title: Determination of potassium, sodium, calcium and magnesium in total parenteral nutrition formulations by capillary electrophoresis with contactless conductivity detection.
abstract: A simple method based on capillary electrophoresis with a capacitively coupled contactless conductivity detector (CE-C(4)D) was developed for the determination of potassium, sodium, calcium and magnesium in parenteral nutrition formulations. A hydro-organic mixture, consisting of 100 mM Tris-acetate buffer at pH 4.5 and acetonitrile (80:20, v/v), was selected as the background electrolyte. The applied voltage was 30 kV, and sample injection was performed in hydrodynamic mode. All analyses were carried out in a fused silica capillary with an internal diameter of 50 microm and a total length of 64.5 cm. Under these conditions, complete separation between all cations was achieved in less than 4 min. The CE-C(4)D method was validated, and trueness values between 98.6% and 101.8% were obtained with repeatability and intermediate precision values of 0.4-1.3% and 0.8-1.8%, respectively. Therefore, this method was found to be appropriate for controlling potassium, sodium, calcium and magnesium in parenteral nutrition formulations and successfully applied in daily quality control at the Geneva University Hospitals.
authors.affiliation: Hôpitaux Universitaire de Genève-Pharmacie, Rue Gabrielle-Perret-Gentil 4, 1211 Genève 14, Switzerland.
authors.forename: Susanne
authors.initials: S
authors.lastname: Nussbaumer
authors.forename: Sandrine
authors.initials: S
authors.lastname: Fleury-Souverain
authors.forename: Lucie
authors.initials: L
authors.lastname: Bouchoud
authors.forename: Serge
authors.initials: S
authors.lastname: Rudaz
authors.forename: Pascal
authors.initials: P
authors.lastname: Bonnabry
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Veuthey
mesh_terms: D002118:Calcium / Q000032:analysis; D002412:Cations / Q000032:analysis*; D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods*; D008274:Magnesium / Q000032:analysis; D010289:Parenteral Nutrition, Total / Q000379:methods*; D019999:Pharmaceutical Solutions / Q000737:chemistry*; D011188:Potassium / Q000032:analysis; D011786:Quality Control; D012964:Sodium / Q000032:analysis
chemical_list: D002412:Cations; D019999:Pharmaceutical Solutions; D012964:Sodium; D008274:Magnesium; D011188:Potassium; D002118:Calcium