MATRIX-ASSISTED LASER-DESORPTION IONIZATION MASS-SPECTROMETRY (MALDI-MS)

Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) has been responsible for solving many problems in structural biology. Mass analysis is now used routinely to confirm proper expression and processing of proteins, and to locate and identity post-translational modifications. Innovative advances in instrumentation have led to higher mass resolution and mass accuracy. New sample preparation methods are likewise yielding higher sensitivity plus greater tolerance for buffer components that have in the past suppressed signals at higher concentrations. Advancements in the technique have also led to new or improved applications in many areas, including peptide sequencing and the identification of proteins by database searching with peptide masses. Instruments with lower cost, smaller size, and higher performance are making mass measurements available to an increasing number of laboratories. MALDI-MS is poised to continue to improve in performance and in its usefulness for current and new applications.