[appearance]

White or slightly yellowish crystalline or crystalline powder, odorless, sour. Melting point 190 ~ 192℃, rotatory alpha D20=+21° ~ +22°. Soluble in water, soluble in ethanol, insoluble in chloroform, ether and benzene. The Ph value of 5% aqueous solution was 2.2 ~ 2.5. In dry air is relatively stable, its aqueous solution is unstable, especially in neutral or alkaline solution is quickly oxidized, light, heat and copper, iron and other metal ions will accelerate the oxidation. The ADI value of rat transoral LD505g/kg was not specified (FAO/WHO, 1994).

"Melting point"

190-194 ° C (dec)

Specific rotation

20.5 DHS (c = 10, H2O)

"Density"

,65 1 g/cm3

【 FEMA 】

2109

Refractive index

21 ° (C = 10, H2O)

Storage conditions

0 to 6 ° C

[solubility]

H2O: 50 mg/mL at 20 °C, clear, nearly colorless

[form]

powder

【 color 】

White to slightly yellow

[water solubility]

333 g/L (20 DHS C)