Introduction:
Vitamin C is a white monoclinic crystal or crystalline powder with melting point on 190 ℃ -192 ℃, no smell, sour, yellowish color after long time standing. The product is easily soluble in water, slightly soluble in ethanol, insoluble in ether, chloroform. The aqueous solution is acidic. 5% (W / V) aqueous solution PH2.1-2.6 (W / V), the rotation of aqueous solution is +20.5 ~ +21.5.
Specification:
Appearance | White or almost white, crystalline powder or colourless crystals |
Melting Point | About 190℃, with decomposition |
Identification | Positive reaction |
pH (with 5% water solution) | 2.1 ~ 2.6 |
pH (with 2% water solution) | 2.4 ~ 2.8 |
Appearance of solution | Clarity : clear; Colour: ≤BY7 |
Specific optical rotation | +20.5º~ +21.5º |
Loss on drying | ≤0.4% |
Impurity E | ≤0.2% |
Related substance | Impurity C: ≤0.15% Impurity D: ≤0.15% Unspecified impurities: ≤0.10% Total impurities: ≤0.2% |
Copper | ≤5.0ppm |
Iron | ≤2.0ppm |
Arsenic | ≤3.0ppm |
Lead | ≤2.0ppm |
Mercury | ≤1.0ppm |
Cadmium | ≤1.0ppm |
Heavy metals | ≤10ppm |
Sulphated ash | ≤0.1% |
Residual solvents | Meets the requirement |
Assay | 99.0%~100.5% |
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