1-penten-3-one

fruity ketone Key food odorant

Found in 348 ingredients across the CompKitchen flavor graph.

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

2D Lewis Structure

Formula: C5H8O
Molecular weight: 84.12 g/mol
PubChem CID: 15394 — full record on PubChem

Key food odorant (individualist)

Dunkel et al. 2014

Identified in the meta-analysis of 227 food samples as one of 151 individualist odorants — appears in <5% of foods, carries the diagnostic signature of specific ingredients.

Source: Angew. Chem. Int. Ed. 2014, 53, 7124–7143

Properties

Odor description: fish, pungent
Odor threshold — orthonasal, in clean water: 1.1 ppb 2 published values · see all 7 with sources
Volatility: high
CAS number: 1629-58-9
Retention index: 1010

Regulatory · United States

FEMA GRAS — Generally Recognized As Safe for flavoring use

✓ Exact match

FEMA number: 3382
GRAS publication: GRAS 6
FEMA primary name: 1-PENTEN-3-ONE

Use-level matrix not extracted for this substance — check the source publication for current ppm guidance.

Source: FEMA GRAS publications 1-33.

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.

fish, pungent shown above Flavornet Cas

—

fish, pungent, peppery, mustard, garlic, onion FlavorDB 2.0

342

pungent, train oil-like FlavorDB 2.0

mushroom/citrus FlavorDB 2.0

citrus-like, pungent, green FlavorDB 2.0

green-leaf FlavorDB 2.0

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

7 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

1.1 ppb

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

Threshold	Matrix	Source	Paper
1.1 ppb	water_odor	Leffingwell	—
1.1 ppb SIDA	water	Rychlik 1998 · 2 studies	—

In a food matrix

0.250 ppb – 14.0 ppb

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

Threshold	Matrix	Source	Paper
0.250 ppb	water (food: longjing green tea infusion)	Literature corpus	34064846
14.0 ppb	water (food: melon)	Literature corpus	34064846
5930 ppb	water (food: unknown)	Literature corpus	34064846
Flagged: 424× from the median of this group. Excluded from the range above pending re-check against the source publication — shown rather than hidden.

Retronasal / in-mouth

3.2 ppb

Tasted rather than smelled — a different sense, not comparable.

Threshold	Matrix	Source	Paper
3.2 ppb SIDA	oil_retronasal	Rychlik 1998 · 1 studies	—

Other matrix

3.1 ppb

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

Threshold	Matrix	Source	Paper
3.1 ppb SIDA	oil_orthonasal	Rychlik 1998 · 2 studies	—

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 1-penten-3-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 1-penten-3-one in it.

65 cmpds

107 cmpds

176 cmpds

179 cmpds