Abstract
Over the past couple of years, imaging mass spectrometry (IMS) has arisen as a powerful tool to answer research questions in the biomedical field. Imaging mass spectrometry allows for label-free chemical imaging by providing full molecular information. The IMS technique best positioned for cell and tissue analysis is time-of-flight secondary ion mass spectrometry (ToF-SIMS) because it has the best spatial resolution of all the molecular IMS techniques and can detect many biochemical species and especially lipids with high sensitivity. Because one must rely on the mass and isotopic pattern of an ion in combination with positive correlations with lower mass fragments to help identify its structure, one major problem during ToF-SIMS experiments is the ambiguity when assigning a molecule to a certain mass peak. The solution are instruments with tandem MS capabilities as was already the case for many MALDI-ToF instruments more than a decade ago. It has been a few years since instruments with this capability were introduced and a number of interesting publications have been produced highlighting the advantages in biological SIMS work. Here, we present a protocol describing how tandem MS can be used to elucidate the structure of unknown or ambiguous mass peaks in biological tissue samples observed during ToF-SIMS imaging based on our experiences.
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Van Nuffel, S., Brunelle, A. (2022). TOF-SIMS Imaging of Biological Tissue Sections and Structural Determination Using Tandem MS. In: Lee, YJ. (eds) Mass Spectrometry Imaging of Small Molecules. Methods in Molecular Biology, vol 2437. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2030-4_5
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DOI: https://doi.org/10.1007/978-1-0716-2030-4_5
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