Mass Spectrometry-Based Tissue Imaging

In MALDI (matrix-assisted laser desorption/ionization) mass spectrometry, the sample consists of a thin film of proteins or peptides that has been cocrystallized with a matrix selected to “match” the frequency of a UV laser. The laser vaporizes and ionizes the sample, which is then mass-analyzed, typically in a time-of-flight (TOF) mass analyzer. Since the footprint of the laser is small, and the sample is a solid rather than a solution, it is easy to see how this led to the idea of “rastering” the laser across the sample to form a molecular image.

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