Here, we present detailed protocols for solid-state amide hydrogen/deuterium exchange mass spectrometry (ssHDX-MS) and solid-state photolytic labeling mass spectrometry (ssPL-MS) for proteins in solid powders. The methods provide high-resolution information on protein conformation and interactions in the amorphous solid-state, which may be useful in formulation design.
Moorthy, B. S., Iyer, L. K., Topp, E. M. Mass Spectrometric Approaches to Study Protein Structure and Interactions in Lyophilized Powders. J. Vis. Exp. (98), e52503, doi:10.3791/52503 (2015).