Liquid chromatography/tandem mass spectrometry method for simultaneous determination of cocaine and its metabolite (−)ecgonine methyl ester in human acidified stabilized plasma samples
Yongzhen Liu, Bo Zheng, Stephanie Strafford, Ravi S. Orugunty, Michael P. Sullivan, Jeffrey Gus, Christian A. Heidbreder, Paul J. Fudala, Azmi Nasser
Abstract