Diloxanide Furoate
» Diloxanide Furoate contains not less than 98.0 percent and not more than 102.0 percent of C14H11Cl2NO4, calculated on the dried basis.
Packaging and storage
Preserve in tight, light-resistant containers at controlled room temperature.
USP Reference standards 11
USP Diloxanide Furoate RS.
Identification
B:
Ultraviolet Absorption 197U
Solution:
14 µg per mL.
Medium:
alcohol. The solution exhibits a maximum at 258 nm.
C:
Burn 20 mg by employing the method under Oxygen-Flask Combustion 471, using 10 mL of 1 N sodium hydroxide as the absorbing liquid. When the process is complete, acidify the liquid with nitric acid, and add a solution of silver nitrate (5 in 100). A white precipitate forms.
Melting range 741:
between 114 and 116.
Acidity
Shake 3 g with 50 mL of water, filter, wash the residue with three 20-mL portions of water, and combine the filtrate and washings. Titrate with 0.1 N sodium hydroxide VS using phenolphthalein TS as the indicator: not more than 1.3 mL of 0.1 N sodium hydroxide is required for neutralization.
Loss on drying 731
Dry it at 105 to constant weight: it loses not more than 0.5%.
Residue on ignition 281:
not more than 0.1%.
Related compounds
Adsorbent:
0.25-mm layer of chromatographic silica gel mixture.
Test solution
Dissolve an accurately weighed amount of Diloxanide Furoate in chloroform to obtain a solution having a concentration of about 100 mg per mL.
Standard solution
Dilute 0.5 mL of Test solution with chloroform to 200 mL.
Application volume:
5 µL.
Developing solvent system:
a mixture of dichloromethane and methanol (96:4).
Procedure
Proceed as directed for Thin-Layer Chromatography under Chromatography 621. Examine the plate under short-wavelength UV light: any secondary spot obtained from the Test solution is not more intense than the spot obtained from the Standard solution.
Assay
Dissolve about 300 mg of Diloxanide Furoate, accurately weighed, in 50.0 mL of dried pyridine, and titrate with 0.1 N tetrabutylammonium hydroxide VS, determining the endpoint potentiometrically using suitable electrodes (see Titrimetry 541). Perform a blank determination, and make any necessary correction. Each mL of 0.1 N tetrabutylammonium hydroxide is equivalent to 32.82 mg of C14H11Cl2NO4.
Auxiliary Information
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USP32NF27 Page 2159
Pharmacopeial Forum: Volume No. 27(1) Page 1778
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