Agent Name

2-Mercaptopropionic acid

Alternative Name

Thiolactic acid

CAS Number

79-42-5

Formula

C3-H6-O2-S

Major Category

Other Classes

Synonyms

2-Mercaptopropanoic acid; 2-Thiolactic acid; 2-Thiolpropionic acid; alpha-Mercaptopropanoic acid; alpha-Mercaptopropionic acid; Propanoic acid, 2-mercapto-; Propionic acid, 2-mercapto-; Thiolactic acid; [ChemIDplus] Mercaptopropionic acid; [CAMEO] UN2936

Category

Organic Acids

Description

Liquid with a disagreeable odor; mp = 10 deg C; [Merck Index] Colorless liquid with a stench; mp = 10-14 deg C; [Alfa Aesar MSDS]

Sources/Uses

Used in depilatory and hair waving products; [Merck Index] Used as a flavoring agent; [FDA]

Comments

Safe when used as a flavoring agent in food; [JECFA] Toxic by ingestion and skin absorption; [CAMEO] Causes burns; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; Toxic by ingestion; [Alfa Aesar MSDS]

Exposure Assessment
Lethal Concentration

LCLo (rat) = 700 ppm

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

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Chemical Information

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Biomedical References

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: