An HPLC method for levofloxacin determination and its application in biomedical analysis

Resumo

Levofloxacin is a bacteriostatic L-isomer of ofloxacin. This drug is a third generation fluoroquinolone. Its activity strongly depends on its concentration and the AUC/MIC ratio is the best indication of drug exposure. A simple, specific and fast HPLC method with fluorescence detection for assay of levofloxacin level in human plasma was developed. The separation was performed on a reversed phase column. The mobile phase contained 0.4% solution of triethylamine. The regression equation was linear within the concentration range 0.15–30.0 mg/L. The validation parameters i.e. accuracy, precision and stability did not exceed 10%. High recovery was observed. The developed method fulfils the validation parameters. Due to the short time of analysis it may be applied to biomedical analysis.