4Macek J, Klima .1, Ptd~ek P. Rapid determination of valsartan in human plasma by protein precipitation and high-performance liq- uid chromatography[ J]. J Chromatogr B, 2006, 832 (1) : 169.
6Tabemero M J, Felli M L, Bermejo A M, et al. Determination of ketamine and amphetamines in hair by LC/MS/MS[ J]. Anal Bio- anal Chem,2009, (359) 2547.
8Horspool L J I, McKellar Q A. Determination of short-chain fatty acids in equine caecal liquor by ion exchange high performance liquid chromatography after solid phase extraction [ J ]. Biomed Chromatogr, 1991, 5(5): 202.
9Vuckovic D. Current trends and challenges in sample preparation for global metabolomics using liquid chromatography-mass spec- trometry[J]. Anal Bioanal Chem, 2012, 403(6) : 1523.
10Dajana Vuckovic, Sanja Risticevic, Janusz Pawliszyn. In vivo sol- id-phase microextraction in metabolomics : opportunities for the di- rect investigation of biological Systems[ J]. 2011, 50 : 5618.