Matrix-assisted laser desorption/ionization time-of-flight mass analysis of peptides.

Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is one of the most useful techniques for determining the mass of biomolecules, with exceptional capabilities for mass analysis of peptides. Relative to other ionization techniques, it provides high sensitivity and excellent tolerance of salt and other common buffer components. Routine detection limits for peptides are in the subpicomole range. The ions commonly observed are the protonated molecules (M+H(+)), which makes data analysis relatively easy. This overview discusses instrument configuration and calibration, sample preparation, along with specific approaches for analyzing peptide mixtures, synthetic peptides, and chemical modifications of peptides.

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