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Mathew A, Keelor JD, Eijkel GB, Anthony IGM, Long J, Prangsma J, Heeren RMA, Ellis SR. Time-Resolved Imaging of High Mass Proteins and Metastable Fragments Using Matrix-Assisted Laser Desorption/Ionization, Axial Time-of-Flight Mass Spectrometry, and TPX3CAM. Anal Chem 2022; 95:1470-1479. [PMID: 36574608 PMCID: PMC9850352 DOI: 10.1021/acs.analchem.2c04480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The Timepix (TPX) is a position- and time-sensitive pixelated charge detector that can be coupled with time-of-flight mass spectrometry (TOF MS) in combination with microchannel plates (MCPs) for the spatially and temporally resolved detection of biomolecules. Earlier generation TPX detectors used in previous studies were limited by a moderate time resolution (at best 10 ns) and single-stop detection for each pixel that hampered the detection of ions with high mass-to-charge (m/z) values at high pixel occupancies. In this study, we have coupled an MCP-phosphor screen-TPX3CAM detection assembly that contains a silicon-coated TPX3 chip to a matrix-assisted laser desorption/ionization (MALDI)-axial TOF MS. A time resolution of 1.5625 ns, per-pixel multihit functionality, simultaneous measurement of TOF and time-over-threshold (TOT) values, and kHz readout rates of the TPX3 extended the m/z detection range of the TPX detector family. The detection of singly charged intact Immunoglobulin M ions of m/z value approaching 1 × 106 Da has been demonstrated. We also discuss the utilization of additional information on impact coordinates and TOT provided by the TPX3 compared to conventional MS detectors for the enhancement of the quality of the mass spectrum in terms of signal-to-noise (S/N) ratio. We show how the reduced dead time and event-based readout in TPX3 compared to the TPX improves the sensitivity of high m/z detection in both low and high mass measurements (m/z range: 757-970,000 Da). We further exploit the imaging capabilities of the TPX3 detector for the spatial and temporal separation of neutral fragments generated by metastable decay at different locations along the field-free flight region by simultaneous application of deflection and retarding fields.
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Affiliation(s)
- Anjusha Mathew
- Maastricht
MultiModal Molecular Imaging (M4i) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Joel D. Keelor
- Amsterdam
Scientific Instruments (ASI), Science Park 106, 1098 XG Amsterdam, The Netherlands
| | - Gert B. Eijkel
- Maastricht
MultiModal Molecular Imaging (M4i) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Ian G. M. Anthony
- Maastricht
MultiModal Molecular Imaging (M4i) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Jingming Long
- Amsterdam
Scientific Instruments (ASI), Science Park 106, 1098 XG Amsterdam, The Netherlands
| | - Jord Prangsma
- Amsterdam
Scientific Instruments (ASI), Science Park 106, 1098 XG Amsterdam, The Netherlands
| | - Ron M. A. Heeren
- Maastricht
MultiModal Molecular Imaging (M4i) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands,
| | - Shane R. Ellis
- Maastricht
MultiModal Molecular Imaging (M4i) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands,Molecular
Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, NSW 2522, Wollongong, Australia,
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2
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Wood D, Burleigh RJ, Smith N, Bortoletto D, Brouard M, Burt M, Nomerotski A, Plackett R, Shipsey I. Ion Microscope Imaging Mass Spectrometry Using a Timepix3-Based Optical Camera. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:2328-2332. [PMID: 36383767 PMCID: PMC9732873 DOI: 10.1021/jasms.2c00223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/24/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Ion microscopy allows for high-throughput mass spectrometry imaging. In order to resolve congested mass spectra, a high degree of timing precision is required from the microscope detector. In this paper we present an ion microscope mass spectrometer that uses a Timepix3 hybrid pixel readout with an optimal 1.56 ns resolution. A novel triggering technique is also employed to remove the need for an external time-to-digital converter (TDC) and allow the experiment to be performed using a low-cost and commercially available readout system. Results obtained from samples of rhodamine B demonstrate the application of multimass imaging sensors for microscope mass spectrometry imaging with high mass resolution.
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Affiliation(s)
- Daniel Wood
- Robert
Hooke Building, Department of Physics, University
of Oxford, Parks Road, OxfordOX1
3PP, United Kingdom
| | - Robert J. Burleigh
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OxfordOX1 3TA, United Kingdom
| | - Natasha Smith
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OxfordOX1 3TA, United Kingdom
| | - Daniela Bortoletto
- Robert
Hooke Building, Department of Physics, University
of Oxford, Parks Road, OxfordOX1
3PP, United Kingdom
| | - Mark Brouard
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OxfordOX1 3TA, United Kingdom
| | - Michael Burt
- Chemistry
Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OxfordOX1 3TA, United Kingdom
| | | | - Richard Plackett
- Robert
Hooke Building, Department of Physics, University
of Oxford, Parks Road, OxfordOX1
3PP, United Kingdom
| | - Ian Shipsey
- Robert
Hooke Building, Department of Physics, University
of Oxford, Parks Road, OxfordOX1
3PP, United Kingdom
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3
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Körber A, Keelor JD, Claes BSR, Heeren RMA, Anthony IGM. Fast Mass Microscopy: Mass Spectrometry Imaging of a Gigapixel Image in 34 Minutes. Anal Chem 2022; 94:14652-14658. [PMID: 36223179 PMCID: PMC9607864 DOI: 10.1021/acs.analchem.2c02870] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 09/22/2022] [Indexed: 11/29/2022]
Abstract
Mass spectrometry imaging (MSI) maps the spatial distributions of chemicals on surfaces. MSI requires improvements in throughput and spatial resolution, and often one is compromised for the other. In microprobe-mode MSI, improvements in spatial resolution increase the imaging time quadratically, thus limiting the use of high spatial resolution MSI for large areas or sample cohorts and time-sensitive measurements. Here, we bypass this quadratic relationship by combining a Timepix3 detector with a continuously sampling secondary ion mass spectrometry mass microscope. By reconstructing the data into large-field mass images, this new method, fast mass microscopy, enables orders of magnitude higher throughput than conventional MSI albeit yet at lower mass resolution. We acquired submicron, gigapixel images of fingerprints and rat tissue at acquisition speeds of 600,000 and 15,500 pixels s-1, respectively. For the first image, a comparable microprobe-mode measurement would take more than 2 months, whereas our approach took 33.3 min.
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Affiliation(s)
- Aljoscha Körber
- The
Maastricht MultiModal Molecular Imaging Institute (M4i), Division
of Imaging Mass Spectrometry, Maastricht
University, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
| | - Joel D. Keelor
- Amsterdam
Scientific Instruments B.V. (ASI), Science Park 106, Amsterdam 1098 XG, The Netherlands
| | - Britt S. R. Claes
- The
Maastricht MultiModal Molecular Imaging Institute (M4i), Division
of Imaging Mass Spectrometry, Maastricht
University, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
| | - Ron M. A. Heeren
- The
Maastricht MultiModal Molecular Imaging Institute (M4i), Division
of Imaging Mass Spectrometry, Maastricht
University, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
| | - Ian G. M. Anthony
- The
Maastricht MultiModal Molecular Imaging Institute (M4i), Division
of Imaging Mass Spectrometry, Maastricht
University, Universiteitssingel 50, Maastricht 6229 ER, The Netherlands
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4
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Mathew A, Eijkel GB, Anthony IGM, Ellis SR, Heeren RMA. Characterization of microchannel plate detector response for the detection of native multiply charged high mass single ions in orthogonal-time-of-flight mass spectrometry using a Timepix detector. JOURNAL OF MASS SPECTROMETRY : JMS 2022; 57:e4820. [PMID: 35347816 PMCID: PMC9287041 DOI: 10.1002/jms.4820] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 02/25/2022] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
Time-of-flight (TOF) systems are one of the most widely used mass analyzers in native mass spectrometry (nMS) for the analysis of non-covalent multiply charged bio-macromolecular assemblies (MMAs). Typically, microchannel plates (MCPs) are employed for high mass native ion detection in TOF MS. MCPs are well known for their reduced detection efficiency when impinged by large slow moving ions. Here, a position- and time-sensitive Timepix (TPX) detector has been added to the back of a dual MCP stack to study the key factors that affect MCP performance for MMA ions generated by nMS. The footprint size of the secondary electron cloud generated by the MCP on the TPX for each individual ion event is analyzed as a measure of MCP performance at each mass-to-charge (m/z) value and resulted in a Poisson distribution. This allowed us to investigate the dependency of ion mass, ion charge, ion velocity, acceleration voltage, and MCP bias voltage on MCP response in the high mass low velocity regime. The study of measurement ranges; ion mass = 195 to 802,000 Da, ion velocity = 8.4 to 67.4 km/s, and ion charge = 1+ to 72+, extended the previously examined mass range and characterized MCP performance for multiply charged species. We derived a MCP performance equation based on two independent ion properties, ion mass and charge, from these results, which enables rapid MCP tuning for single MMA ion detection.
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Affiliation(s)
- Anjusha Mathew
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS)Maastricht UniversityMaastrichtThe Netherlands
| | - Gert B. Eijkel
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS)Maastricht UniversityMaastrichtThe Netherlands
| | - Ian G. M. Anthony
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS)Maastricht UniversityMaastrichtThe Netherlands
| | - Shane R. Ellis
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS)Maastricht UniversityMaastrichtThe Netherlands
- Molecular Horizons and School of Chemistry and Molecular BioscienceUniversity of WollongongWollongongNSWAustralia
| | - Ron M. A. Heeren
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS)Maastricht UniversityMaastrichtThe Netherlands
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5
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Mathew A, Buijs R, Eijkel GB, Giskes F, Dyachenko A, van der Horst J, Byelov D, Spaanderman DJ, Heck AJR, Porta Siegel T, Ellis SR, Heeren RMA. Ion Imaging of Native Protein Complexes Using Orthogonal Time-of-Flight Mass Spectrometry and a Timepix Detector. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:569-580. [PMID: 33439014 PMCID: PMC7863068 DOI: 10.1021/jasms.0c00412] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/22/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
Native mass spectrometry (native MS) has emerged as a powerful technique to study the structure and stoichiometry of large protein complexes. Traditionally, native MS has been performed on modified time-of-flight (TOF) systems combined with detectors that do not provide information on the arrival coordinates of each ion at the detector. In this study, we describe the implementation of a Timepix (TPX) pixelated detector on a modified orthogonal TOF (O-TOF) mass spectrometer for the analysis and imaging of native protein complexes. In this unique experimental setup, we have used the impact positions of the ions at the detector to visualize the effects of various ion optical parameters on the flight path of ions. We also demonstrate the ability to unambiguously detect and image individual ion events, providing the first report of single-ion imaging of protein complexes in native MS. Furthermore, the simultaneous space- and time-sensitive nature of the TPX detector was critical in the identification of the origin of an unexpected TOF signal. A signal that could easily be mistaken as a fragment of the protein complex was explicitly identified as a secondary electron signal arising from ion-surface collisions inside the TOF housing. This work significantly extends the mass range previously detected with the TPX and exemplifies the value of simultaneous space- and time-resolved detection in the study of ion optical processes and ion trajectories in TOF mass spectrometers.
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Affiliation(s)
- Anjusha Mathew
- Maastricht
MultiModal Molecular Imaging (M4I) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Ronald Buijs
- NWO
Institute AMOLF Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Gert B. Eijkel
- Maastricht
MultiModal Molecular Imaging (M4I) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Frans Giskes
- Maastricht
MultiModal Molecular Imaging (M4I) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Andrey Dyachenko
- Biomolecular
Mass Spectrometry and Proteomics, Bijvoet Centre for Biomolecular
Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584
CH Utrecht, The Netherlands
- Netherlands
Proteomics Center, Padualaan
8, 3584 CH Utrecht, The Netherlands
| | | | - Dimitry Byelov
- Amsterdam
Scientific Instruments (ASI), Science Park 106, 1098 XG Amsterdam, The Netherlands
| | | | - Albert J. R. Heck
- Biomolecular
Mass Spectrometry and Proteomics, Bijvoet Centre for Biomolecular
Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584
CH Utrecht, The Netherlands
- Netherlands
Proteomics Center, Padualaan
8, 3584 CH Utrecht, The Netherlands
| | - Tiffany Porta Siegel
- Maastricht
MultiModal Molecular Imaging (M4I) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Shane R. Ellis
- Maastricht
MultiModal Molecular Imaging (M4I) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
- Molecular
Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Ron M. A. Heeren
- Maastricht
MultiModal Molecular Imaging (M4I) Institute, Division of Imaging
Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
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6
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Drake RR, Scott DA, Angel PM. Imaging Mass Spectrometry. Mol Imaging 2021. [DOI: 10.1016/b978-0-12-816386-3.00017-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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7
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Guo A, Burleigh RJ, Smith N, Brouard M, Burt M. High-Resolution Ion Microscope Imaging over Wide Mass Ranges Using Electrodynamic Postextraction Differential Acceleration. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:1903-1909. [PMID: 32811151 PMCID: PMC7472747 DOI: 10.1021/jasms.0c00167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/04/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
A time-dependent postextraction differential acceleration (PEDA) potential was used to temporally focus increasingly heavy ions in a stigmatic imaging mass spectrometer, allowing them to be imaged with high mass and spatial resolutions over a broad mass-to-charge (m/z) range. By applying a linearly rising potential to the ion extraction electrode, sequential m/z ratios were subjected to a changing electric field, allowing their foci to coincide at the detector. Using this approach, at least 75% of the maximum mass resolution was obtained over a 300-600 Da range when the ion microscope was focused around 450 Da, representing more than a 10-fold increase over the conventional single-field PEDA method.
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8
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Burleigh RJ, Guo A, Smith N, Green A, Thompson S, Burt M, Brouard M. Microscope imaging mass spectrometry with a reflectron. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:023306. [PMID: 32113397 DOI: 10.1063/1.5142271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
A time-of-flight microscope imaging mass spectrometer incorporating a reflectron was used to image mass-resolved ions generated from a 270 μm diameter surface. Mass and spatial resolutions of 8100 ± 700 m/Δm and 18 μm ± 6 μm, respectively, were obtained simultaneously by using pulsed extraction differential acceleration ion optical focusing to create a pseudo-source plane for a single-stage gridless reflectron. The obtainable mass resolution was limited only by the response time of the position-sensitive detector and, according to simulations, could potentially reach 30 200 ± 2900 m/Δm. The spatial resolution can be further improved at the expense of the mass resolution to at least 6 μm by increasing the applied extraction field. An event-triggered fast imaging sensor was additionally used to record ion images for each time-of-flight peak resolved during an experimental cycle, demonstrating the high-throughput capability of the instrument.
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Affiliation(s)
- Robert J Burleigh
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Ang Guo
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Natasha Smith
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Andrew Green
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Steve Thompson
- Ionoptika Limited, Unit B6, Millbrook Close, Chandler's Ford, Eastleigh SO53 4BZ, United Kingdom
| | - Michael Burt
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Mark Brouard
- The Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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9
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Iacobucci C, Suder P, Bodzon‐Kulakowska A, Antolak A, Silberring J, Smoluch M, Mielczarek P, Grasso G, Pawlaczyk A, Szynkowska MI, Tuccitto N, Stefanowicz P, Szewczuk Z, Natale G. Instrumentation. Mass Spectrom (Tokyo) 2019. [DOI: 10.1002/9781119377368.ch4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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10
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Dong Y, Li B, Aharoni A. More than Pictures: When MS Imaging Meets Histology. TRENDS IN PLANT SCIENCE 2016; 21:686-698. [PMID: 27155743 DOI: 10.1016/j.tplants.2016.04.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 03/29/2016] [Accepted: 04/07/2016] [Indexed: 05/28/2023]
Abstract
Attaining high-resolution spatial information is a recurrent challenge in biological research, particularly in the case of small-molecule distribution. Mass spectrometry imaging (MSI) is an innovative molecular histology technique that could provide such information. It allows in situ and label-free measurement of both the abundance and distribution of a variety of molecules at the tissue or single cell level. The application of MSI in plant research has received considerable attention; thus, in this review, we describe the current state of MSI in plants. In particular, we present an overview of MSI approaches, highlight the recent technical and methodological developments, and discuss a range of applications contributing to the field of plant science.
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Affiliation(s)
- Yonghui Dong
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Bin Li
- Department of Chemistry and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Asaph Aharoni
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel.
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11
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Bodzon-Kulakowska A, Suder P. Imaging mass spectrometry: Instrumentation, applications, and combination with other visualization techniques. MASS SPECTROMETRY REVIEWS 2016; 35:147-69. [PMID: 25962625 DOI: 10.1002/mas.21468] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 01/23/2015] [Indexed: 05/18/2023]
Abstract
Imaging Mass Spectrometry (IMS) is strengthening its position as a valuable analytical tool. It has unique ability to identify structures and to unravel molecular changes that occur in the precisely defined part of the sample. These unique features open new possibilities in the field of various aspects of biological research. In this review we briefly discuss the main imaging mass spectrometry techniques, as well as the nature of biological samples and molecules, which might be analyzed by such methodology. Moreover, a novel approach, where different analytical techniques might be combined with the results of IMS study, is emphasized and discussed. With such a fast development of IMS and related methods, we can foresee the promising future of this technique.
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Affiliation(s)
- Anna Bodzon-Kulakowska
- Department of Biochemistry and Neurobiology, Faculty of Materials Sciences and Ceramics, AGH University of Science and Technology, 30-059 Krakow, Poland
| | - Piotr Suder
- Department of Biochemistry and Neurobiology, Faculty of Materials Sciences and Ceramics, AGH University of Science and Technology, 30-059 Krakow, Poland
- Academic Centre for Materials and Nanotechnology (ACMiN), AGH University of Science and Technology, 30-059 Krakow, Poland
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12
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Ifa DR, Eberlin LS. Ambient Ionization Mass Spectrometry for Cancer Diagnosis and Surgical Margin Evaluation. Clin Chem 2015; 62:111-23. [PMID: 26555455 DOI: 10.1373/clinchem.2014.237172] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 09/28/2015] [Indexed: 01/12/2023]
Abstract
BACKGROUND There is a clinical need for new technologies that would enable rapid disease diagnosis based on diagnostic molecular signatures. Ambient ionization mass spectrometry has revolutionized the means by which molecular information can be obtained from tissue samples in real time and with minimal sample pretreatment. New developments in ambient ionization techniques applied to clinical research suggest that ambient ionization mass spectrometry will soon become a routine medical tool for tissue diagnosis. CONTENT This review summarizes the main developments in ambient ionization techniques applied to tissue analysis, with focus on desorption electrospray ionization mass spectrometry, probe electrospray ionization, touch spray, and rapid evaporative ionization mass spectrometry. We describe their applications to human cancer research and surgical margin evaluation, highlighting integrated approaches tested for ex vivo and in vivo human cancer tissue analysis. We also discuss the challenges for clinical implementation of these tools and offer perspectives on the future of the field. SUMMARY A variety of studies have showcased the value of ambient ionization mass spectrometry for rapid and accurate cancer diagnosis. Small molecules have been identified as potential diagnostic biomarkers, including metabolites, fatty acids, and glycerophospholipids. Statistical analysis allows tissue discrimination with high accuracy rates (>95%) being common. This young field has challenges to overcome before it is ready to be broadly accepted as a medical tool for cancer diagnosis. Growing research in new, integrated ambient ionization mass spectrometry technologies and the ongoing improvements in the existing tools make this field very promising for future translation into the clinic.
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Affiliation(s)
- Demian R Ifa
- Department of Chemistry, York University, Toronto, ON, Canada
| | - Livia S Eberlin
- Department of Chemistry, The University of Texas at Austin, Austin, TX.
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13
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Zhang J, Franzreb K, Aksyonov SA, Williams P. Mass Spectra and Yields of Intact Charged Biomolecules Ejected by Massive Cluster Impact for Bioimaging in a Time-of-Flight Secondary Ion Microscope. Anal Chem 2015; 87:10779-84. [PMID: 26452076 DOI: 10.1021/acs.analchem.5b01802] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Impacts of massive, highly charged glycerol clusters (≳10(6) Da, ≳ ± 100 charges) have been used to eject intact charged molecules of peptides, lipids, and small proteins from pure solid samples, enabling imaging using these ion species in a time-of-flight secondary ion microscope with few-micrometer spatial resolution. Here, we report mass spectra and useful ion yields (ratio of intact charged molecules detected to molecules sputtered) for several molecular species-two peptides, bradykinin and angiotensin II; two lipids, phosphatidylcholine and sphingomyelin; Irganox 1010 (a detergent); insulin; and rhodamine B-and show that useful ion yields are high enough to enable bioimaging of peptides and lipids in biological samples with few-micrometer resolution and acceptable signals. For example, several hundred molecular ion counts should be detectable from a 3 × 3 μm(2) area of a pure lipid bilayer given appropriate instrumentation or tens of counts from a minor constituent of such a layer.
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Affiliation(s)
- Jitao Zhang
- Department of Chemistry & Biochemistry, Arizona State University , PO Box 1604, Tempe, Arizona 85287-1604, United States
| | - Klaus Franzreb
- Department of Chemistry & Biochemistry, Arizona State University , PO Box 1604, Tempe, Arizona 85287-1604, United States
| | - Sergei A Aksyonov
- Department of Chemistry & Biochemistry, Arizona State University , PO Box 1604, Tempe, Arizona 85287-1604, United States
| | - Peter Williams
- Department of Chemistry & Biochemistry, Arizona State University , PO Box 1604, Tempe, Arizona 85287-1604, United States
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