title: Liquid-chromatographic determination of cephalosporins and chloramphenicol in serum.
abstract: A "high-performance" liquid-chromatographic technique involving a radial compression module is used for measuring chloramphenicol and five cephalosporin antibiotics: cefotaxime, cefoxitin, cephapirin, and cefamandol. Serum proteins are precipitated with acetonitrile solution containing 4'-nitroacetanilide as the internal standard. The drugs are eluted with a mobile phase of methanol/acetate buffer (30/70 by vol), pH 5.5. Absorbance of the cephalosporins is monitored at 254 nm. Standard curves are linear to at least 100 mg/L. The absorbance of chloramphenicol is monitored at 254 nm and 280 nm, and its standard curve is linear to at least 50 mg/L. The elution times for various other drugs were also determined, to check for potential interferents.
mesh_terms: D002511:Cephalosporins / Q000097:blood*; D002701:Chloramphenicol / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D011342:Procainamide / Q000032:analysis
chemical_list: D002511:Cephalosporins; D002701:Chloramphenicol; D011342:Procainamide