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Determination of dextromethorphan in human plasma using pipette tip solid-phase extraction and gas chromatography–mass spectrometry

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Abstract

Dextromethorphan was extracted from human plasma samples (100 μL) using MonoTip C18 tips, which are packed with C18-bonded monolithic silica gel that is attached to the inside of the tip. The samples, which contained dextromethorphan and trimeprazine as an internal standard (IS), were mixed with 200 μL of distilled water and 50 μL of 1 mol/L glycine–sodium hydroxide buffer (pH 10). The mixture was extracted to the C18 phase of the tip by 20 sequential aspirating/dispensing cycles using a manual micropipettor. The analytes retained on the C18 phase were then eluted with methanol by five sequential aspirating/dispensing cycles. The eluate was injected directly into a gas chromatograph and detected by a mass spectrometer with selected ion monitoring in positive electron ionization mode. An Equity-5 fused silica capillary column (30 m × 0.32 mm i.d., film thickness 0.5 μm) gave adequate separation of the dextromethorphan, IS, and impurities. The recoveries of dextromethorphan and the IS spiked into plasma were >87.4%. The regression equation for dextromethorphan showed excellent linearity from 2.5 to 320 ng/mL of plasma, and the limit of detection was 1.25 ng/mL of plasma. The intraday and interday coefficients of variation were less than 10.5% and 14.7%, respectively. The accuracy ranged from 91.9% to 107%. The validated method was successfully used to quantify the plasma concentration of dextromethorphan in a human subject after oral administration of the drug.

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Acknowledgment

We thank Dr. shota Miyazaki of GL Sciences, Tokyo, Japan, for kindly providing an electron micrograph of the monolithic silica gel. This study was supported in part by a grant-in-aid for Scientific Research (C) of Japan society for the Promotion of Science.

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Correspondence to Chika Hasegawa.

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Hasegawa, C., Kumazawa, T., Uchigasaki, S. et al. Determination of dextromethorphan in human plasma using pipette tip solid-phase extraction and gas chromatography–mass spectrometry. Anal Bioanal Chem 401, 2215–2223 (2011). https://doi.org/10.1007/s00216-011-5324-5

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  • DOI: https://doi.org/10.1007/s00216-011-5324-5

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