alpha-isophorone

herbal terpenoid

Found in 2 ingredients across the CompKitchen flavor graph.

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

Properties

Odor threshold — in a food matrix: 1118 ppb – 1242 ppb median 1118 ppb · 3 published values · see all 4 with sources
CAS number: 78-59-1

Regulatory · United States

FEMA GRAS — Generally Recognized As Safe for flavoring use

✓ Exact match

FEMA number: 3553
GRAS publication: GRAS 11
FEMA primary name: ISOPHORONE

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

Source: FEMA GRAS publications 1-33.

Published thresholds

4 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

1118 ppb – 1242 ppb

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

Threshold	Matrix	Source	Paper
3.9 ppb	water (food: apple)	Literature corpus	36409721
Flagged: 287× from the median of this group. Excluded from the range above pending re-check against the source publication — shown rather than hidden.
1118 ppb	water (food: bread)	Literature corpus	38519512
1242 ppb	water (food: unknown)	Literature corpus	24441709, 30166567, 41315747 +1

In air

200 ppb

Airborne detection — not comparable to a water threshold.

Threshold	Matrix	Source	Paper
200 ppb	air (HS_hellman_small)	Cometto-Muñiz (PMC)	—

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 alpha-isophorone. 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 alpha-isophorone in it.

267 cmpds

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