methylpropan-1-ol

Found in 1 ingredient across the CompKitchen flavor graph.

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

Properties

Odor description: chemical, fatty, fermented
Odor threshold — in a food matrix: 5.2 ppb – 1155 ppb median 476 ppb · 8 published values · see all 9 with sources
CAS number: 1120-21-4

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.

chemical, fatty, fermented shown above FlavorDB 2.0

chemical Flavordb Odor Column

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fermented Flavordb Odor Column

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fatty Flavordb Odor Column

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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

9 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.

In a food matrix

5.2 ppb – 1155 ppb

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

Threshold	Matrix	Source	Paper
5.2 ppb	water (food: tea)	Literature corpus	30257572, 30262095, 35521270 +1
45.0 ppb	water (food: fish)	Literature corpus	30257572, 30262095, 35521270 +1
53.0 ppb	water (food: melon)	Literature corpus	30257572, 30262095, 35521270 +1
57.0 ppb	water (food: lamb)	Literature corpus	30257572, 30262095, 35521270 +1
896 ppb	water (food: unknown)	Literature corpus	30257572, 30262095, 35521270 +1
1100 ppb	water (food: milk)	Literature corpus	30257572, 30262095, 35521270 +1
1109 ppb	water (food: beef)	Literature corpus	30257572, 30262095, 35521270 +1
1155 ppb	water (food: bread)	Literature corpus	30257572, 30262095, 35521270 +1

In air

870 ppb

Airborne detection — not comparable to a water threshold.

Threshold	Matrix	Source	Paper
870 ppb	air	Nagata 2003	—

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.

Where you'd actually smell it

Odor Activity Value = measured concentration ÷ odor threshold (896.0 ppb, the engine's canonical value — see the 9 published values). OAV ≥ 1 = perceptible.

Food	Concentration (ppb)	OAV	Source
grape	300000.0	335 ⚡	PMID 27047468
beer	37520.0	41.9 ⚡	PMID 37185768

Concentrations from PubMed Central Open Access papers (free literature corpus, MIT-style licensed). Copper = OAV ≥ 10 (strongly perceptible). Green = OAV ≥ 1 (perceptible).

Found in

Measured impact first, then profile share

Every ingredient known to contain methylpropan-1-ol. 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 methylpropan-1-ol in it. Full concentrations are in the OAV table above.

date

Fruit

421 cmpds

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