Abstract
A newly developed liquid chromatographic system with a multiple electrode detector was used for quantification of neurochemical substances in ventricular fluid of patients with Parkinson's disease. During the analysis, an unknown peak was observed at almost the same high-performance liquid chromatography retention time as 5-hydroxytryptophan. Through the use of ion suppression techniques, voltammographic analysis and fast atom bombardment mass spectrometry, the compound was identified as O-methyldopa, the major metabolite of L-dopa.
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