Phensuximide
189.212,5-Pyrrolidinedione, 1-methyl-3-phenyl-, (±)-.
(±)-N-Methyl-2-phenylsuccinimide
[86-34-0].» Phensuximide contains not less than 97.0 percent and not more than 103.0 percent of C11H11NO2, calculated on the anhydrous basis.
Packaging and storage—
Preserve in tight containers.
Identification—
and 74
Water, Method I 
921
:
not more than 1.0%.
921:
not more than 1.0%.
Residue on ignition 281:
not more than 0.5%.
281:
not more than 0.5%.
Limit of cyanide—
Dissolve 1.0 g in 10 mL of warm alcohol, and add 3 drops of ferrous sulfate TS, 1 mL of 1 N sodium hydroxide, and a few drops of ferric chloride TS. Warm gently, and finally acidify with 2 N sulfuric acid: no blue precipitate or blue color is formed within 15 minutes.
Ordinary impurities 466—
466—
Test solution:
200 mg of phensuximide per mL in methylene chloride.
Standard solutions:
1.0, 2.0, and 4.0 mg per mL in methylene chloride.
Application volume:
5 µL.
Eluant:
a mixture of ethyl acetate and hexanes (1:1).
Visualization:
6.
Assay—
Transfer about 200 mg of Phensuximide, accurately weighed, to a 50-mL volumetric flask. Dissolve in 40 mL of alcohol, dilute with alcohol to volume, and mix. Transfer 5.0 mL of this solution to a 50-mL volumetric flask, dilute with alcohol to volume, and mix. Concomitantly determine the absorbances of this solution and of a Standard solution of USP Phensuximide RS, in the same medium having a known concentration of about 400 µg per mL, in 1-cm cells at the wavelength of maximum absorbance at about 258 nm, with a suitable spectrophotometer, using alcohol as the blank. Calculate the quantity, in mg, of C11H11NO2 in the Phensuximide taken by the formula:
0.5C(AU / AS)
in which C is the concentration, in µg per mL, of USP Phensuximide RS in the Standard solution, and AU and AS are the absorbances of the solution from Phensuximide and the Standard solution, respectively.
Auxiliary Information—
Please check for your question in the FAQs before contacting USP.
Chromatographic Column—
| Topic/Question | Contact | Expert Committee |
| Monograph | Ravi Ravichandran, Ph.D.
Senior Scientist 1-301-816-8330 |
(MDPP05) Monograph Development-Psychiatrics and Psychoactives |
| Reference Standards | Lili Wang, Technical Services Scientist 1-301-816-8129 RSTech@usp.org |
USP32–NF27 Page 3276
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.