L-Threo-2,3,4,5,6-pentahydroxy-1-hexenoic acid-4-lactone(50-81-7)
Product Identification
Product Name
L-Threo-2,3,4,5,6-pentahydroxy-1-hexenoic acid-4-lactone
Synonyms
3-Oxo-L-gulofuranolactone (enol form)
L-3-Ketothreohexuronic acid lactone
L-Ascorbic acid
L-Xyloascorbic acid
Vitamin C
Vitascorbol
CAS
50-81-7
Formula
C6H8O6
Molecular Weight
176.13
EINECS
200-066-2
RTECS
CI7650000
RTECS Class
Tumorigen; Drug; Mutagen; Reproductive Effector; Human Data
Merck
13,837
Beilstein/Gmelin
84272
Beilstein Reference
5-18-05-00026
Physical and Chemical Properties
Appearance
White crystals.
Solubility in water
330 g/L
Melting Point
190 - 192
Boiling Point
553
Vapor Pressure
2E-14 (25 C)
Density
1.694 g/cm3 (20 C)
pKa/pKb
4.13 (pKa)
Partition Coefficient
-2.11
Heat Of Vaporization
148.7 kJ/mol
Usage
As antioxidant in foodstuffs, to prevent rancidity, to prevent browning of cut apples & other fruit.
First Aid Measures
Ingestion
Never give anything by mouth to an unconscious person. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Wash mouth out with water. Get medical aid if irritation or symptoms occur.
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. If irritation develops, get medical aid.
Handling and Storage
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Do not expose to air. Store protected from light. Store under an inert atmosphere.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. Handle under an inert atmosphere. Store protected from air.
Hazards Identification
Ingestion
Ingestion of large amounts may cause gastrointestinal irritation. Low hazard for usual industrial handling. Large doses may cause diarrhea and acidification of the urine which may cause stones in the urinary tract.
Inhalation
May cause respiratory tract irritation. Low hazard for usual industrial handling.
Skin
May cause skin irritation. Low hazard for usual industrial handling.
Eyes
May cause eye irritation.
Exposure Controls/Personal Protection
Personal 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 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.
Poison Class
-
Fire Fighting Measures
Flash Point
276
Autoignition
380
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: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Upper exp. limit
14.5
Lower exp. limit
1.7
Fire Potential
This material is probably combustible.
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