1h-indole

Found in 3 ingredients across the CompKitchen flavor graph.

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

Properties

Odor description: fecal
Odor threshold — orthonasal, in clean water: 90.0 ppb – 140 ppb median 115 ppb · 2 published values · see all 13 with sources
CAS number: 120-72-9
Retention index: 1328

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

13 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

90.0 ppb – 140 ppb

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

Threshold	Matrix	Source	Paper
90.0 ppb SIDA	water	Rychlik 1998 · 1 studies	—
140 ppb	water_odor	Leffingwell	—

In a food matrix

0.660 ppb – 1292 ppb

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

Threshold	Matrix	Source	Paper
0.660 ppb	water (food: tomato)	Literature corpus	28050733
2.6 ppb	water (food: longjing green tea infusion)	Literature corpus	17898464, 17898513, 21750948 +16
3.3 ppb	water (food: unknown)	Literature corpus	21750948, 25763102, 27177033 +10
11.0 ppb	water (food: green tea infusion (jingshan cha))	Literature corpus	17898464, 17898513, 21750948 +16
11.0 ppb	water (food: reference standard (water))	Literature corpus	17898464, 17898513, 21750948 +16
17.0 ppb	water (food: chocolate)	Literature corpus	17898464
31.0 ppb	water (food: soy sauce)	Literature corpus	17898513
1290 ppb	water (food: rum)	Literature corpus	37932358
1292 ppb	water (food: bread)	Literature corpus	41613919
2340 ppb	water (food: fish)	Literature corpus	36950329
Flagged: 167× from the median of this group. Excluded from the range above pending re-check against the source publication — shown rather than hidden.

In air

0.300 ppb

Airborne detection — not comparable to a water threshold.

Threshold	Matrix	Source	Paper
0.300 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.

Found in

Measured impact first, then profile share

Every ingredient known to contain 1h-indole. 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 1h-indole in it.

364 cmpds

405 cmpds

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