Sensitive assay for the determination of cefazolin or ceftriaxone in plasma utilizing LC

  • Al-Rawithi S
  • Hussein R
  • Raines D
 et al. 
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Abstract

A rapid, specific and very sensitive liquid chromatographic assay using standard ultraviolet detection has been developed to measure cefazolin (CFZ) or ceftriaxone (CFX) in small samples (200 μl) of plasma using either drug as the internal standard for measurement of the other. A rapid extraction was performed using C18bonded Sep Pak cartridges with high extraction efficiency for both drugs. The chromatographic system employed the use of a Nova-Pak C184-μm cartridge with a radial compression system preceded by a Guard-Pak with a C18insert. The mobile phase consisted of an aqueous solution containing 10 mM of dibasic potassium phosphate and 10 mM cetyltrimethylammonium bromide (pH 6.5) with acetonitrile (73:27 v/v). The drug and internal standard (CFZ/CFX) were detected using a UV detector set at a wavelength of 274 nm. Assay results were linearly related to the concentration (r > 0.997) for the wide range which was examined (0.005-120 μg/ml) for either drug. We report the precision, accuracy, recovery, linearity, sensitivity and specificity of this assay. The intra-run and inter-run CV was less than 9.02%. This method is currently being used for clinical therapeutic monitoring and pharmacokinetic studies of CFZ and CFX in patients undergoing cesarean section. (C) 2000 Elsevier Science B.V.

Author-supplied keywords

  • Cefazolin
  • Ceftriaxone
  • Cephalosporins
  • Drug monitoring
  • Liquid chromatography
  • Pharmacokinetics

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Authors

  • Sameer Al-Rawithi

  • Rajaa Hussein

  • Dale A. Raines

  • Ibrahim Alshowaier

  • Wesam Kurdi

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