Procedure for content uniformity— Perform the Assay on individual containers using Assay preparation 1 or Assay preparation 2, or both, as appropriate.

(Official January 1, 2007)

pH 3.4 Acetate buffer, Mobile phase, Internal standard solution, Standard preparation, and Chromatographic system— Proceed as directed in the Assay under Cefuroxime Sodium.

Assay preparation 1 (where it is represented as being in a single-dose container)—Constitute Cefuroxime for Injection in a volume of water, accurately measured, corresponding to the volume of solvent specified in the labeling. Withdraw all of the withdrawable contents, using a suitable hypodermic needle and syringe, and dilute quantitatively with water to obtain a solution containing about 1 mg of cefuroxime per mL. Immediately transfer 5.0 mL of the resulting solution to a 100-mL volumetric flask, add 20.0 mL of Internal standard solution, dilute with water to volume, and mix.

Assay preparation 2 (where the label states the quantity of cefuroxime in a given volume of constituted solution or suspension)—Constitute Cefuroxime for Injection in a volume of water, accurately measured, corresponding to the volume of solvent specified in the labeling. Dilute an accurately measured volume of the constituted solution or suspension quantitatively with water to obtain a solution containing about 1 mg of cefuroxime per mL. Immediately transfer 5.0 mL of the resulting solution to a 100-mL volumetric flask, add 20.0 mL of Internal standard solution, dilute with water to volume, and mix.

Procedure— Proceed as directed for Procedure in the Assay under Cefuroxime Sodium. Calculate the quantity, in mg, of cefuroxime (C16H16N4O8S) withdrawn from the container, or in the portion of constituted solution or suspension taken by the formula: in which L is the labeled quantity, in mg of cefuroxime (C16H16N4O8S), in the container, or in the volume of constituted solution or suspension taken; D is the concentration, in mg of cefuroxime (C16H16N4O8S) per mL, of Assay preparation 1 or Assay preparation 2, based on the labeled quantity in the container or in the portion of constituted solution or suspension taken, respectively, and the extent of dilution; C is the concentration, in mg of cefuroxime (C16H16N4O8S) per mL, of the Standard preparation; and RU and RS are the peak response ratios of cefuroxime to the internal standard obtained from the Assay preparation and the Standard preparation, respectively. Where the test for Uniformity of dosage units has been performed using the Procedure for content uniformity, use the average of these determinations as the Assay value.