1. Aixiang Liu, Fei Liu, Yu Xu*, Fang Xu, Wanqun Hu and Qingxiang Guo*, Determination of ritodrine in human plasma by high-performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry, Journal of Chromatography B, 2008, accepted.
2. Wanquan Hu, Yu Xu*, Fei Liu, Aixiang Liu, and Qingxiang Guo*, Rapid and sensitive liquid chromatography tandem mass spectrometry method for the quantification of ambroxol in human plasma, Biomedical Chromatography. 2008, accepted.
3. Fei Liu, Yu Xu*, Jinchang Huang, Shu Gao and Qingxiang Guo*, Sensitive liquid chromatography/mass spectrometry assay for the quantification of azithromycin in human plasma, Biomedical Chromatography. 2007, 21, 1272?1278.
4. Fei Liu, Yu Xu*, Shu Gao, Jundong zhang, Qingxiang Guo*, Determination of hydrochlorothiazide in human plasma by liquid chromatography/tandem mass spectrometry, Journal of Pharmaceutical and Biomedical Analysis 2007, 44, 1187?1191.
5. Yu Xu*, Jinchang Huang, Fei Liu, Shu Gao and Qingxiang Guo*，Quantitative analysis of racecadotril metabolite in human plasma using a liquid chromatography/tandem mass spectrometry，Journal of Chromatography B, 2007, 852,101-107.
6. Fei Liu, Yu Xu*, Lei Rui, Shu Gao, Haijun Dong and Qingxiang Guo*, Liquid chromatography/tandem mass spectrometry assay for the quantification of troxerutin in human plasma, Rapid Communication in Mass Spectrometry, 2006, 20(23), 3522-3526.
7. Jinchang Huang, Yu Xu*, Fei Liu，Shu Gao and Qingxiang Guo, Development of a liquid chromatography/tandem mass spectrometry assay for the quantification of lisinopril in human plasma, Rapid Communication in Mass Spectrometry, 2006, 20, 248-252.
8. Jinchang Huang, Yu Xu*, Shu Gao, Lei Rui and Qingxiang Guo, Development of a liquid chromatography/tandem mass spectrometry assay for the quantification of rabeprazole in human plasma, Rapid Communication in Mass Spectrometry, 2005, 19, 2321-2324.
9. Yu Xu, Lifeng Wan, Hojatollah Salehi, Wei Deng and Qingxiang Guo*, Microwave-assisted One-pot Synthesis of Trisubstituted Imidazoles on Solid Support，Heterocycles, 2004, 63(7), 1613-1618.
10. Yu Xu and Qingxiang Guo*, Syntheses of Heterocyclic Compounds under Microwave Irradiation，Heterocycles, 2004, 63(4), 903-974.
11. Yu Xu, Yanzhi Liu, Lei Rui, Lei Liu and Qingxiang Guo*, One-pot Solvent-free Synthesis of Tetra-substituted Imidazoles under Microwave Irradiation，Heterocycles, 2004, 63(1), 87-93.
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