undecadien-2-one

Found in 2 ingredients across the CompKitchen flavor graph.

Look up another compound — search by name, CAS number, PubChem CID, or FEMA #.

Properties

Odor description: fatty, green, fruity
Odor threshold — orthonasal, in clean water: 0.440 ppb – 6.0 ppb median 3.2 ppb · 2 published values · see all 15 with sources
CAS number: 91-20-3

Regulatory · United States

FEMA GRAS — Generally Recognized As Safe for flavoring use

? Partial match

FEMA number: 4746
GRAS publication: GRAS 26
FEMA primary name: 3,5-undecadien-2-one

Reported use levels (ppm by food category)

Typical vs maximum reported addition levels in finished food. Use as a regulatory ceiling reference — verify against the current GRAS publication for your product category.

Food category	Typical (ppm)	Maximum (ppm)
beverages, nonalcoholic	1	10
chewing gum	10	30
confections and frostings	1	10
fats and oils	1	10
fruit ices	1	10
gelatins and puddings	1	10
gravies	1	10
hard candy	5	20
jams and jellies	1	10
seasonings and flavors	1	10
snack foods	5	25
soft candy	1	10
soups	1	10
sweet sauces	1	10

Source: FEMA GRAS publications 1-33. 1 related FEMA record for this name — verify the exact substance for regulatory use.

How this molecule is described

Sources disagree about odour more often than they disagree about chemistry. Rather than show one answer, here is every description on file with how many ingredient records carry it.

Descriptions on file

Ordered by how many independent descriptor streams give each wording, then by how often it appears. The bar is still replication — one source copied onto many ingredients scores high there — so the two can disagree.

sulfurous FlavorDB 2.0, Flavordb Odor Column 2 sources agree

chemical FlavorDB 2.0, Flavordb Odor Column 2 sources agree

fatty, green, fruity shown above Llm Adjudicated

—

Bars are the share of ingredient records carrying each description. High agreement means the sources replicate each other — not necessarily that they are right.

Published thresholds

15 measured values from the literature. Grouped by what was actually measured — a threshold smelled in clean water, tasted in the mouth, or measured in a real food are three different quantities and are not pooled.

Orthonasal, in clean water

0.440 ppb – 6.0 ppb

The reference measurement — smelled in water. OAV is computed against this.

Threshold	Matrix	Source	Paper
0.440 ppb	water	PMC open access	—
6.0 ppb	water	PMC open access	—

In a food matrix

1.1 ppb – 75.0 ppb

Measured in a real food, where the matrix shifts detection — not a clean-water value.

Threshold	Matrix	Source	Paper
1.1 ppb	water (food: rum)	Literature corpus	38933460
1.3 ppb	water (food: wine)	Literature corpus	41365581
6.4 ppb	water (food: lamb)	Literature corpus	28344493
7.0 ppb	water (food: fish)	Literature corpus	24594176, 36144849, 37003052
10.7 ppb SIDA	water (food: cocoa)	Literature corpus	32902973
11.0 ppb SIDA	water (food: unknown)	Literature corpus	32902973, 11130664, 11837687 +18
19.6 ppb SIDA	water (food: mango)	Literature corpus	32625638, 29211747
75.0 ppb	water (food: soy sauce)	Literature corpus	17898513
1179 ppb	water (food: bread)	Literature corpus	41613919
Flagged: 109× from the median of this group. Excluded from the range above pending re-check against the source publication — shown rather than hidden.
1182 ppb	water (food: beef)	Literature corpus	37701748
Flagged: 109× from the median of this group. Excluded from the range above pending re-check against the source publication — shown rather than hidden.

In air

1.0 ppb – 60.0 ppb

Airborne detection — not comparable to a water threshold.

Threshold	Matrix	Source	Paper
1.0 ppb	air	PMC open access	—
60.0 ppb	air	PMC open access	—

Other matrix

6.0 ppb

Measured in a non-aqueous medium (oil, starch, cellulose).

Threshold	Matrix	Source	Paper
6.0 ppb	unknown	PMC open access	—

Only values we can attribute are listed. Where a compendium's licence does not permit public attribution its figures are omitted here, so every number on this page traces to a citable source.

Found in

Measured impact first, then profile share

Every ingredient known to contain undecadien-2-one. Ingredients with a measured concentration come first, ranked by odour activity; the rest follow by how large a share of that ingredient's profile this molecule is. The figure beside each is how many different compounds that ingredient has in total — not the concentration of undecadien-2-one in it.

201 cmpds

Into the chemistry?

Get a molecule-level pairing breakdown each week — which ingredients share a compound, and why it matters at the table. Free, no spam.

Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Try the pairing tools to see which ingredient combinations rely on undecadien-2-one, or compare two ingredients side-by-side.