title: A high-performance liquid chromatographic method for determination of hypoxanthine in cord plasma.
abstract: A reversed-phase high-performance liquid chromatographic method was developed for the analysis of hypoxanthine in cord plasma. Cord plasma was precipitated with ammonium sulphate and after centrifugation the supernatant was injected into the chromatographic system. Separation of hypoxanthine was optimal with phosphate buffer (20 mmol/l, pH 7.65-7.75) as the mobile phase. Limit of determination using 200 microliter of the sample was found to be 1 mumol/l with a coefficient of variation of less than 10%. The imprecision of this method at the 10 mumol/l level was about 2%. The method described in this report for determination of hypoxanthine in cord plasma would also be suitable for determination of hypoxanthine in other biological fluids in clinical investigations. We have also determined reference values for hypoxanthine in citrate-preserved cord plasma. Rigorous sampling conditions and sample handling are important to achieve accurate results.
authors.affiliation: Department of Clinical Chemistry, Falun Central Hospital, Sweden.
authors.forename: Y
authors.initials: Y
authors.lastname: Bergqvist
authors.forename: R
authors.initials: R
authors.lastname: Bäck
authors.forename: S
authors.initials: S
authors.lastname: Eckerbom
authors.forename: K
authors.initials: K
authors.lastname: Hallman
authors.forename: S
authors.initials: S
authors.lastname: Nilsson
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D005312:Fetal Blood / Q000032:analysis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007042:Hypoxanthines / Q000097:blood*; D012016:Reference Values
chemical_list: D007042:Hypoxanthines