Nitroglycerin Sublingual Tablets
» Nitroglycerin Sublingual Tablets contain not less than 90.0 percent and not more than 115.0 percent of the labeled amount of nitroglycerin (C3H5N3O9).
Packaging and storage
Preserve in tight containers, preferably of glass, and store at controlled room temperature. Each container holds not more than 100 Sublingual Tablets.
Labeling
The labeling indicates that the Sublingual Tablets are for sublingual use, and the label directs that the Sublingual Tablets be dispensed in the original, unopened container, labeled with the following statement directed to the patient. Warning: To prevent loss of potency, keep these tablets in the original container or in a supplemental nitroglycerin container specifically labeled as being suitable for Nitroglycerin Sublingual Tablets. Close tightly immediately after each use.
Identification
A:
Thin-Layer Chromatographic Identification Test 201
Test solution
Transfer an amount of finely powdered Sublingual Tablets, equivalent to about 1 mg of nitroglycerin, to a glass-stoppered vessel, add 1 mL of acetone, shake by mechanical means for 30 minutes, and filter.
Standard solution:
1 mg per mL, in acetone.
Developing solvent system:
a mixture of toluene, ethyl acetate, and glacial acetic acid (16:4:1).
Procedure
Proceed as directed in the chapter. Spray with a solution of diphenylamine in methanol (1 in 100), and irradiate the plate with short- and long-wavelength UV light for about 10 minutes.
B:
The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that in the chromatogram of the Standard preparation, as obtained in the Assay.
Disintegration 701:
2 minutes, determined as set forth for Sublingual Tablets.
Uniformity of dosage units 905:
meet the requirements.
procedure for content uniformity
Mobile phase, Standard preparation, and Chromatographic system
Proceed as directed in the Assay under Diluted Nitroglycerin.
Test preparation
Transfer 1 Sublingual Tablet to a suitable container, and dissolve in and dilute with Mobile phase to obtain a solution containing about 0.075 mg of nitroglycerin per mL.
Procedure
Separately inject equal volumes (about 20 µL) of the Standard preparation and the Test preparation into the chromatograph, record the chromatograms, and measure the responses for the major peaks. Calculate the quantity, in mg, of nitroglycerin (C3H5N3O9) in the portion of Sublingual Tablets taken by the formula:
VC(rU / rS)
in which V is the volume, in mL, of Mobile phase used to prepare the Test preparation; C is the concentration, in mg per mL, of USP Diluted Nitroglycerin RS in the Standard preparation; and rU and rS are the peak responses for nitroglycerin obtained from the Test preparation and the Standard preparation, respectively. The content of each of the 10 Sublingual Tablets is within the range of 75.0% and 135.0% of the labeled claim. If the content of not more than 1 Sublingual Tablet is outside the range of 75.0% and 135.0% and if the content of none of the Sublingual Tablets is outside the range of 60.0% and 150.0%, test 20 additional units. The requirements are met if the content of each of the additional 20 units falls within the range of 75.0% and 135.0% of the labeled claim.
Assay
Mobile phase, Standard preparation, and Chromatographic system
Prepare as directed in the Assay under Diluted Nitroglycerin.
Assay preparation
Dissolve not fewer than 20 Sublingual Tablets in Mobile phase, and dilute quantitatively, and stepwise if necessary, with Mobile phase to obtain a solution containing about 0.075 mg per mL of nitroglycerin.
Procedure
Separately inject equal volumes (about 20 µL) of the Standard preparation and the Assay preparation into the chromatograph, record the chromatograms, and measure the responses for the major peaks. Calculate the quantity, in mg, of nitroglycerin (C3H5N3O9) per Sublingual Tablet taken by the formula:
100 / (TDC)(rU / rS)
in which T is the number of Sublingual Tablets taken; D is the dilution factor of the Assay preparation; C is the concentration, in mg per mL, of USP Diluted Nitroglycerin RS in the Standard preparation; and rU and rS are the peak responses for nitroglycerin obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information
Please check for your question in the FAQs before contacting USP.
Chromatographic Column
USP32NF27 Page 3097
Pharmacopeial Forum: Volume No. 30(4) Page 1272
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.
|