title: Development and validation of an HPLC-UV method for iodixanol quantification in human plasma.
abstract: Iodixanol is a widely used iso-osmolar contrast medium agent. Similar to iohexol, it can also be a good exogenous marker for the measurement of glomerular filtration rate (GFR). This article describes the development and validation of an HPLC-UV method for quantification of iodixanol in human plasma. Internal standard, iohexol (20 microl, 1 mg/ml), and perchloric acid (30 microl, 20%, v/v) were added to plasma samples (300 microl), followed by neutralization with 10 microl potassium carbonate (5M). Samples were centrifuged and 10 microl of the supernatant was injected onto a C(18) EPS analytical column (3 microm particle size, 150 mm x 4.6 mm). The extraction method yielded >95% recovery for both iodixanol and iohexol. The mobile phase consisted of 0.1% (w/v) sodium formate buffer and acetonitrile. Iohexol and iodixanol peaks were eluted at approximately 5 and 9 min, respectively using a fast gradient method. The assay lower limit of detection was 2.0 microg/ml and lower limit of quantification was 10 microg/ml. The calibration curves, assessed in six replicates, were linear over an iodixanol concentration range of 10-750 microg/ml. Intra- and inter-day accuracy was >95% and precision expressed as % coefficient of variation was <10%. This method is simple, accurate, precise and robust and can potentially be used for iodixanol quantification in large-scale clinical studies.
authors.affiliation: Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA.
authors.forename: Shripad D
authors.initials: SD
authors.lastname: Chitnis
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Akhlaghi
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods* / Q000592:standards; D003287:Contrast Media / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D006801:Humans; D012015:Reference Standards; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet; D014283:Triiodobenzoic Acids / Q000097:blood* / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D003287:Contrast Media; D014283:Triiodobenzoic Acids; C044834:iodixanol