3-methylpyrazine

roasted pyrazine Key food odorant

Found in 2 ingredients across the CompKitchen flavor graph.

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

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: butter, chocolate, coffee
Odor threshold — orthonasal, in clean water: 5.0 ppb 1 published value · see all 6 with sources
CAS number: 13360-65-1

Regulatory · United States

FEMA GRAS — Generally Recognized As Safe for flavoring use

? Partial match

FEMA number: 3133
GRAS publication: GRAS 4
FEMA primary name: 2-iso-BUTYL-3-METHYLPYRAZINEΣ

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

Source: FEMA GRAS publications 1-33. 3 related FEMA records 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.

Also filed as

3-methyl-pyrazine

Same molecule, unified here — previously counted and displayed as separate compounds.

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.

butter, chocolate, coffee shown above FlavorDB 2.0

coffee Flavordb Odor Column

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chocolate Flavordb Odor Column

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butter 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

6 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

5.0 ppb

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

Threshold	Matrix	Source	Paper
5.0 ppb SIDA	water	Rychlik 1998 · 3 studies	—

In a food matrix

0.785 ppb

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

Threshold	Matrix	Source	Paper
0.785 ppb	water (food: coffee)	Literature corpus	—

Retronasal / in-mouth

79.0 ppb

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

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

Other matrix

40.5 ppb – 57.0 ppb

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

Threshold	Matrix	Source	Paper
40.5 ppb SIDA	oil_orthonasal	Rychlik 1998 · 2 studies	—
57.0 ppb	oil (sunflower oil) (food: cocoa beans)	Literature corpus	—
57.0 ppb	oil (sunflower oil) (food: cocoa powder)	Literature corpus	—

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 (2.8926 ppb, the engine's canonical value — see the 6 published values). OAV ≥ 1 = perceptible.

Food	Concentration (ppb)	OAV	Source
flour	20000.0	6914 ⚡	DOI
peanut	7160.0	2475 ⚡	DOI
bread	3500.0	1210 ⚡	PMID 38840722
sunflower seed	1300.0	449 ⚡	PMID 31383910
coffee	239.0	82.6 ⚡	Corpus paper

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 3-methylpyrazine. 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-methylpyrazine in it. Full concentrations are in the OAV table above.

164 cmpds

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