Dehydroacetic acid
Synonyms
2H-Pyran-2,4(3H)-dione, 3-acetyl-6-methyl-;
3-Acetyl-6-methyl-2H-pyran-2,4(3H)-dione;
3-Acetyl-6-methylpyran-2,4(3H)-dione;
3-Acetyl-4-hydroxy-6-methyl-2H-pyran-2-one;
Category
Non-ionic surfactant
> Ester
>> Lactones
Chemical Numbering System
CAS: 520-45-6 / 771-03-9 (Enol form) / 16807-48-0
EINECS: 208-293-9 / 212-227-4 (Enol form) / N/A
Molecular Formula & Molecular Weight
Molecular Formula: C8H8O4
Molecular Weight: 168.15
Structure
Properties
Appearance (1), white crystal powder.
Solubility slightly soluble in water.
Stability stable.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
mouse intraperitoneal LD50 |
1186mg/kg[1] |
|
mouse oral LD50 |
1330mg/kg[1] |
|
rabbit skin LDLo |
5000mg/kg[1] |
|
rat oral LD50 |
500mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent preservative, antifungal, antimicrobial, antibacterial abilities.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Product standards
(1), Chinese standards
(1a), GB 29223 Food safety national standard -- Food additive -- Dehydroacetic Acid
4, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances or furtherly test for microorganisms, according to local regulations and standards.
Major Uses
1, Typical applications
Use as antimicrobial agent, preservative.
2, Personal care products
Preservative in personal care products.
Further information:
(1), In accordance with Safety and Technical Standards for Cosmetics (2015 Edition) of China, be included in the allowable preservatives.
Maximum concentration is 0.6% (as acid).
Not to be used in aerosol dispensers (sprays).
(2), In accordance with EU regulations (EC) No 1223/2009, directive 86/199/EEC, be included in Annex V/13.
Maximum concentration is 0.6% (as acid).
Not to be used in aerosol dispensers (sprays).
3, Organic synthesis
Use as intermediate in organic synthesis.
4, Forestry
Use as preservative.
5, Polymer
Use as plasticizer.
6, Food
Use as food additive (preservative).
Manufacturers
References
[1]: ChemIDplus. 520-45-6, Dehydroacetic Acid
Update: 20130918(1); 20200412(2);