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Determination of total or free cefazolin and metronidazole in human plasma or interstitial fluid by HPLC-UV for pharmacokinetic studies in man.
Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences 2019 April 13
Cefazolin (CFZ) plus metronidazole (MTZ) is commonly used for perioperative antibiotic prophylaxis. An HPLC-UV method is described for the simultaneous determination of total or free cefazolin and metronidazole in human plasma or in microdialysate of subcutaneous tissue. Separation was performed isocratically using a reversed phase column and phosphate buffer/acetonitrile as mobile phase. The validation characteristics were similar for both drugs. Linearity has been shown down to 0.1 mg/L (R > 0.9990). Intra- and inter-assay precision (CV) and in-accuracy were < 5%. The method was applied to the determination of cefazolin and metronidazole in plasma and microdialysate of surgical patients following 30-min intravenous infusion of cefazolin/metronidazole 2.0/0.5 g.
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