DEHYDROASCORBIC ACID Chemical Properties

Melting point:

228 °C (dec.)(lit.)

alpha 

D20 +56°

Boiling point:

389.3±38.0 °C(Predicted)

Density 

1.743±0.06 g/cm3(Predicted)

storage temp. 

-20°C

solubility 

DMSO (Slightly, Heated), Methanol (Slightly, Sonicated)

form 

Solid

pka

3.90(at 25℃)

color 

White to Dark Orange

Merck 

13,2886

Stability:

Light Sensitive

LogP

-1.702 (est)

CAS DataBase Reference

490-83-5(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xn

Risk Statements 

22

WGK Germany 

3

F 

1-8-10

HS Code 

2936270000

MSDS

• Language:English Provider:SigmaAldrich

DEHYDROASCORBIC ACID Usage And Synthesis

Chemical Properties

Orange Solid

Uses

The reversibly oxidized form of ascorbic acid.

Definition

ChEBI: Dehydroascorbic acid having the L-configuration.

Purification Methods

Crystallise dehydro-L(+)-ascorbic acid from MeOH. The anhydrous acid is formed by heating it in a vacuum at 100o/1hour to give a crisp glassy product which when shaken with absolute EtOH and then kept at 0o for 2days gives microcrystals of the anhydrous acid. This is then washed with absolute EtOH and dried in a vacuum. It has m 225o(dec) and is stable in acidic solution but decomposes rapidly in alkaline solution. A 1% solution of the anhydrous acid when dissolved in phthalate/HCl buffer pH 3.5 at 60o and cooled to 20o has [] 20D +56o(0minutes), +53.5o(2hours), +19o(3days), -2o(5days) and -6o(6days); then it becomes orange in colour. A freshly prepared 1% solution in H2O has [] D +50o(0minutes), +44o(2hours), +16o(3days) and 0o(5days). [Herbert et al. J Chem Soc 1270 1933, Kenyon et al. J Chem Soc 158 1948, Beilstein 18/5 V 411.]

DEHYDROASCORBIC ACID(490-83-5)Related Product Information

• Sodium sulfide
• Vitamin E
• Acetylsalicylic acid
• culture medium
• ACETYL-SEROTONIN, N-(SH)
• Collagen
• ANTIOXIDANT 765
• Ascorbic Acid
• DEHYDROASCORBIC ACID
• 2,3-HEXANEDIONE
• (S)-5-Hydroxymethyldihydrofuran-2-one
• Dihydrofuran-3(2H)-one
• TETRONIC ACID
• 2-Methyltetrahydrofuran-3-one
• D-Dehydroascorbic acid
• 1-DEHYDROASCORBIC ACID
• 5-(1,2-DIHYDROXYETHYL)-2,3,4(5H)-FURANTRIONE
• ASCORBIC ACID/DEHYDROASCORBIC ACID