Lactose

  • 4-(b-D-Galactosido)-D-glucose
  • D-Glucose, 4-O-b-D-galactopyranosyl
  • D-Lactose
  • Lactin
  • Lactobiose
  • Milk sugar
Formula
C12H22O11
Structure
Description
White hard crystalline powder.
Uses
Both forms of lactose are employed, with the form predominating: as a nutrient in preparing modified milk and food for infants and convalescents (Whittier).

Registry Numbers and Inventories.
CAS
63-42-3
EC (EINECS/ELINCS)
200-559-2
RTECS
OD9625000
RTECS class
Tumorigen; Reproductive Effector; Natural Product
Merck
12,5356
Beilstein/Gmelin
93796
Beilstein Reference
4-17-00-03066
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C12H22O11
Formula mass
342.3
Melting point, °C
222.8
Boiling point, °C
592
Solubility in water
Very soluble
pKa/pKb
12.39 (pKa)
Partition coefficient, pKow
-4.12

Hazards and Protection.
Storage
Store in a cool, dry place. Keep container closed when not in use.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. 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
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizers.
Decomposition
Carbon monoxide, 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. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Health.
Exposure effects
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Low hazard for usual industrial handling.
   Inhalation
Low hazard for usual industrial handling.
   Skin
May cause skin irritation. Low hazard for usual industrial handling.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Get medical aid if irritation or symptoms occur.
   Inhalation
Remove from exposure to fresh air immediately. Get medical aid if cough or other symptoms appear.
   Skin
Get medical aid if irritation develops or persists. Flush skin with plenty of soap and water.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.