1
|
Lateral resolution in NALDI MSI: back to the future. Anal Bioanal Chem 2014; 407:2141-7. [DOI: 10.1007/s00216-014-8294-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 10/13/2014] [Accepted: 10/21/2014] [Indexed: 11/25/2022]
|
2
|
|
3
|
Sparvero L, Amoscato A, Dixon C, Long J, Kochanek P, Pitt B, Bayir H, Kagan V. Mapping of phospholipids by MALDI imaging (MALDI-MSI): realities and expectations. Chem Phys Lipids 2012; 165:545-62. [PMID: 22692104 PMCID: PMC3642772 DOI: 10.1016/j.chemphyslip.2012.06.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Revised: 05/30/2012] [Accepted: 06/01/2012] [Indexed: 02/07/2023]
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) has emerged as a novel powerful MS methodology that has the ability to generate both molecular and spatial information within a tissue section. Application of this technology as a new type of biochemical lipid microscopy may lead to new discoveries of the lipid metabolism and biomarkers associated with area-specific alterations or damage under stress/disease conditions such as traumatic brain injury or acute lung injury, among others. However there are limitations in the range of what it can detect as compared with liquid chromatography-MS (LC-MS) of a lipid extract from a tissue section. The goal of the current work was to critically consider remarkable new opportunities along with the limitations and approaches for further improvements of MALDI-MSI. Based on our experimental data and assessments, improvements of the spectral and spatial resolution, sensitivity and specificity towards low abundance species of lipids are proposed. This is followed by a review of the current literature, including methodologies that other laboratories have used to overcome these challenges.
Collapse
Affiliation(s)
- L.J. Sparvero
- Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Departments of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - A.A. Amoscato
- Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Departments of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - C.E. Dixon
- Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Neurosurgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - J.B. Long
- Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD 21910, USA
| | - P.M. Kochanek
- Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - B.R. Pitt
- Departments of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - H. Bayir
- Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Departments of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - V.E. Kagan
- Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Departments of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA
| |
Collapse
|
4
|
Lin TY, Green RJ, O'Connor PB. A gain and bandwidth enhanced transimpedance preamplifier for Fourier-transform ion cyclotron resonance mass spectrometry. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:124101. [PMID: 22225232 PMCID: PMC3253747 DOI: 10.1063/1.3660778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 10/20/2011] [Indexed: 05/31/2023]
Abstract
The nature of the ion signal from a 12-T Fourier-transform ion cyclotron resonance mass spectrometer and the electronic noise were studied to further understand the electronic detection limit. At minimal cost, a new transimpedance preamplifier was designed, computer simulated, built, and tested. The preamplifier design pushes the electronic signal-to-noise performance at room temperature to the limit, because of its enhanced tolerance of the capacitance of the detection device, lower intrinsic noise, and larger flat mid-band gain (input current noise spectral density of around 1 pA/√Hz when the transimpedance is about 85 dBΩ). The designed preamplifier has a bandwidth of ~3 kHz to 10 MHz, which corresponds to the mass-to-charge ratio, m/z, of approximately 18 to 61 k at 12 T. The transimpedance and the bandwidth can be easily adjusted by changing the value of passive components. The feedback limitation of the circuit is discussed. With the maximum possible transimpedance of 5.3 MΩ when using an 0402 surface mount resistor, the preamplifier was estimated to be able to detect ~110 charges in a single scan.
Collapse
Affiliation(s)
- Tzu-Yung Lin
- School of Engineering, University of Warwick, Coventry, United Kingdom
| | | | | |
Collapse
|
5
|
Smith DF, Aizikov K, Duursma MC, Giskes F, Spaanderman DJ, McDonnell LA, O’Connor PB, Heeren RMA. An external matrix-assisted laser desorption ionization source for flexible FT-ICR Mass spectrometry imaging with internal calibration on adjacent samples. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:130-7. [PMID: 21472551 PMCID: PMC3042104 DOI: 10.1007/s13361-010-0003-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 09/02/2010] [Accepted: 10/08/2010] [Indexed: 05/03/2023]
Abstract
We describe the construction and application of a new MALDI source for FT-ICR mass spectrometry imaging. The source includes a translational X-Y positioning stage with a 10×10 cm range of motion for analysis of large sample areas, a quadrupole for mass selection, and an external octopole ion trap with electrodes for the application of an axial potential gradient for controlled ion ejection. An off-line LC MALDI MS/MS run demonstrates the utility of the new source for data- and position-dependent experiments. A FT-ICR MS imaging experiment of a coronal rat brain section yields ∼200 unique peaks from m/z 400-1100 with corresponding mass-selected images. Mass spectra from every pixel are internally calibrated with respect to polymer calibrants collected from an adjacent slide.
Collapse
Affiliation(s)
- Donald F. Smith
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Konstantin Aizikov
- Mass Spectrometry Resource, Department of Biochemistry, Boston University School of Medicine, Boston, MA USA
| | - Marc C. Duursma
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Frans Giskes
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Dirk-Jan Spaanderman
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Liam A. McDonnell
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
- Present Address: Department of Parasitology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Peter B. O’Connor
- Mass Spectrometry Resource, Department of Biochemistry, Boston University School of Medicine, Boston, MA USA
- Present Address: Department of Chemistry, University of Warwick, Coventry, UK
| | - Ron M. A. Heeren
- FOM Institute for Atomic and Molecular Physics, Science Park 104, 1098 XG Amsterdam, The Netherlands
| |
Collapse
|