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  • Ascorbic Acid (Vitamin C)

Ascorbic Acid (Vitamin C)

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°.


ITEM

STANDARD

Appearance

White or  almost  white crystal  or  crystalline powder

Identification

Positive

Melting point

191   ~  192

pH (5%,  w/v)

2.2 ~   2.5

pH (2%,w/v)

2.4 ~   2.8

Specific optical  rotation

+20.5°  ~  +21.5°

Clarity  of  solution

Clear

Heavy metals

≤0.0003%

Assay (as C 6H 8O6, %)

99.0  ~  100.5

Copper

≤3 mg/kg

Iron

≤2 mg/kg

Mercury

≤1 mg/kg

Arsenic

≤2 mg/kg

Lead

≤2 mg/kg

Oxalic acid

≤0.2%

Loss   on drying

≤0.1%

Sulphated ash

≤0.1%

Residual solvents (as methanol)

≤500  mg/kg

Total  plate count (cfu/g)

≤ 1000

Yeasts  & molds (cfu/g)

≤100

Escherichia.  Coli/g

Absence

Salmonella/  25g

Absence

Staphylococcus aureus/ 25g

Absence

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