A major chromogen found in p-aminosalicylic acid and sodium p-aminosalicylate dosage forms was identified to be 3,3'-dihydroxyazoxybenzene. This compound could he produced by oxidation or sunlight irradiation of m-aminophenol, a common impurity of paminosalicylic acid and sodium p-aminosalicylate. M
Nonaqueous titrimetric determination of isoniazid in presence of excess of sodium p-aminosalicylate in dosage forms
โ Scribed by C. J. Shishoo; M. B. Devani
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 224 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0022-3549
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โฆ Synopsis
Isoniazid in the presence of excess of sodium p-aminosalicylate is estimated by differential titration of the acetonitrile extract of the mixture against perchloric acid. Sodium p-aminosalicylate content is then calculated from the total basicity obtained by direct titration of the mixture with the same titrant. The procedure is applied to determine the isoniazid and sodium p-aminosalicylate content of tablets, granules, and cachets. The results obtained are comparable to those obtained by the official method.
Keyphrases 0 Isoniazid, Na p-aminosalicylate mixture-analysis 0 Differential titration, nonaqueous-analysis 0 Perchloric acid-
๐ SIMILAR VOLUMES
These data indicated that quantitative conversion of procarbazine hydrochloride to the azo compound occurred during the titration. No evident substitution of iodine into the phenyl ring resulted, therefore eliminating aromatic substitution as a source of interference.