Shimadzu and CovalX have partnered to offer an integrated MALDI solution for ultrahigh mass applications. The MegaTOFTM has been developed by optimizing the integration of a high performance Shimadzu linear MALDI TOF mass spectrometer with CovalX high-mass system, allowing outstanding detection of macromolecules up to 1500 kDa. MegaTOFTM MALDI MS gives access to a broad range of applications, including direct analysis of protein-protein interactions such as complexes or biopharmaceutical aggregates. For these analyses, CovalX developed special cross-linking reagents and buffers for a fast and specific stabilization of protein interactions. The reagents contain ‘cocktails’ of cross-linkers with different spacer lengths able to covalently bind specification.