1985 Volume 10 Issue 1 Pages 1-10
In this study, a high-performance liquid chromatographic method including a treatment with ion exchange resin following a deproteinization treatment, was studied for determination of cephaloridine in the rat urine which was contaminated by pieces of feces and diet pellets. The solvent system used Was 10% acetonitrile (v/v) in 0.1 M K2 HPO4 -H3 PO4 buffer, pH 7.5, and this was isocratically eluted on a reversed-phase column of NOVA-PAK C18. The urine sample containing cephaloridine was deproteinized, treated with a strongly basic anion exchange resin of Dowex-1-Chloride, and then chromatographed. In comparison to the sample treated by the simple deproteinization, the residual substances after the deproteinization, which interfered the cephaloridine peak, were removed by the following treatment with Dowex-1-Chloride, as was confirmed using a three-dimensional computing spectrophotometric monitor. Thus, the present method is considered to be useful in determination of cephaloridine in such body fluids as urine in which many interfering substances are contained.
