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Multiplex Mass Spectrometric Imaging with Polarity Switching for Concurrent Acquisition of Positive and Negative Ion Images

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Journal of The American Society for Mass Spectrometry

Abstract

We have recently developed a multiplex mass spectrometry imaging (MSI) method which incorporates high mass resolution imaging and MS/MS and MS3 imaging of several compounds in a single data acquisition utilizing a hybrid linear ion trap-Orbitrap mass spectrometer (Perdian and Lee, Anal. Chem. 82, 9393–9400, 2010). Here we extend this capability to obtain positive and negative ion MS and MS/MS spectra in a single MS imaging experiment through polarity switching within spiral steps of each raster step. This methodology was demonstrated for the analysis of various lipid class compounds in a section of mouse brain. This allows for simultaneous imaging of compounds that are readily ionized in positive mode (e.g., phosphatidylcholines and sphingomyelins) and those that are readily ionized in negative mode (e.g., sulfatides, phosphatidylinositols and phosphatidylserines). MS/MS imaging was also performed for a few compounds in both positive and negative ion mode within the same experimental set-up. Insufficient stabilization time for the Orbitrap high voltage leads to slight deviations in observed masses, but these deviations are systematic and were easily corrected with a two-point calibration to background ions.

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Acknowledgments

The authors thank Emile de Leeuw at Thermo Fisher Scientific for providing them a software patch and for helpful conversations. This work was supported by the US Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences. The Ames Laboratory is operated by Iowa State University under DOE Contract DE-AC02-07CH11358.

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Correspondence to Young Jin Lee.

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Figure S1

MS/MS spectra used to generate MS/MS images in Figure 3. MS/MS of [PC (32:0) + K]+ (a), MS/MS of [PC (36:1) + K]+ (b), MS/MS of [PI (18:0/20:4) – H] (c) and MS/MS of [ST (d18:1/h24:0) – H] (d). Transitions used to generate images are labeled. m/z 886.7 in (c) is an isotope of precursor (m/z 885.5) that was included as a result of incomplete isolation but did not completely fragment because its secular frequency is slightly off from the activation frequency (PDF 129 kb) (PDF 129 kb)

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Korte, A.R., Lee, Y.J. Multiplex Mass Spectrometric Imaging with Polarity Switching for Concurrent Acquisition of Positive and Negative Ion Images. J. Am. Soc. Mass Spectrom. 24, 949–955 (2013). https://doi.org/10.1007/s13361-013-0613-1

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  • DOI: https://doi.org/10.1007/s13361-013-0613-1

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