3-methylnonane-2,4-dione

fruity ketone

Found in 7 ingredients across the CompKitchen flavor graph.

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

Properties

Odor description: hay, straw, burnt, fruity
Odor threshold — orthonasal, in clean water: 0.030 ppb 1 published value · see all 7 with sources
CAS number: 113486-29-6
Retention index: 1708

Not in FEMA GRAS publications 1-33. Of 3,367 listed flavoring substances, none match this compound name. May still be food-safe under other regulatory routes (FDA 21 CFR 172, EFSA, JECFA) — check femaflavor.org for the authoritative current list.

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.

hay FlavorDB 2.0, Flavordb Odor Column 2 sources agree

burnt, caramel, fruit, fruity, straw FlavorDB 2.0

hay-like, straw-like FlavorDB 2.0

hay-like FlavorDB 2.0

hay, straw, burnt, 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

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

0.030 ppb

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

Threshold	Matrix	Source	Paper
0.030 ppb SIDA	water	Rychlik 1998 · 1 studies	—

In a food matrix

0.046 ppb

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

Threshold	Matrix	Source	Paper
0.046 ppb	water (food: green tea infusion (jingshan cha))	Literature corpus	—
0.046 ppb	water (food: longjing green tea infusion)	Literature corpus	—

Retronasal / in-mouth

0.020 ppb – 1.5 ppb

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

Threshold	Matrix	Source	Paper
0.020 ppb SIDA	water_retronasal	Rychlik 1998 · 1 studies	—
1.5 ppb SIDA	oil_retronasal	Rychlik 1998 · 1 studies	—

Other matrix

1.5 ppb – 22.5 ppb

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

Threshold	Matrix	Source	Paper
1.5 ppb SIDA	cellulose	Rychlik 1998 · 1 studies	—
22.5 ppb SIDA	oil_orthonasal	Rychlik 1998 · 1 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 3-methylnonane-2,4-dione. 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 3-methylnonane-2,4-dione in it.

31 cmpds

320 cmpds

376 cmpds

564 cmpds