2-octenal, (e)-

green aldehyde

Found in 4 ingredients across the CompKitchen flavor graph.

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

Properties

Odor threshold — orthonasal, in clean water: 4.0 ppb 1 published value · see all 4 with sources
CAS number: 2548-87-0
Retention index: 1278

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

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.

Orthonasal, in clean water

4.0 ppb

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

Threshold	Matrix	Source	Paper
4.0 ppb SIDA	water	Rychlik 1998 · 1 studies	—

Retronasal / in-mouth

125 ppb

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

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

Other matrix

4200 ppb – 7000 ppb

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

Threshold	Matrix	Source	Paper
4200 ppb SIDA	meat_water	Rychlik 1998 · 1 studies	—
7000 ppb SIDA	oil_orthonasal	Rychlik 1998 · 1 studies	—

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.

Thresholds in published tables

Numbers printed in open-access papers, grouped by the medium the table states. Median and full range of the values; “agree” means two or more papers whose middle 80% of values sit within 100×. Not reviewed.

Medium	Median	Range	Values	Papers	Papers agree?
air	3 µg/L air	0.0027–4	18	16	no (3.0 decades)
ethanol solution	9.05 ppb	3–15.1	2	2	yes
food matrix	3 ppb	0.0027–250	63	56	no (2.3 decades)
oil	27 ppb	3–120	6	6	yes
unstated	3 ppb	0.08–6.5e+04	92	84	yes
water	3 ppb	0.0027–61	75	70	yes

Found in

Measured impact first, then profile share

Every ingredient known to contain 2-octenal, (e)-. 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 2-octenal, (e)- in it.

265 cmpds

451 cmpds

474 cmpds

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