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Microbiological assay for cefoxitin sodium in dosage form
Hérida Regina Nunes Salgado1, Greici Cristiani Gomes Tozo
1Faculdade de Ciências Farmacêuticas, Programa de Pós-graduação em Ciências Farmacêuticas, UNESP, Rod. Araraquara-Jaú, km 1, CEP 14801-902, Araraquara, SP, Brazil. salgadoh@fcfar.unesp.br
Abstract:
A microbiological assay applying the cylinder-plate method is described for determination of the activity of cefoxitin sodium in injectables. Using a strain of Staphylococcus epidermidis ATCC 12226 as the test organism, cefoxitin sodium was measured in concentrations ranging from 50.0 to 200.0 microg/mL. The validation showed that the method was linear (r = 0.9998), precise (RSD = 0.81%), and accurate. It was concluded that the microbiological assay is satisfactory for quantitation of cefoxitin sodium in injectables.
