Chloramphenicol Otic Solution
» Chloramphenicol Otic Solution is a sterile solution of Chloramphenicol in a suitable solvent. It contains not less than 90.0 percent and not more than 130.0 percent of the labeled amount of C11H12Cl2N2O5.
Packaging and storage Preserve in tight containers.
USP Reference standards 11
Identification 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.
Sterility 71 It meets the requirements when tested as directed for Membrane Filtration under Test for Sterility of the Product to be Examined.
pH 791: between 4.0 and 8.0, when diluted with an equal volume of water.
Water, Method I 921: not more than 2.0%.
Standard preparation Dissolve an accurately weighed quantity of USP Chloramphenicol RS in Mobile phase, and dilute quantitatively, and stepwise if necessary, with Mobile phase to obtain a solution having a known concentration of about 100 µg per mL. Filter a portion of this solution through a 0.5-µm or finer porosity filter, and use the clear filtrate as the Standard preparation.
Assay preparation Transfer an accurately measured volume of Otic Solution, equivalent to about 50 mg of chloramphenicol, to a 100-mL volumetric flask, dilute with Mobile phase to volume, and mix. Transfer 5.0 mL of the resulting solution to a 25-mL volumetric flask, dilute with Mobile phase to volume, and mix. Filter a portion of this solution through a 0.5-µm or finer porosity filter, and use the clear filtrate as the Assay preparation.
Procedure Proceed as directed for Procedure in the Assay under Chloramphenicol. Calculate the quantity, in mg, of C11H12Cl2N2O5 in each mL of the Otic Solution taken by the formula:
0.5(C / V)(rU / rS)in which V is the volume, in mL, of Otic Solution taken, and the other terms are as defined therein.
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USP35NF30 Page 2610