Applications
MALDI imaging mass spectrometry involves the visualization of the spatial distribution of proteins, peptides, drug candidate compounds and their metabolites, biomarkers or other chemicals within thin slices of sample such as animal tissue or plant. It is a promising tool for putative biomarker characterisation and drug development. Initially scientists take tissue slices mounted on microscope slides and apply a suitable MALDI matrix to the tissue, either manually or now automatically. Next, the microscope slide is inserted into a MALDI mass spectrometer. The mass spectrometer records the spatial distribution of molecular species such as peptides, proteins or small molecules. Suitable image processing software can be used to import data from the mass spectrometer to allow visualisation and comparison with the optical image of the sample. Recent work has also demonstrated the capacity to create three-dimensional molecular images using the MALDI imaging technology and co-registration of these image volumes to other imaging modalities such as magnetic resonance imaging (MRI).
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