l-threonine

other nitrogen compound

Found in 581 ingredients across the CompKitchen flavor graph.

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

2D Lewis Structure

Formula: C4H9NO3
Molecular weight: 119.12 g/mol
PubChem CID: 6288 — full record on PubChem

Properties

Odor threshold — in a food matrix: 0.020 ppb – 0.190 ppb median 0.105 ppb · 2 published values · see all 2 with sources
Volatility: low
CAS number: 72-19-5
Retention index: 1420

Regulatory · United States

FEMA GRAS — Generally Recognized As Safe for flavoring use

✓ Exact match

FEMA number: 4710
GRAS publication: GRAS 25
FEMA primary name: L-THREONINE

Reported use levels (ppm by food category)

Typical vs maximum reported addition levels in finished food. Use as a regulatory ceiling reference — verify against the current GRAS publication for your product category.

Food category	Typical (ppm)	Maximum (ppm)
baked goods	50	200
beverages (alcoholic)	50	200
beverages (non-alcoholic)	50	200
breakfast cereal	50	200
cheese	50	200
chewing gum	50	200
condiments/ relishes	50	200
confectionery frostings	50	200
egg products	50	200
fats/oils	50	200
fish products	50	200
frozen dairy	50	200
fruit ices	50	200
gelatins/puddings	50	200
granulated sugar	50	200
gravies	50	200
hard candy	50	200
imitation dairy	50	200
instant coffee/tea	50	200
jams/jellies	50	200
meat products	50	200
milk products	50	200
nut products	50	200
other grains	50	200
poultry	50	200
processed fruits	50	200
processed vegetables	50	200
reconstituted vegetables	50	200
seasonings/ flavors	50000	100000
snack foods	50	200
soft candy	50	200
soups	50	200
sugar substitutes	50	200
sweet sauces	50	200

Source: FEMA GRAS publications 1-33.

Published thresholds

2 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

0.020 ppb – 0.190 ppb

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

Threshold	Matrix	Source	Paper
0.020 ppb	water (food: onion)	Literature corpus	—
0.190 ppb	water (food: unknown)	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.

Found in

Measured impact first, then profile share

Every ingredient known to contain l-threonine. 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 l-threonine in it.

19 cmpds

19 cmpds

19 cmpds

19 cmpds