Spectrophotometric Determination of Enrofloxacin Through the Formation of a Binary Complex with Iron III, Ion-Pair and Charge-Transfer Complexation in Pure and Dosage Forms
作者:
Zeinab A. EL Sherif,
期刊:
Analytical Letters
(Taylor Available online 1999)
卷期:
Volume 32,
issue 1
页码: 65-78
ISSN:0003-2719
年代: 1999
DOI:10.1080/00032719908542599
出版商: Taylor & Francis Group
关键词: Enroflaxacin;lSpectrophotometry;iron III complex;ion-pair;Charge-transfer complexation method
数据来源: Taylor
摘要:
Three simple and accurate spectrophotometric methods are described for the determination of enrofloxacin, a new fluoroquinolone synthetic orally active broad spectrum antibacterial. The first method is based on the reaction with iron III forming a water soluble yellow complex with maximum absorbance at 434 nm. The method allows the determination of 25–140 μgml−1. The second method involves ion-pair formation with bromocresol purple (BCP) in presence of phthalate buffer (pH 4.8±0.4). The yellow ion-pair is extracted with chloroform and the absorbance is measured at 410 nm. The method allows the determination of 4–18 μgml−1. The third method is based on the reaction of the drug with 8-dichloro-5,6 dicyano-p-benzoquinone (DDQ) in methanol as π-acceptor to give a molecular charge-transfer complex, with maximum absorbance at 460 nm. The method permits the determination of 50–240 μgml−1. Optimization of different experimental conditions were described. Beer's law was obeyed for the three methods and the relative standard deviation was found to be less than 2%. The methods have been applied successfully to the analysis of commercially available enrofloxacin preparations without interference from the ingredient commonly found.
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