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pubmed-article:11043746pubmed:abstractTextCapillary electrophoresis (CE) with UV laser-induced native fluorescence detection was developed as a sensitive and selective assay for the direct determination of tramadol in human urine without extraction or preconcentration. The main problem in CE is the small inner diameter of the capillary which causes a low sensitivity with instruments equipped with a UV detector. Laser-induced native fluorescence with a frequency doubled argon ion laser at an excitation wavelength of 257 nm was used for the direct assay of tramadol in urine to enhance the limit of detection about 1,000-fold compared to UV absorption detection. The detection system consists of an imaging spectrograph and an intensified CCD camera, which views an illuminated 1.5 mm section of the capillary. This set-up is able to record the whole emission spectra of the analytes to achieve additionally wavelength-resolved electropherograms. In the concentration range of 20 ng/ml-5 microg/ml in human urine coefficients of correlation were better than 0.998. Within-day variation determined on four different concentrations showed accuracies ranging from 90.2 to 108.4%. The relative standard deviation (RSD) was determined to be less than 10%. Day-to-day variation presented accuracies ranging from 90.9 to 103.1% with an RSD less than 8%.lld:pubmed
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pubmed-article:11043746pubmed:authorpubmed-author:SchulzHHlld:pubmed
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pubmed-article:11043746pubmed:pagination271-8lld:pubmed
pubmed-article:11043746pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11043746pubmed:articleTitleAssay of tramadol in urine by capillary electrophoresis using laser-induced native fluorescence detection.lld:pubmed
pubmed-article:11043746pubmed:affiliationInstitute of Pharmaceutical Chemistry, University of Münster, Germany.lld:pubmed
pubmed-article:11043746pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11043746pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed