Lactic acid
Synonyms
Propanoic acid, 2-hydroxy-;
DL-Lactic acid;
FEMA No. 2611;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Hydroxyalkyl Carboxylate
>>>> Hydroxy Linear Alkyl Carboxylate
Chemical Numbering System
CAS: 50-21-5
EINECS: 200-018-0
Molecular Formula & Molecular Weight
Molecular Formula: C3H6O3
Molecular Weight: 90.08
Structure
Properties
Appearance (1), liquid, low temperature: solid.
Solubility soluble in water.
Stability stable.
Risk Liquid form: corrosion, 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
|
guinea pig oral LD50 |
1810mg/kg[1] |
|
mouse oral LD50 |
4875mg/kg[1] |
|
quail oral LD50 |
> 2250mg/kg[1] |
|
rabbit skin LD50 |
> 2000mg/kg[1] |
|
rabbit oral LDLo |
5000mg/kg[1] |
|
rabbit rectal LDLo |
600mg/kg[1] |
|
rat oral LD50 |
3543mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent cleansing, dispersing abilities.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Liquid |
|
|
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 1886.173 Food safety national standard -- Food additive -- Lactic acid
(1b), Chinese Pharmacopoeia (2015 Edition) Lactic 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 cleansing agent.
2, Personal care products
Buffering agent, humectant, conditioning agent in personal care products.
* * * * * *
Further information:
(1), In accordance with Safety and Technical Standards for Cosmetics (2015 Edition) of China, be included in the restricted components.
Maximum content is 6% (as acid).
The pH value of the product is greater than or equal to 3.5 (except rinse-off hair products).
Used in non-sunscreen cosmetics, when content is greater than or equal to 3.0 (as acid) or when the label claims to contain it, this label should be noted that this product is used in conjunction with sunscreen cosmetics.
3, Food
Use as food additives (acidity regulator, perfume).
4, Medicine
Use as pharmaceutical ingredient (disinfectant and antiseptic). (This section is for reference only, should be implemented according to local Pharmacopoeia.)
5, Organic synthesis
Use as intermediate in organic synthesis.
6, Agriculture
Use as plant growth regulator.
Manufacturers
References
[1]: ChemIDplus. 50-21-5, Lactic acid
Update: 20140309(1); 20180917(2);