- 1122
- Formula
- C13H22O
- EC
- 211-711-2
GRAS status: FEMA GRAS, publication 11. Recorded by FDA in the Substances Added to Food inventory under CAS 3796-70-1.
Structure
Identity
Also known as: 5,9-Undecadien-2-one, 6,10-dimethyl-, 5,9-Hendecadien-2-one, 6,10-dimethyl-, 2,6-Dimethylundeca-2,6-dien-10-one, Dihydropseudoionone, 6,10-Dimethyl-5,9-undecadiene-2-one, NSC 406679, 6,10-Dimethyl-5,9-undec-2-one, geranylacetone, geranyl acetone, (5e)-6,10-dimethylundeca-5,9-dien-2-one, trans-geranylacetone, dihydropseudoionone.
Can 6,10-Dimethyl-5,9-undecadien-2-one be labeled natural?
Since 6,10-Dimethyl-5,9-undecadien-2-one is found in nature, US labeling follows how it was obtained: natural flavor from a natural source and a natural process, artificial when 6,10-Dimethyl-5,9-undecadien-2-one is synthesized. The EU and UK grant the natural claim only to that natural route; Mercosur and Mexico call synthetic material identical-to-natural.
- United States
- Natural or artificial, by process
- European Union and UK
- Natural only from natural material
- Mercosur and Mexico
- Natural or identical-to-natural
How each market defines the classes: natural vs artificial flavor under 21 CFR 101.22.
Regulatory status, with citations
United States
6,10-Dimethyl-5,9-undecadien-2-one is FEMA GRAS under FEMA number 3542. It is cited in the Code of Federal Regulations at 21 CFR 172.515.
European Union and United Kingdom
No EU FL number is on file for 6,10-Dimethyl-5,9-undecadien-2-one. That is not a finding either way. The Union List covers defined flavouring substances, so natural complex materials are handled as flavouring preparations under Parts B to F and never receive a number, and substances used as additives sit under Regulation 1333/2008 instead. Confirm the position before EU or UK use.
JECFA (WHO / FAO)
JECFA number 1122, evaluated at the 59th meeting in 2002. No safety concern at current levels of intake when used as a flavouring agent.
Other US flags
Not on the California Proposition 65 list.
TSCA Inventory status
A flavor ingredient is also an industrial chemical. 6,10-Dimethyl-5,9-undecadien-2-one appears on the EPA Toxic Substances Control Act Chemical Substance Inventory under CAS 689-67-8, where EPA names it 5,9-Undecadien-2-one, 6,10-dimethyl-.
Active in US commerce
EPA designates this substance active, so no Notice of Activity Form B is required before manufacturing. What active and inactive mean.
EPA publishes no regulatory flags on this listing. What the flags mean.
From the EPA non-confidential TSCA Inventory, July 2026 release. EPA also maintains a confidential portion it does not publish. Search the Inventory by CAS number.
Odor and taste
Odor: Sweet, fruity, floral, tropical, ripe.
Where it is used
6,10-Dimethyl-5,9-undecadien-2-one is used in beverage, confection, fruit flavors, bakery and dairy, typically as a fruity note.
Structurally similar flavor ingredients
Flavor ingredients with a GRAS determination closest to 6,10-Dimethyl-5,9-undecadien-2-one by structure. Whether one can replace it is a sensory and regulatory call; the reformulation tool works that through.
| Material | FEMA | Similarity | Occurrence |
|---|---|---|---|
| Geranyl acetate | 2509 | 91% | In nature |
| Pseudoionone | 4299 | 70% | In nature |
More ketones in this index
Acetoin · Methyl beta-naphthyl ketone · Isophorone · 2,3,3-Trimethylindan-1-one · 2,3-Octanedione · 5-Methyl-5-hexen-2-one
6,10-Dimethyl-5,9-undecadien-2-one FAQ
Is 6,10-Dimethyl-5,9-undecadien-2-one on the FEMA GRAS list?
It is. FEMA number 3542 covers 6,10-Dimethyl-5,9-undecadien-2-one. It is also codified at 21 CFR 172.515.
What is the FEMA number for 6,10-Dimethyl-5,9-undecadien-2-one?
The FEMA number for 6,10-Dimethyl-5,9-undecadien-2-one is 3542 and its CAS registry number is 689-67-8. FEMA files it in the fruity flavor category.
Is 6,10-Dimethyl-5,9-undecadien-2-one natural or artificial?
6,10-Dimethyl-5,9-undecadien-2-one occurs in nature, so the label depends on the route: 6,10-Dimethyl-5,9-undecadien-2-one won from a natural source by a physical, enzymatic or microbiological process is natural flavor in the United States, and synthesized 6,10-Dimethyl-5,9-undecadien-2-one is artificial. In the EU and UK the natural claim likewise needs the natural route, while Mercosur and Mexico keep a third class, identical-to-natural, for the synthetic material.
Is 6,10-Dimethyl-5,9-undecadien-2-one approved in the EU?
No EU FL number is on file for 6,10-Dimethyl-5,9-undecadien-2-one. It has a JECFA evaluation (JECFA 1122), which the EU list draws on, but the Union List entry itself should be confirmed before EU use.
Has JECFA evaluated 6,10-Dimethyl-5,9-undecadien-2-one?
Yes. JECFA number 1122, evaluated at the 59th meeting in 2002. Conclusion: No safety concern at current levels of intake when used as a flavouring agent.
What is 6,10-Dimethyl-5,9-undecadien-2-one used for?
6,10-Dimethyl-5,9-undecadien-2-one is described as sweet, fruity, floral, tropical, ripe. It shows up in beverage, confection, fruit flavors, bakery and dairy.
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Sources and attribution. The identity and regulatory facts on this page are taken from the FDA Substances Added to Food inventory, a US government record, which lists this substance as GERANYL ACETONE under CAS 3796-70-1 and carries its FEMA number, its JECFA flavor number and its 21 CFR citations. The inventory is searchable at FDA. FDA records its technical effect as flavoring agent or adjuvant.
A FEMA GRAS conclusion is reached by the Expert Panel of the Flavor and Extract Manufacturers Association of the United States, and the FEMA number names that conclusion. FEMA publishes its own entry for this substance in the FEMA Flavor Library, which is the authoritative record of what the Panel decided and is worth reading alongside this page.
Ambrose Compliance is not affiliated with, endorsed by, or sponsored by FEMA. FEMA and FEMA GRAS are used here as identifiers for a published regulatory determination, not as marks of any relationship between FEMA and Ambrose.
About this page. Facts come from the FDA Substances Added to Food inventory, the Code of Federal Regulations, the EPA TSCA Inventory, the EU Union List, JECFA and the Ambrose database, with FEMA's published determination cited where it applies; parts of the text are written by Ambrose AI, which can make mistakes. Check the cited source before relying on anything here. This is not regulatory or legal advice.