Flavor ingredient regulatory record
1,3,5-Undecatriene
1,3,5-Undecatriene is an alkene in the fruity family, FEMA GRAS under FEMA number 3795 (CAS 16356-11-9). Its odor is green, fruity, floral, herbaceous.
- FEMA
- 3795
- CAS
- 16356-11-9
- JECFA
- 1341
- EU FL
- 01.061
- Formula
- C11H18
- EC
- 240-416-1
GRAS status: FEMA GRAS, publication 16. Recorded by FDA in the Substances Added to Food inventory under CAS 16356-11-9.
Structure
Identity
Also known as: undeca-1,3,5-triene, n-undecatriene.
Can 1,3,5-Undecatriene be labeled natural?
The process decides for 1,3,5-Undecatriene. It occurs in nature, so a natural-source, natural-process material is natural flavor in the US and synthetic 1,3,5-Undecatriene is artificial. 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
1,3,5-Undecatriene is FEMA GRAS under FEMA number 3795. It is cited in the Code of Federal Regulations at 21 CFR 172.515.
European Union and United Kingdom
Listed on the Union List of flavouring substances as FL 01.061, Annex I Part A under Regulation (EC) 1334/2008, evaluation status approved (EFSA). The UK retains the same list.
Purity. At least 94% (sum of cis/trans isomers); secondary component 2,4,6-undecatriene (Z,Z,E)
JECFA (WHO / FAO)
JECFA number 1341, evaluated at the 63rd meeting in 2004. no safety concern at current levels of intake.
Other US flags
Not on the California Proposition 65 list.
TSCA Inventory status
A flavor ingredient is also an industrial chemical. 1,3,5-Undecatriene appears on the EPA Toxic Substances Control Act Chemical Substance Inventory under CAS 16356-11-9, where EPA names it 1,3,5-Undecatriene.
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: Green, fruity, floral, herbaceous.
Where it is used
1,3,5-Undecatriene is used in beverage, fruit flavors, confection and flavoring agents, typically as a fruity note.
Structurally similar flavor ingredients
Flavor ingredients with a GRAS determination closest to 1,3,5-Undecatriene by structure. Whether one can replace it is a sensory and regulatory call; the reformulation tool works that through.
| Material | FEMA | Similarity | Occurrence |
|---|---|---|---|
| 1,3,5,7-Undecatetraene | 4652 | 98% | In nature |
| 1-Nonene | 4651 | 90% | In nature |
| 2,4,7-Decatrienal | 4089 | 87% | In nature |
| cis-6-Nonenal | 3580 | 85% | In nature |
| cis-3-Octen-1-ol | 3467 | 85% | In nature |
More alkenes in this index
cis- and trans-1-Methoxy-1-decene · 2,4-Nonadiene · 1,3,5,7-Undecatetraene · p,alpha-Dimethylstyrene · 4-Methyl-cis-2-pentene · 1-Nonene
1,3,5-Undecatriene FAQ
Is 1,3,5-Undecatriene FEMA GRAS?
Yes. The FEMA Expert Panel lists 1,3,5-Undecatriene as GRAS under FEMA number 3795. The Code of Federal Regulations lists it at 21 CFR 172.515.
What are the FEMA and CAS numbers for 1,3,5-Undecatriene?
1,3,5-Undecatriene is FEMA 3795, CAS 16356-11-9. Its flavor category is fruity.
How is 1,3,5-Undecatriene described, and where does it show up?
Flavorists describe 1,3,5-Undecatriene as green, fruity, floral, herbaceous. It is used in beverage, fruit flavors, confection and flavoring agents.
What did JECFA conclude about 1,3,5-Undecatriene?
JECFA evaluated 1,3,5-Undecatriene at the 63rd meeting in 2004 under JECFA number 1341. The panel concluded: no safety concern at current levels of intake.
Is 1,3,5-Undecatriene on the EU Union List?
Yes. FL 01.061 is the Union List entry for 1,3,5-Undecatriene, annex I Part A, under Regulation 1334/2008, and the UK keeps the same list.
Does 1,3,5-Undecatriene count as natural in the US and the EU?
Nature makes 1,3,5-Undecatriene, which is why the US label turns on process. A natural route gives natural flavor; synthesis gives artificial 1,3,5-Undecatriene, same molecule. 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.
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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 1,3,5-UNDECATRIENE under CAS 16356-11-9 and carries its FEMA number, its JECFA flavor number. 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.