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Biomolecular Imaging with a C60-SIMS/MALDI Dual Ion Source Hybrid Mass Spectrometer: Instrumentation, Matrix Enhancement, and Single Cell Analysis

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Journal of The American Society for Mass Spectrometry

Abstract

We describe a hybrid MALDI/C60-SIMS Q-TOF mass spectrometer and corresponding sample preparation protocols to image intact biomolecules and their fragments in mammalian spinal cord, individual invertebrate neurons, and cultured neuronal networks. A lateral spatial resolution of 10 μm was demonstrated, with further improvement feasible to 1 μm, sufficient to resolve cell outgrowth and interconnections in neuronal networks. The high mass resolution (>13,000 FWHM) and tandem mass spectrometry capability of this hybrid instrument enabled the confident identification of cellular metabolites. Sublimation of a suitable matrix, 2,5-dihydroxybenzoic acid, significantly enhanced the ion signal intensity for intact glycerophospholipid ions from mammalian nervous tissue, facilitating the acquisition of high-quality ion images for low-abundance biomolecules. These results illustrate that the combination of C60-SIMS and MALDI mass spectrometry offers particular benefits for studies that require the imaging of intact biomolecules with high spatial and mass resolution, such as investigations of single cells, subcellular organelles, and communities of cells.

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Acknowledgments

The authors are very grateful for instrumental design and troubleshooting advice provided by Alexandre Loboda at AB SCIEX (presently at Fludigm Corporation), Randy Pedder at Ardara Technologies, and the Winograd research group at Penn State University, particularly with Professor Nicholas Winograd, Melissa Passarelli, Anita Durairaj, and Lauren Jackson. Design assistance by Zhen Li and Kevin Tucker, precision machining by Michael A. Harland and Roger Smith at the Machine Shop of the School of Chemical Sciences at the University of Illinois at Urbana-Champaign, and cell dissection and culture assistance by Xiying Wang and Callie (Croushore) Kindt are also acknowledged. This work was supported by the Department of Energy Office of Biological and Environmental Research through grant DE SC0006642, and The National Resource for Aplysia funded by PHS grant P40 OD010952. The authors declare no competing financial interests.

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Correspondence to Jonathan V. Sweedler.

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Lanni, E.J., Dunham, S.J.B., Nemes, P. et al. Biomolecular Imaging with a C60-SIMS/MALDI Dual Ion Source Hybrid Mass Spectrometer: Instrumentation, Matrix Enhancement, and Single Cell Analysis. J. Am. Soc. Mass Spectrom. 25, 1897–1907 (2014). https://doi.org/10.1007/s13361-014-0978-9

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