title: Indirect spectrophotometric determination of sodium ceftriaxone with n-propyl alcohol-ammonium sulfate-water system by extraction flotation of copper(II).
abstract: BACKGROUND
  Although the determination methods of sodium ceftriaxone has been increasingly reported, these methods have their inherent limits preventing them from being broadly applied in common laboratories. In order to circumvent this problem, a rapid and simple method for the indirect spectrophotometric determination of sodium ceftriaxone is reported.
  
  
  METHODS
  Sodium ceftriaxone was degraded completely in the presence of 0.20 mol/l sodium hydroxide in boiling water bath for 20 min. The thiol group (-SH) of the degradation product (I) of sodium ceftriaxone could reduce cupric to cuprous ions, and the resulting which was precipitated with the thiol group (-SH) of the degradation product (II) at pH 4.0. By determining the residual amount of copper (II), the indirect determination of sodium ceftriaxone can be achieved.
  
  
  RESULTS
  Standard curve of sodium ceftriaxone versus the flotation yield of copper(II) showed that sodium ceftriaxone could be determined in low concentrations. The linear range of sodium ceftriaxone was 0.70-32 microg/ml and the detection limit evaluated by calibration curve (3sigma/k) was found to be 0.60 microg/ml.
  
  
  CONCLUSIONS
  A simple and efficient method was developed and it has been successfully applied to the determination of sodium ceftriaxone in human serum and urine samples, respectively. It is expected that this method will find broad applications in the detection of cephalosporin derivatives with similar structure.
authors.affiliation: College of Chemistry and Environmental Science, Henan Normal University, The Key Laboratory of Environmental Pollution Control Technology of Henan, Xinxiang, Henan, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Quanmin
authors.initials: Q
authors.lastname: Li
mesh_terms: D000433:1-Propanol; D000645:Ammonium Sulfate; D002138:Calibration; D002443:Ceftriaxone / Q000032:analysis* / Q000097:blood / Q000737:chemistry / Q000652:urine; D003300:Copper / Q000032:analysis* / Q000097:blood / Q000652:urine; D006801:Humans; D006863:Hydrogen-Ion Concentration; D013053:Spectrophotometry / Q000379:methods*
chemical_list: D002443:Ceftriaxone; D003300:Copper; D000433:1-Propanol; D000645:Ammonium Sulfate