Abstract
Mass spectrometry imaging (MSI) allows for the direct and simultaneous analysis of the spatial distribution of molecular species from sample surfaces such as tissue sections. One of the goals of MSI is monitoring the distribution of compounds at the cellular resolution in order to gain insights about the biology that occurs at this spatial level. Infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) imaging of cervical tissue sections was performed using a spot-to-spot distance of 10 μm by utilizing the method of oversampling, where the target plate is moved by a distance that is less than the desorption radius of the laser. In addition to high spatial resolution, high mass accuracy (±1 ppm) and high mass resolving power (140,000 at m/z = 200) were achieved by coupling the IR-MALDESI imaging source to a hybrid quadrupole Orbitrap mass spectrometer. Ion maps of cholesterol in tissues were generated from voxels containing <1 cell, on average. Additionally, the challenges of imaging at the cellular level in terms of loss of sensitivity and longer analysis time are discussed.
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Acknowledgments
The authors thank Professor Angela D. M. Kashuba and her group from UNC Eshelman School of Pharmacy for providing the cervical tissues samples. The authors also gratefully acknowledge the financial assistance received from the National Institutes of Health (R01GM087964), the W.M. Keck foundation, and North Carolina State University.
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Published in the topical collection Mass Spectrometry Imaging with guest editors Andreas Römpp and Uwe Karst.
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Nazari, M., Muddiman, D.C. Cellular-level mass spectrometry imaging using infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) by oversampling. Anal Bioanal Chem 407, 2265–2271 (2015). https://doi.org/10.1007/s00216-014-8376-5
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DOI: https://doi.org/10.1007/s00216-014-8376-5