The Thermo Scientific LTQ-Orbitrap XL is a combination for ion trap and Orbitrap high resolution mass spectrometer. It is the best choice for proteomics and metabolomics research because of its powerful functions, stability and low operating costs, completely surpassing and replacing the Q-TOF system. It can identify and character the complex components by high resolution, accurate mass measurement and multi-level fragmentation analysis Thermo Scientific's patented ETD technology adds high-sensitivity post-translational modification analysis capabilities to LTQ-Orbitrap XL. The LTQ-Orbitrap XL coupled ETD forms the most powerful proteomics platform, providing three complementary dissociation techniques for deterministic protein/peptide characterization, post-translational modification (PTM) analysis (especially phosphorylation), And Top-down or Middle-down protein and peptide sequence analysis.