White crystals or crystalline powder; Freely soluble in water, ethanol, acetone and acetic acid. Slightly soluble in ethyl acetate. Insoluble in ether.
1. Used in cosmetics as antioxidants, preventing skin aging, synergistic effects with phenol derivatives. Other functions, eg. Strong moisturizing effect; whitening effect; softening effect; transparent effect.
2. Used as food additive and pharmaceutical intermediates
3. As a nutrition supplement, such as anti-anxiety
|
Item |
Specification |
Result |
|
Appearance |
White crystalline powder |
Conforms |
|
Specific rotation [α]D20(C=2.H2O) |
-11.0°~ -12.0° |
-11.60° |
|
Transmittance |
98.0% min. |
98. 85% |
|
Melting point |
158℃~161℃ |
160℃ |
|
Ammonium |
0.02% max |
<0.02% |
|
Chloride |
0.02% max |
0.008% |
|
Sulfate |
0.02% max |
0.005% |
|
Heavy metals (as Pb) |
10ppm max |
<10ppm |
|
Arsenic |
1ppm max |
<1ppm |
|
Iron |
10ppm max |
9ppm |
|
Residue on ignition |
0.10% max |
0.08% |
|
Loss on drying |
0.50% max. |
0.2% |
|
Assay |
98.5~101.0% |
99.0% |
