» Nadolol Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of nadolol (C17H27NO4).
Packaging and storage Preserve in tight containers.
USP Reference standards 11
Identification Transfer a quantity of powdered Tablets, equivalent to about 50 mg of nadolol, to a conical flask. Add 10 mL of 0.1 N hydrochloric acid, stir for 30 minutes, using a magnetic stirrer, and place in an ultrasonic bath for an additional 30 minutes. Centrifuge, and use the supernatant for the test solution. Apply, as streaks, 100 µL of the test solution and 100 µL of a Standard solution of USP Nadolol RS in 0.1 N hydrochloric acid having a concentration of about 5 mg per mL to a thin-layer chromatographic plate (see Chromatography 621) coated with a 0.25-mm layer of chromatographic silica gel mixture. Develop the chromatogram in a solvent system consisting of acetone, chloroform, and 2 N ammonium hydroxide (8:1:1) until the solvent front has moved about three-fourths of the length of the plate. Remove the plate from the developing chamber, allow the solvent to evaporate, and examine the chromatogram under short-wavelength UV light: the RF value of the principal spot obtained from the test solution corresponds to that obtained from the Standard solution.
Medium: 0.01 N hydrochloric acid; 900 mL.
Apparatus 1: 100 rpm.
Time: 50 minutes.
Procedure Determine the amount of C17H27NO4 dissolved, employing the procedure set forth in the Assay, except to prepare the Mobile phase using 560 mL of methanol and 1440 mL of water instead of 700 mL and 1300 mL, respectively, and adjusting with 0.1 N hydrochloric acid to a pH of 2.5. Use filtered portions of the solution under test, suitably diluted with Medium, if necessary, in comparison with a Standard solution having a known concentration of USP Nadolol RS in the same Medium.
Tolerances Not less than 80% (Q) of the labeled amount of C17H27NO4 is dissolved in 50 minutes.
Uniformity of dosage units 905: meet the requirements.
Mobile phase Prepare a filtered and degassed mixture of 700 mL of methanol and 1300 mL of water containing 5.84 g of sodium chloride and 1.0 mL of 0.1 N hydrochloric acid.
Standard preparation Dissolve an accurately weighed quantity of USP Nadolol RS in Mobile phase to obtain a solution having a known concentration of about 0.2 mg per mL.
Assay preparation Weigh and finely powder not less than 20 Tablets. Weigh accurately a portion of the powder, equivalent to about 20 mg of nadolol, and transfer to a 100-mL volumetric flask. Add about 75 mL of Mobile phase, place in an ultrasonic bath for 15 minutes, shaking intermittently, add Mobile phase to volume, and mix. Clarify the solution by filtration or centrifugation.
Chromatographic system (see Chromatography 621)The liquid chromatograph is equipped with a 220-nm detector and a 4.6-mm × 25-cm column that contains packing L16. The flow rate is about 1 mL per minute. Chromatograph replicate injections of the Standard preparation, and record the peak responses as directed for Procedure: the relative standard deviation is not more than 2.0%; and the tailing factor for the nadolol peak is not more than 3.
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 nadolol (C17H27NO4) in the portion of Tablets taken by the formula:
100C(rU / rS)in which C is the concentration, in mg per mL, of USP Nadolol RS in the Standard preparation; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.
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USP35NF30 Page 3979