azulene

herbal terpenoid

Found in 11 ingredients across the CompKitchen flavor graph.

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

2D Lewis Structure

Formula: C10H8
Molecular weight: 128.17 g/mol
PubChem CID: 9231 — full record on PubChem

Properties

Odor threshold — in a food matrix: 0.958 ppb – 1733 ppb median 35.0 ppb · 3 published values · see all 3 with sources
Volatility: high
CAS number: 275-51-4
Retention index: 1311

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.

Published thresholds

3 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

0.958 ppb – 1733 ppb

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

Threshold	Matrix	Source	Paper
0.958 ppb	water (food: mango)	Literature corpus	29211747
35.0 ppb	water (food: unknown)	Literature corpus	24137478, 31485001, 38166788 +4
1733 ppb	water (food: beef)	Literature corpus	38974721

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 (35.0 ppb, the engine's canonical value — see the 3 published values). OAV ≥ 1 = perceptible.

Food	Concentration (ppb)	OAV	Source
beef	28.3	0.81	—
mango	0.0	0.00	—

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 azulene. 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 azulene in it. Full concentrations are in the OAV table above.

21 cmpds

233 cmpds

267 cmpds

277 cmpds