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Lactic acid

CAS No.: 50-21-5
Formula: C3H6O3
Molecular Weight: 90.08
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What is Lactic acid

2-Hydroxypropanoic acid, commonly known as lactic acid, is a versatile organic compound with the chemical formula C₃H₆O₃. It is a naturally occurring substance produced during anaerobic respiration in muscles and by certain bacteria during fermentation. Lactic acid is widely used in various industries, including food, cosmetics, pharmaceuticals, and biodegradable plastics. In the food industry, it serves as a preservative, flavor enhancer, and pH regulator. In cosmetics, it is valued for its moisturizing and exfoliating properties. Additionally, lactic acid plays a crucial role in the production of polylactic acid (PLA), a biodegradable polymer used in eco-friendly packaging. Its multifunctional applications make it an essential compound in modern science and industry.

Preparation Process: To prepare 2-hydroxypropanoic acid (lactic acid), follow these steps: 1. **Fermentation Method**: Use *Lactobacillus* bacteria to ferment carbohydrates (e.g., glucose or lactose) in anaerobic conditions at 30–40°C for 2–5 days. The bacteria metabolize sugars into lactic acid. 2. **Chemical Synthesis**: React acetaldehyde with hydrogen cyanide to form lactonitrile. Hydrolyze lactonitrile with sulfuric acid to yield lactic acid. 3. **Purification**: Neutralize the fermented broth or hydrolyzed mixture with calcium hydroxide, filter, and crystallize calcium lactate. Treat with sulfuric acid to regenerate lactic acid, then distill under reduced pressure. Ensure proper pH control and sterilization in fermentation.

Usage Scenarios: 2-Hydroxypropanoic acid, commonly known as lactic acid, has diverse applications across industries. In food production, it serves as a preservative, pH regulator, and flavor enhancer in dairy, meat, and beverages. In cosmetics, it acts as an exfoliant in skincare products due to its mild alpha-hydroxy acid (AHA) properties, promoting cell renewal. The pharmaceutical industry uses it in topical treatments for acne and keratosis. It also functions as a monomer in biodegradable polylactic acid (PLA) plastics, used in packaging and medical implants. Additionally, lactic acid is employed in textile dyeing, leather tanning, and as a descaling agent in industrial cleaning. Its versatility makes it valuable in multiple sectors.

Lactic acid Basic Info
Chemical Name Lactic acid
Synonyms 2-Hydroxypropanoic acid;DL-Lactic acid;Lactic;2-HYDROXYPROPIONIC ACID;dl-lactate;Purac;actic acid;LACTIC ACID POWDER;Biolac;FEMA 2611
CAS No. 50-21-5
Molecular Formula C3H6O3
Molecular Weight 90.08
PSA 57.53000
LogP -0.54820
Safely Info
RTECS OD2800000
Hazard Class 8
Safety Statements 26-39-45-36/37/39
HS Code 29181100
WGK Germany 2
Packing Group III
RIDADR 3265
Risk Statements 38-41-34-37/38
Hazard Codes Xi,C
Caution Statement P264-P280-P302+P352-P305+P351+P338-P332+P313-P362+P364
Hazard Declaration H315-H318
Symbol GHS05
Signal Word Danger
Lactic acid Price
United States: $50-$100
China: $30-$60
Russia: $40-$70
Germany: $60-$90
India: $20-$40
Japan: $70-$100
Brazil: $25-$45
South Korea: $35-$60
Philippines: $30-$50
United Kingdom: $60-$90
France: $70-$100
Mexico: $30-$50
Canada: $50-$80
South Africa: $20-$40
Egypt: $25-$45
Turkey: No results
Thailand: $30-$50
Indonesia: $25-$45
MSDS
MSDS
Name: Lactic acid reagent ACS Material Safety Data Sheet
Synonym: DL-2-Hydroxypropanoic acid
CAS: 50-21-5
Section 1 - Chemical Product   MSDS Name:Lactic acid reagent ACS Material Safety Data Sheet
Synonym:DL-2-Hydroxypropanoic acid

Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
CAS# Chemical Name content EINECS#
50-21-5
Hazard Symbols: XI
Risk Phrases:

Section 3 - HAZARDS IDENTIFICATION
  EMERGENCY OVERVIEW
Irritating to eyes, respiratory system and skin.
Potential Health Effects
Eye:
Causes severe eye irritation and possible burns. May cause chemical conjunctivitis and corneal damage.
Skin:
Causes severe skin irritation and possible burns. May cause skin rash (in milder cases), and cold and clammy skin with cyanosis or pale color.
Ingestion:
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns.
Inhalation:
Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
Aspiration may lead to pulmonary edema. May cause systemic effects.
Can produce delayed pulmonary edema. Causes severe respiratory tract irritation with possible burns.
Chronic:
Effects may be delayed.

Section 4 - FIRST AID MEASURES
  Eyes: Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation with water is required (at least 30 minutes).
Skin:
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
Ingestion:
Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
Inhalation:
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. Do NOT use mouth-to-mouth resuscitation. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
Notes to Physician:
Treat symptomatically and supportively.

Section 5 - FIRE FIGHTING MEASURES
  General Information:
As in any fire, 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. Use water spray to keep fire-exposed containers cool. Vapors may be heavier than air. They can spread along the ground and collect in low or confined areas. Containers may explode when heated.
Extinguishing Media:
Use agent most appropriate to extinguish fire. Cool containers with flooding quantities of water until well after fire is out. Use water spray, dry chemical, carbon dioxide, or appropriate foam.

Section 6 - ACCIDENTAL RELEASE MEASURES
  General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Vacuum or sweep up material and place into a suitable disposal container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, observing precautions in the Protective Equipment section. Avoid generating dusty conditions.
Provide ventilation.

Section 7 - HANDLING and STORAGE
  Handling:
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale. Discard contaminated shoes.
Storage:
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area.

Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
  Engineering Controls:
Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low.
Personal Protective Equipment Eyes: Wear chemical goggles. 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 minimize contact with skin.
Respirators:
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.

Section 9 - PHYSICAL AND CHEMICAL PROPERTIES
 
Physical State: Liquid above room te
Color: colorless - yellow
Odor: acrid odor
pH: Caustic-concentrated
Vapor Pressure: 0.0813 mm Hg @ 25
Viscosity: 6.69cP @ 25C
Boiling Point: 122 deg C @ 15mmHg
Freezing/Melting Point: > 16.8 deg C
Autoignition Temperature: Not applicable.
Flash Point: Not applicable.
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature:
Solubility in water: Soluble.
Specific Gravity/Density: 1.2000g/cm3
Molecular Formula: C3H6O3
Molecular Weight: 90.08

Section 10 - STABILITY AND REACTIVITY
  Chemical Stability:
Stable at room temperature in closed containers under normal storage and handling conditions.
Conditions to Avoid:
Incompatible materials, excess heat, strong oxidants.
Incompatibilities with Other Materials:
Strong bases, strong oxidizing agents, strong reducing agents, metals.
Hazardous Decomposition Products:
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.
Hazardous Polymerization: Has not been reported

Section 11 - TOXICOLOGICAL INFORMATION
  RTECS#:
CAS# 50-21-5: OD2800000 LD50/LC50:
CAS# 50-21-5: Draize test, rabbit, eye: 750 ug Severe; Draize test, rabbit, skin: 5 mg/24H Severe; Draize test, rabbit, skin: 100 mg/24H Moderate; Oral, mouse: LD50 = 4875 mg/kg; Oral, rat: LD50 = 3543 mg/kg; Skin, rabbit: LD50 = >2 gm/kg.
Carcinogenicity:
Lactic acid - Not listed by ACGIH, IARC, NIOSH, NTP, or OSHA.
See actual entry in RTECS for complete information.

Section 12 - ECOLOGICAL INFORMATION
  Other No information available.

Section 13 - DISPOSAL CONSIDERATIONS
  Dispose of in a manner consistent with federal, state, and local regulations.

Section 14 - TRANSPORT INFORMATION
 
IATA
Shipping Name: CORROSIVE LIQUID, ACIDIC, ORGANIC, N.O.S.*
Hazard Class: 8
UN Number: 3265
Packing Group: III
IMO
Shipping Name: CORROSIVE LIQUID, ACIDIC, ORGANIC, N.O.S.
Hazard Class: 8
UN Number: 3265
Packing Group: III
RID/ADR
Shipping Name: CORROSIVE LIQUID, ACIDIC, ORGANIC, N.O.S.
Hazard Class: 8
UN Number: 3265
Packing group: III

Section 15 - REGULATORY INFORMATION
 
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: XI
Risk Phrases:
R 36/37/38 Irritating to eyes, respiratory system
and skin.
Safety Phrases:
S 24/25 Avoid contact with skin and eyes.
S 28A After contact with skin, wash immediately with
plenty of water.
S 37 Wear suitable gloves.
S 45 In case of accident or if you feel unwell, seek
medical advice immediately (show the label where
possible).
WGK (Water Danger/Protection)
CAS# 50-21-5: 0
United Kingdom Occupational Exposure Limits
United Kingdom Maximum Exposure Limits
Canada
None of the chemicals in this product are listed on the DSL/NDSL list.
CAS# 50-21-5 is not listed on Canada's Ingredient Disclosure List.
Exposure Limits
US FEDERAL
TSCA
CAS# 50-21-5 is not listed on the TSCA inventory.
It is for research and development use only.


SECTION 16 - ADDITIONAL INFORMATION
N/A
SDS 1.0
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