Packaging and storage
Preserve in tight, light-resistant containers, in a cold place.
Labeling
Label it to indicate whether it is hydrous or anhydrous. Where the quantity of Ephedrine is indicated in the labeling of any preparation containing Ephedrine, this shall be understood to be in terms of anhydrous Ephedrine.
Identification
Accurately weigh about 100 mg, and add by buret the exact volume of 0.1 N sulfuric acid, determined in the
Assay, to neutralize it. Dilute with water in a volumetric flask to 25 mL. Mix 2 mL with 10 mL of alcohol, and evaporate on a steam bath with the aid of a current of air to dryness: the residue so obtained responds to
Identification test
A under
Ephedrine Sulfate.
Specific rotation 781S:
between
40.3
and
43.3
.
Test solution:
25 mg per mL, in 0.6 N hydrochloric acid.
Water, Method Ib 921:
between 4.5% and 5.5%, for hydrated Ephedrine; not more than 0.5% for anhydrous Ephedrine.
Chloride 221
A solution of 500 mg shows no more chloride than corresponds to 0.20 mL of 0.020 N hydrochloric acid (0.030%).
Sulfate
Dissolve 100 mg in 40 mL of water, and add 1 mL of 3 N hydrochloric acid and 1 mL of
barium chloride TS: no turbidity develops within 10 minutes.
Ordinary impurities 466
Test solution:
methanol.
Standard solution:
methanol.
Eluant:
a mixture of isopropyl alcohol, ammonium hydroxide, and chloroform (80:15:5).
Visualization:
1, followed by 4.
Organic volatile impurities, Method I 467:
meets the requirements.
Assay
Dissolve about 500 mg of Ephedrine, accurately weighed, in 10 mL of neutralized alcohol, and add 5 drops of
methyl red TS and 40.0 mL of 0.1 N hydrochloric acid VS. Titrate the excess acid with 0.1 N sodium hydroxide VS. Perform a blank determination (see
Residual Titrations under
Titrimetry 541). Each mL of 0.1 N hydrochloric acid is equivalent to 16.52 mg of C
10H
15NO.
Auxiliary Information
Staff Liaison :
Daniel K. Bempong, Ph.D., Scientist
Expert Committee : (MDPS05) Monograph Development-Pulmonary and Steroids
USP29NF24 Page 803
Pharmacopeial Forum : Volume No. 30(3) Page 839
Phone Number : 1-301-816-8143