Acetylcysteine

  • l-alpha-Acetamido-beta-mercaptopropionic acid
  • n-Acetylcysteine
  • n-Acetyl-L-Cysteine
  • n-Acetyl-n-Cysteine
  • n-Acetyl-3-mercaptoalanine
  • Broncholysin
Formula
C5H9NO3S
Structure
Description
White crystals. Slight acetic odor.
Uses
Mucolytic agent (adjuvant) for bronchopulmonary disorders.

Registry Numbers and Inventories.
CAS
616-91-1
EC (EINECS/ELINCS)
210-498-3
S 22 24/25
RTECS
HA1660000
RTECS class
Human Data
Merck
13,90
Beilstein/Gmelin
1724426
Beilstein Reference
4-04-00-03160
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C5H9NO3S
Formula mass
163.19
Melting point, °C
108 - 110
Boiling point, °C
371
Density
1.48 g/cm3
Solubility in water
200 g/L
pKa/pKb
3.24 (pKa)
Partition coefficient, pKow
-0.99

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Heavy metals, heavy metal salts, strong oxidizers.
Decomposition
Carbon monoxide, oxides of nitrogen, oxides of sulfur, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: For small fires, use water spray, dry chemical, carbon dioxide or chemical foam. Use extinguishing media most appropriate for the surrounding fire.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure effects
Fever may occur. Elevated blood pressure or abnormally low blood pressure may occur during an anaphylactoid reaction. with therapeutic use - dizziness during an anaphylactoid reaction has been reported. Elevated intracranial pressure during inhalational nac therapy has been reported. Seizures have been reported in laboratory animals.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Low hazard for usual industrial handling.
   Inhalation
May cause respiratory tract irritation. Low hazard for usual industrial handling.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation and possible damage.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
HS Code
2930 90 16