title: Bioanalysis of m-iodobenzylguanidine in plasma by high-performance liquid chromatography after derivatization with benzoin.
abstract: A sensitive chromatographic assay has been developed for m-iodobenzylguanidine (MIBG) in human plasma based on the derivatization with benzoin. MIBG is first isolated from plasma using solid-phase extraction on a cyanopropyl-modified silica phase. After evaporation of the eluate, a fluorescent derivative is formed using benzoin. The derivative is analysed by reversed-phase liquid chromatography using a mixture 60% (v/v) acetonitrile, 30% (v/v) water and 10% (v/v) of the 0.5 M Tris buffer (pH 8.0) as the eluent and fluorescence detection at 320 nm for excitation and 435 nm for emission, respectively. In the evaluated concentration range (2-200 ng/ml) precisions < or = 10% and accuracies in between 90 and 100% have been found, with 2 ng/ml being the lower limit of quantification using a 0.5-ml plasma sample volume. The assay can also be used without the internal standard benzylguanidine. The assay was successfully used to obtain a pharmacokinetic curve of MIBG.
authors.affiliation: Utrecht University, Faculty of Pharmacy, Department of Pharmaceutical Analysis, The Netherlands. r.w.sparidans@pharm.uu.nl
authors.forename: R W
authors.initials: RW
authors.lastname: Sparidans
authors.forename: B G
authors.initials: BG
authors.lastname: Taal
authors.forename: J H
authors.initials: JH
authors.lastname: Beijnen
mesh_terms: D019797:3-Iodobenzylguanidine / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D000368:Aged; D001573:Benzoin / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence
chemical_list: D019797:3-Iodobenzylguanidine; D001573:Benzoin