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An isocratic HPLC method with detection at 248 nm was developed and fully validated for the determination of tigecycline in rabbit plasma. Minocycline was used as an internal standard. A Hypersil BDS RP-C18 column (250 × 4.6 mm, 5 μm particle size) was used with the mobile phase phosphate buffer (pH 7.10, 0.070 M)–acetonitrile (76 + 24, v/v) at a flow rate of 1.0 mL/min. The elution time of tigecycline and minocycline was approximately 8.1 and 9.9 min, respectively. Calibration curves of tigecycline were linear in the concentration range of 0.021–3.15 μg/mL in plasma. The LOD and LOQ in plasma were estimated as 7 and 21 ng/mL, respectively. The intraday and interday precision values of the method were in the range of 5.0–7.1 and 5.6–9.1%, while the corresponding accuracy values were in the ranges of 92.8–111.1 and 97.6–102.3%, respectively. At the LOQ, the intraday precision was 18.7%, while intraday and interday accuracy values were 97.3 and 98.0%, respectively. Robustness of the proposed method was studied using a Plackett-Burman experimental design. A pharmacokinetic profile is presented for confirmation of the applicability of the method to pharmacokinetic studies.

Robust and Sensitive High-Performance Liquid Chromatographic-UV Detection Technique for the Determination of Tigecycline in Rabbit Plasma