Abstract
A simple, fast, fully automated method for plasma serotonin determination is described. Full automation is obtained by coupling two devices: a sample processing station and a solid-phase autosampler. The sample processing station dilutes the plasma sample and is then connected, on-stream, with the solid-phase autosampler. It firstly fills a loop with all the solvents necessary for the sample clean-up, then, inverting the flow, pumps these solvents through the silica-bonded cation-exchange disposable extraction cartridge positioned on the autosampler. For the elution, the cartridge is switched on-stream with the HPLC analytical column and serotonin is eluted by the HPLC mobile-phase. The HPLC separation is performed by ion-pairing reversed-phase liquid chromatography. The column effluent is completely reduced by an electrochemical reactor and serotonin is detected in an oxidation-mode by a dual-cell electrochemical detector. The plasma sample is 50 μl, the plasma sensitivity is 40 ng/l, the retention time is 6 min and the recovery is 95%. The repeatibility, the normal ranges for platelet-poor and for platelet-rich plasma have been established and correlation with manual HPLC calculated.
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