Name of product: THEOPHYLLINE ANHYDROUS

CAS NO.: 58-55-9

Expiry date:4 years

Items

Specifications

Characters

White crystalline powder

Identification

conform

Appearance of solution

Clear and colourless

Melting range   ℃

270~274

Acidity  (0.01mol/LNaOH)   (ml)

≤1.0

Related substances[Ignore(<0.05)]:

Impurity A   (%)

≤0.1

Impurity B   (%)

≤0.1

Impurity C   (%)

≤0.1

Impurity D   (%)

≤0.1

Other single impurity   (%)

≤0.1

Total impurities   (%)

≤0.5

Heavy metals   (ppm)

≤20

Loss on drying   (%)

≤0.5

Residue on ignition   (%)

≤0.1

Assay(on dried basis)   (%)

99.0~101.0

Assay (on dried basis,HPLC)   (%)

97.0~102.0

Conclusion: The product is tested in accordance with bp2011/usp34.the above items meet the requirement.