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The Peptide RPC Column Characterisation Protocol was applied to 38 stationary phases, varying in ligand chemistry, base silica, end capping and pore size, which are suitable for the analysis of peptides. The protocol at low and intermediate pH is based on measuring retention time differences between peptides of different functionality to calculate selectivity delta values. The characterisation was designed to explore increases / decreases in positive or negative charge (deamidation), steric effect (i.e. racemisation / switch in amino ac
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