Semi-automatic liquid chromatographic analysis of pamidronate in urine after derivatization with 1-naphthylisothiocyanate

An existing sensitive chromatographic assay for pamidronate in urine has co nsiderably been automated. Using the same sample processor, the solid-phase extraction (SPE) was automated separately from the derivatization with 1-n aphthylisothiocyanate, the two-fold ion-pair Liquid-Liquid-extraction and t he treatment with hydrogen peroxide for the 2-20 ng/ml concentration range. The automatic procedure was preceded by a triple calcium precipitation and interrupted by evaporation of the SPE eluate under nitrogen. For the 0.5-5 mu g/ml concentration range one automatic sequence was used by avoiding ev aporation during the sample treatment. In addition to the labour-saving of the semi-automatic procedure, the daily sample-throughput was improved comp ared to the existing manual assay. Further, the validation showed marginal improvements in the precision, accuracy and lower Limit of quantification. (C) 1999 Elsevier Science B.V. All rights reserved.