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Derivatization procedures for peptides are described that can be performed with sub-picomolar amounts of sample and that are able to direct the formation of fragment ions in Postsource Decay (PSD) MALDI mass spectrometry. Location of a fixed charge (a quarternary ammonium ion) at the N-terminus of a peptide and modification of internal arginine residues (deletion of strong basicity) leads to a full...
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