Ingredient Dictionary

ACETOIN

Acetoin is a methyl ketone that is butan-2-one substituted by a hydroxy group at position 3.

How much products actually contain

No product states its amount yet.

Of the products containing it, 0 list it before the 1% line and 2 after it (usually 1% or less).

Products using this ingredient

2 of 2 confirmed · likeliest to carry enough first

First Aid BeautyFirst Aid Beauty KP Bump Eraser Body Scrub 10% AHA Toasted Coconut
First Aid BeautyFirst Aid Beauty KP Bump Eraser Body Scrub 10% AHA Toasted Coconut 10 oz

Definition

Acetoin is a methyl ketone that is butan-2-one substituted by a hydroxy group at position 3. It has a role as a metabolite. It is a secondary alpha-hydroxy ketone and a methyl ketone.

Source: PubChem

US FDA substance register · UNII BG4D34CO2H · registered name ACETOIN · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Gives the product a scentPERFUMING

Safety & regulatory references

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

More data — names, identifiers, properties, test records, literature

Names & identifiers

ACETOININCI2-Butanone, 3-hydroxy-Synonym

CAS No.chemical registry number: 513-86-0
EC No.EU chemical inventory number: 208-174-1
DTXSIDUS EPA chemical ID: DTXSID0024399
DTXCIDUS EPA compound ID: DTXCID304399

IUPAC: 3-Hydroxybutan-2-one
Molecular formula: C4H8O2
Molecular weight: 88.106 g/mol

Measured properties

Appearance: Acetyl methyl carbinol appears as a light-yellow colored liquid that can form a crystalline solid when it dimerizes. Slightly denser than water. Hence sinks in water. Used to make other chemicals. · Liquid
Odour: Buttery odor · BLAND, WOODY, YOGURT ODOR
Boiling point: 148 °C at 760 mm Hg · 147.00 to 148.00 °C. @ 760.00 mm Hg
Melting point: 15 °C · 59 °F
Solubility: Sparingly soluble in ether, petroleum ether · Soluble in alcohol, slightly soluble in ether.
Density: 0.9972 g/cu cm at 17 °C · 1.005-1.019
Stability: Forms a solid dimer C8H16O4 on standing or on treatment with granulated zinc. The dimer is easily converted back to the monomer by melting, distilling, or dissolving. · Oxidizes gradually to diacetyl on exposure to air.
Melting/freezing point: 15 ℃
Initial boiling point and range: 148 ℃(at 760 mm Hg)
Flash point: 41.1 ℃
Vapour pressure: 2.7 ㎜Hg(at 25 ℃)
Water solubility: 1000000 ㎎/ℓ( 20 ℃)
Relative density: 1.009 (0.997~5.014(20/20℃))
n-Octanol/water partition coefficient (Kow): -0.36
Molecular weight: 88.10

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: PubChem · KOSHA safety data sheets (Korea)

What products actually use it for

What the 57 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

Fragrance55
Flavouring and nutrient2

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

3 skin studies and 2 eye studies are on record.

Classed as moderate1

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 5 studies

Category 6.3A (Category 2)
Skin Irritation · Read Across
Classification not possible
Skin Sensitization · Screening
Classification not possible
Skin Irritation · Screening
Classification not possible
Eye Irritation · Screening
Category 6.4A (Category 2A)
Eye Irritation · Read Across