» Minocycline for Injection is sterile, freeze-dried Minocycline Hydrochloride suitable for parenteral use. It contains the equivalent of not less than 90.0 percent and not more than 120.0 percent of the labeled amount of minocycline (C23H27N3O7).
Packaging and storage— Preserve in Containers for Sterile Solids as described under Injections 1 , protected from light.
Bacterial endotoxins 85 — It contains not more than 1.25 USP Endotoxin Units per mg of minocycline.
pH 791 : between 2.0 and 3.5, in a solution containing the equivalent of 10 mg of minocycline per mL.
Water, Method I 921 : not more than 3.0%, the Test Preparation being prepared as directed for a hygroscopic specimen.
in which re is the area response of any peak in the chromatogram of the Assay preparation having a retention time of about 0.86 relative to that of minocycline, and rt is the total area of the responses of all the peaks in the chromatogram: not more than 6.0% of epiminocycline is found.
Mobile phase, Standard preparation, Resolution solution, and Chromatographic system— Proceed as directed in the Assay under Minocycline Hydrochloride.
Assay preparation 1 (where it is represented as being in a single-dose container)—Constitute Minocycline 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 hypodermic needle and syringe, and dilute quantitatively with water to obtain a solution containing the equivalent of about 0.5 mg of minocycline (C23H27N3O7) per mL.
Assay preparation 2 (where the label states the quantity of minocycline in a given volume of constituted solution)—Constitute Minocycline for Injection in a volume of water, accurately measured, corresponding to the volume of solvent specified in the labeling. Dilute an accurately measured portion of the constituted solution quantitatively with water to obtain a solution containing the equivalent of about 0.5 mg of minocycline (C23H27N3O7) per mL.
in which L is the labeled quantity, in mg, of minocycline in the container, or in the volume of constituted solution taken; D is the concentration, in mg per mL, of minocycline in Assay preparation 1 or in Assay preparation 2, on the basis of the labeled quantity in the container, or in the portion of constituted solution taken, respectively, and the extent of dilution; and the other terms are as defined therein.