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• W2332362190 abstract "Summary An automated column-switching technique coupled to isocratic high-performance liquid chromatography (HPLC) with fluorescence detection was developed for simultaneous determination of dextromethorphan and its three major metabolites, dextrorphan, hydroxymorphinan, and methoxymorphinan. After cleavage of conjugates by incubation with glucuronidase-arylsulfatase at 37°C for 15 h, plasma samples were injected directly into the HPLC system. Dextromethorphan and metabolites were retained on a cleanup column (10 × 4.6 mm internal diameter [ID]) filled with cyanopropyl (CN) material (Hypersil CPS, 10-μm particle size) while interfering proteins and lipids were washed to waste. After column switching, the drugs were eluted from the cleanup column and separated on Spherisorb CN material (5-μm particle size, column size 250 × 4.6 mm ID). Fluorescence detection was carried out with an excitation wavelength of 220 nm and an emission wavelength of 305 nm. Sample cleanup and HPLC separation were completed within 20 min. Regression analyses found linearity (r > 0.99) between drug concentration and detector response over a wide range—5-220 ng/ml for dextromethorphan, 5-550 ng/ml for dextrorphan, 5-500 ng/ml for hydroxymorphinan, and 5-200 ng/ml for methoxymorphinan. The limit of quantification was ≈5 ng/ml, and the recovery was >90% for all compounds. At concentrations of 20-500 ng/ml, the intra- and interassay coefficients of variation ranged from 3.5 to 14.6% and from 7.0 to 14.0%, respectively. The method is suitable for in vivo phenotyping of CYP2D6 activity, which catalyzes the O-demethylation of dextromethorphan to dextrorphan, and is also applicable to pharmacokinetic studies in man." @default.
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• W2332362190 date "1996-06-01" @default.
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• W2332362190 title "Automated Determination of Dextromethorphan and Its Main Metabolites in Human Plasma by High-Performance Liquid Chromatography and Column Switching" @default.
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• W2332362190 doi "https://doi.org/10.1097/00007691-199606000-00014" @default.
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