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Analytical and Bioanalytical Chemistry|July 21, 2007
Pipette tip solid-phase extraction and gas chromatography - mass spectrometry for the determination of methamphetamine and amphetamine in human whole bloodChika Hasegawa, Takeshi Kumazawa, Xiao-Pen Lee, et al.Rapid Communications in Mass Spectrometry : RCM|July 12, 2008
Determination of diazepam and its metabolites in human urine by liquid chromatography/tandem mass spectrometry using a hydrophilic polymer columnHironobu Umezawa, Xiao-Pen Lee, Yoshiko Arima, et al.Talanta|October 31, 2008
Pipette tip solid-phase extraction and gas chromatography-mass spectrometry for the determination of mequitazine in human plasmaTakeshi Kumazawa, Chika Hasegawa, Xiao-Pen Lee, et al.Rapid Communications in Mass Spectrometry : RCM|January 19, 2006
Simultaneous determination of ten antihistamine drugs in human plasma using pipette tip solid-phase extraction and gas chromatography/mass spectrometryChika Hasegawa, Takeshi Kumazawa, Xiao-Pen Lee, et al.Journal of AOAC International|March 11, 2006
Analysis of phenothiazines in human body fluids using disk solid-phase extraction and liquid chromatographyAkemi Marumo, Takeshi Kumazawa, Xiao-Pen Lee, et al.Journal of Pharmaceutical and Biomedical Analysis|September 17, 2013
High-throughput determination of nonsteroidal anti-inflammatory drugs in human plasma by HILIC-MS/MSTetsuya Nemoto, Xiao-Pen Lee, Takeshi Kumazawa, et al.Journal of Pharmaceutical and Biomedical Analysis|December 28, 2005
Simple method for determination of triazolam in human plasma by high-performance liquid chromatography/tandem mass spectrometryXiao-Pen Lee, Takeshi Kumazawa, Masaya Fujishiro, et al.Pageof 1