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Development and Validation of a Microbiological Agar Assay for Determination of Orbifloxacin in Pharmaceutical Preparations

Programa de Pós-graduação em Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas, Univ Estadual Paulista, Rod. Araraquara-Jaú, km 1, CEP 14801-902,Araraquara, SP, Brazil
Author to whom correspondence should be addressed.
Pharmaceutics 2011, 3(3), 572-581;
Received: 23 June 2011 / Revised: 9 August 2011 / Accepted: 25 August 2011 / Published: 29 August 2011
(This article belongs to the Special Issue Solid Dosage Forms)
PDF [165 KB, uploaded 29 August 2011]


Orbifloxacin is a fluoroquinolone with broad-spectrum antimicrobial activity, and belongs to the third generation of quinolones. Regarding the quality control of medicines, a validated microbiological assay for determination of orbifloxacin in pharmaceutical formulations has not as yet been reported. For this purpose, this paper reports the development and validation of a simple, sensitive, accurate and reproducible agar diffusion method to quantify orbifloxacin in tablet formulations. The assay is based on the inhibitory effect of orbifloxacin upon the strain of Staphylococcus aureus ATCC 25923 used as test microorganism. The results were treated statistically by analysis of variance and were found to be linear (r = 0.9992) in the selected range of 16.0–64.0 μg/mL, precise with relative standard deviation (RSD) of repeatability intraday = 2.88%, intermediate precision RSD = 3.33%, and accurate (100.31%). The results demonstrated the validity of the proposed bioassay, which allows reliable orbifloxacin quantitation in pharmaceutical samples and therefore can be used as a useful alternative methodology for the routine quality control of this medicine. View Full-Text
Keywords: orbifloxacin; fluoroquinolones; bioassay; validation orbifloxacin; fluoroquinolones; bioassay; validation

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Cazedey, E.C.L.; Salgado, H.R.N. Development and Validation of a Microbiological Agar Assay for Determination of Orbifloxacin in Pharmaceutical Preparations. Pharmaceutics 2011, 3, 572-581.

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