Simultaneous Determination of Malachite Green, Crystal Violet, Methylene blue and the Metabolite Residues in Aquatic Products by Ultra-Performance Liquid Chromatography with Electrospray Ionization Tandem Mass Spectrometry

Ying-Jiang Xu1,2, Xiu-Hui Tian1,2, Xiu-Zhen Zhang1,2, Xiang-Hong Gong1,2, Hui-Hui Liu1,2, Huan-Jun Zhang1,2, Hui Huang3 and Li-Min Zhang1,2* Marine Fisheries Research Institute of Shandong Province, Yantai 264006, People’s Republic of China, Shandong Province Key Laboratory of Restoration for Marine Ecology, Yantai 264006, People’s Republic of China, and College of Food Science and Technology, Shanghai Ocean University, Shanghai 200000, People’s Republic of China