tetrahydrofuran

caramel furan

Found in 32 ingredients across the CompKitchen flavor graph.

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

2D Lewis Structure

Formula: C4H8O
Molecular weight: 72.11 g/mol
PubChem CID: 8028 — full record on PubChem

Properties

Odor threshold — in a food matrix: 2.8 ppb 1 published value · see all 1 with sources
Volatility: high
CAS number: 109-99-9
Retention index: 861

Regulatory · United States

FEMA GRAS — Generally Recognized As Safe for flavoring use

? Partial match

FEMA number: 4686
GRAS publication: GRAS 25
FEMA primary name: (±)-2-METHYLTETRAHYDROFURAN-3-THIOL ACETATE

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	0.1	0.5
beverages (alcoholic)	0.02	0.05
beverages (non-alcoholic)	0.01	0.03
breakfast cereal	0.01	0.03
cheese	0.1	0.2
chewing gum	0.01	0.03
condiments/ relishes	0.01	0.03
confectionery frostings	0.01	0.03
egg products	0.01	0.03
fats/oils	0.01	0.03
fish products	0.01	0.03
frozen dairy	0.01	0.03
fruit ices	0.01	0.03
gelatins/puddings	0.02	0.05
granulated sugar	0.01	0.03
gravies	0.01	0.03
hard candy	0.01	0.03
imitation dairy	0.01	0.03
instant coffee/tea	0.01	0.03
jams/jellies	0.02	0.05
meat products	0.02	0.05
milk products	0.01	0.04
nut products	0.01	0.03
other grains	0.01	0.03
poultry	0.02	0.05
processed fruits	0.01	0.03
processed vegetables	0.01	0.03
reconstituted vegetables	0.01	0.03
seasonings/ flavors	0.01	0.03
snack foods	0.01	0.03
soft candy	0.01	0.03
soups	0.01	0.03
sugar substitutes	0.01	0.03
sweet sauces	0.02	0.05

Source: FEMA GRAS publications 1-33. 9 related FEMA records for this name — verify the exact substance for regulatory use.

Published thresholds

1 measured value 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

2.8 ppb

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

Threshold	Matrix	Source	Paper
2.8 ppb	water (food: unknown)	Literature corpus	41712015

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 tetrahydrofuran. 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 tetrahydrofuran in it.

101 cmpds

169 cmpds

172 cmpds

174 cmpds