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Zhang YY, Senan AM, Wang T, Liu L, Voglmeir J. 1-(2-Aminoethyl)-3-methyl-1 H-imidazol-3-ium tetrafluoroborate: synthesis and application in carbohydrate analysis. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2019-0117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Reductive alkylation of the carbonyl group of carbohydrates with fluorescence or ionizing labels is a prerequisite for the sensitive analysis of carbohydrates by chromatographic and mass spectrometric techniques. Herein, 1-(2-aminoethyl)-3-methyl-1H-imidazol-3-ium tetrafluoroborate ([MIEA][BF4]) was successfully synthesized using tert-butyl N-(2-bromoethyl)carbamate and N-methylimidazole as starting materials. MIEA+ was then investigated as a multifunctional oligosaccharide label for glycan profiling and identification using LC-ESI-ToF and by MALDI-ToF mass spectrometry. The reductive amination of this diazole with carbohydrates was exemplified by labeling N-glycans from the model glycoproteins horseradish peroxidase, RNase B, and bovine lactoferrin. The produced MIEA+ glycan profiles were comparable to the corresponding 2AB labeled glycan derivatives and showed improved ESI-MS ionization efficiency over the respective 2AB derivatives, with detection sensitivity in the low picomol to the high femtomol range.
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Affiliation(s)
- Yao Y. Zhang
- Glycomics and Glycan Bioengineering Center , Nanjing Agricultural University , Nanjing , China
| | - Ahmed M. Senan
- Glycomics and Glycan Bioengineering Center , Nanjing Agricultural University , Nanjing , China
| | - Ting Wang
- Glycomics and Glycan Bioengineering Center , Nanjing Agricultural University , Nanjing , China
| | - Li Liu
- Glycomics and Glycan Bioengineering Center , Nanjing Agricultural University , Nanjing , China
| | - Josef Voglmeir
- Glycomics and Glycan Bioengineering Center , Nanjing Agricultural University , Nanjing , China
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Fujiwara Y, Saito N. Time-of-flight secondary ion mass spectrometry using a new primary ion beam generated by vacuum electrospray of a protic ionic liquid, propylammonium nitrate. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:1859-1867. [PMID: 28815824 DOI: 10.1002/rcm.7960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 08/10/2017] [Accepted: 08/13/2017] [Indexed: 06/07/2023]
Abstract
RATIONALE Protic ionic liquids have the potential to be useful materials for primary ion beams in terms of protonation, since they have active protons. Selecting protic ionic liquids suitable for primary ion beams is of great importance to increase molecular secondary ion yields. Propylammonium nitrate ([C3 H7 NH3 ][NO3 ]) seems promising in view of its proton affinity. It is likely that [C3 H7 NH3 ]+ cations can act as proton donors, and [NO3 ]- anions can work as proton acceptors. METHODS Time-of-flight secondary ion mass spectrometry (TOF-SIMS) experiments have been performed to verify the usefulness of [C3 H7 NH3 ][NO3 ]. A primary propylammonium nitrate cluster ion beam was generated by vacuum electrospray, and then used to analyze amino acids (arginine, glutamic acid, aspartic acid), angiotensin II and polyethylene glycol. Positive and negative secondary ion mass spectra were obtained to study both protonation and deprotonation. RESULTS The propylammonium nitrate cluster ion beam successfully generated protonated molecules [M + H]+ of all the analytes in positive ion mode. The primary ion beam also generated deprotonated molecules [M - H]- of glutamic acid, aspartic acid and angiotensin II in negative ion mode. Additionally, adduct ions related to [C3 H7 NH3 ][NO3 ] were detected in the case of arginine and polyethylene glycol. CONCLUSIONS The TOF-SIMS experiments confirmed that the propylammonium nitrate cluster ion beam was useful in generating molecular secondary ions, demonstrating that it is well suited for a primary ion beam in TOF-SIMS.
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Affiliation(s)
- Yukio Fujiwara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
| | - Naoaki Saito
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
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Ogrinc Potočnik N, Fisher GL, Prop A, Heeren RMA. Sequencing and Identification of Endogenous Neuropeptides with Matrix-Enhanced Secondary Ion Mass Spectrometry Tandem Mass Spectrometry. Anal Chem 2017; 89:8223-8227. [PMID: 28753276 PMCID: PMC5566790 DOI: 10.1021/acs.analchem.7b02573] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
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Matrix-enhanced
secondary ion mass spectrometry (ME-SIMS) has overcome
one of the biggest disadvantages of SIMS analysis by providing the
ability to detect intact biomolecules at high spatial resolution.
By increasing ionization efficiency and minimizing primary ion beam-induced
fragmentation of analytes, ME-SIMS has proven useful for detection
of numerous biorelevant species, now including peptides. We report
here the first demonstration of tandem ME-SIMS for de novo sequencing
of endogenous neuropeptides from tissue in situ (i.e., rat pituitary
gland). The peptide ions were isolated for tandem MS analysis using
a 1 Da mass isolation window, followed by collision-induced dissociation
(CID) at 1.5 keV in a collision cell filled with argon gas, for confident
identification of the detected peptide. Using this method, neuropeptides
up to m/z 2000 were detected and
sequenced from the posterior lobe of the rat pituitary gland. These
results demonstrate the potential for ME-SIMS tandem MS development
in bottom-up proteomics imaging at high-spatial resolution.
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Affiliation(s)
- Nina Ogrinc Potočnik
- Maastricht MultiModal Molecular Imaging (M4I) Institute, Division of Imaging Mass Spectrometry, Maastricht University , Maastricht, 6229 ER, The Netherlands
| | - Gregory L Fisher
- Physical Electronics Inc. , Chanhassen, Minnesota 55317, United States
| | - Arnoud Prop
- Maastricht MultiModal Molecular Imaging (M4I) Institute, Division of Imaging Mass Spectrometry, Maastricht University , Maastricht, 6229 ER, The Netherlands
| | - Ron M A Heeren
- Maastricht MultiModal Molecular Imaging (M4I) Institute, Division of Imaging Mass Spectrometry, Maastricht University , Maastricht, 6229 ER, The Netherlands
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Organic matrices, ionic liquids, and organic matrices@nanoparticles assisted laser desorption/ionization mass spectrometry. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.01.012] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Comi TJ, Do TD, Rubakhin SS, Sweedler JV. Categorizing Cells on the Basis of their Chemical Profiles: Progress in Single-Cell Mass Spectrometry. J Am Chem Soc 2017; 139:3920-3929. [PMID: 28135079 PMCID: PMC5364434 DOI: 10.1021/jacs.6b12822] [Citation(s) in RCA: 138] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Indexed: 02/06/2023]
Abstract
The chemical differences between individual cells within large cellular populations provide unique information on organisms' homeostasis and the development of diseased states. Even genetically identical cell lineages diverge due to local microenvironments and stochastic processes. The minute sample volumes and low abundance of some constituents in cells hinder our understanding of cellular heterogeneity. Although amplification methods facilitate single-cell genomics and transcriptomics, the characterization of metabolites and proteins remains challenging both because of the lack of effective amplification approaches and the wide diversity in cellular constituents. Mass spectrometry has become an enabling technology for the investigation of individual cellular metabolite profiles with its exquisite sensitivity, large dynamic range, and ability to characterize hundreds to thousands of compounds. While advances in instrumentation have improved figures of merit, acquiring measurements at high throughput and sampling from large populations of cells are still not routine. In this Perspective, we highlight the current trends and progress in mass-spectrometry-based analysis of single cells, with a focus on the technologies that will enable the next generation of single-cell measurements.
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Affiliation(s)
- Troy J. Comi
- Department of Chemistry and
the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Thanh D. Do
- Department of Chemistry and
the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Stanislav S. Rubakhin
- Department of Chemistry and
the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Jonathan V. Sweedler
- Department of Chemistry and
the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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Do TD, Comi TJ, Dunham SJB, Rubakhin SS, Sweedler JV. Single Cell Profiling Using Ionic Liquid Matrix-Enhanced Secondary Ion Mass Spectrometry for Neuronal Cell Type Differentiation. Anal Chem 2017; 89:3078-3086. [PMID: 28194949 DOI: 10.1021/acs.analchem.6b04819] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A high-throughput single cell profiling method has been developed for matrix-enhanced-secondary ion mass spectrometry (ME-SIMS) to investigate the lipid profiles of neuronal cells. Populations of cells are dispersed onto the substrate, their locations determined using optical microscopy, and the cell locations used to guide the acquisition of SIMS spectra from the cells. Up to 2,000 cells can be assayed in one experiment at a rate of 6 s per cell. Multiple saturated and unsaturated phosphatidylcholines (PCs) and their fragments are detected and verified with tandem mass spectrometry from individual cells when ionic liquids are employed as a matrix. Optically guided single cell profiling with ME-SIMS is suitable for a range of cell sizes, from Aplysia californica neurons larger than 75 μm to 7-μm rat cerebellar neurons. ME-SIMS analysis followed by t-distributed stochastic neighbor embedding of peaks in the lipid molecular mass range (m/z 700-850) distinguishes several cell types from the rat central nervous system, largely based on the relative proportions of four dominant lipids, PC(32:0), PC(34:1), PC(36:1), and PC(38:5). Furthermore, subpopulations within each cell type are tentatively classified consistent with their endogenous lipid ratios. The results illustrate the efficacy of a new approach to classify single cell populations and subpopulations using SIMS profiling of lipid and metabolite contents. These methods are broadly applicable for high throughput single cell chemical analyses.
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Affiliation(s)
- Thanh D Do
- Department of Chemistry and the Beckman Institute, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Troy J Comi
- Department of Chemistry and the Beckman Institute, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Sage J B Dunham
- Department of Chemistry and the Beckman Institute, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Stanislav S Rubakhin
- Department of Chemistry and the Beckman Institute, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Jonathan V Sweedler
- Department of Chemistry and the Beckman Institute, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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Zhou Y, Yao J, Ding Y, Yu J, Hua X, Evans JE, Yu X, Lao DB, Heldebrant DJ, Nune SK, Cao B, Bowden ME, Yu XY, Wang XL, Zhu Z. Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:2006-2013. [PMID: 27600576 DOI: 10.1007/s13361-016-1478-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 08/08/2016] [Accepted: 08/10/2016] [Indexed: 06/06/2023]
Abstract
In situ liquid secondary ion mass spectrometry (SIMS) enabled by system for analysis at the liquid vacuum interface (SALVI) has proven to be a promising new tool to provide molecular information at solid-liquid and liquid-vacuum interfaces. However, the initial data showed that useful signals in positive ion spectra are too weak to be meaningful in most cases. In addition, it is difficult to obtain strong negative molecular ion signals when m/z>200. These two drawbacks have been the biggest obstacle towards practical use of this new analytical approach. In this study, we report that strong and reliable positive and negative molecular signals are achievable after optimizing the SIMS experimental conditions. Four model systems, including a 1,8-diazabicycloundec-7-ene (DBU)-base switchable ionic liquid, a live Shewanella oneidensis biofilm, a hydrated mammalian epithelia cell, and an electrolyte popularly used in Li ion batteries were studied. A signal enhancement of about two orders of magnitude was obtained in comparison with non-optimized conditions. Therefore, molecular ion signal intensity has become very acceptable for use of in situ liquid SIMS to study solid-liquid and liquid-vacuum interfaces. Graphical Abstract ᅟ.
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Affiliation(s)
- Yufan Zhou
- School of Physics, State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan, 250100, China
- W. R. Wiley Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Juan Yao
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Yuanzhao Ding
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
- School of Civil and Environmental Engineering and Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Jiachao Yu
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Xin Hua
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - James E Evans
- W. R. Wiley Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Xiaofei Yu
- School of Physics, State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan, 250100, China
- W. R. Wiley Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - David B Lao
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - David J Heldebrant
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Satish K Nune
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Bin Cao
- School of Civil and Environmental Engineering and Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Mark E Bowden
- W. R. Wiley Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Xiao-Ying Yu
- Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
| | - Xue-Lin Wang
- School of Physics, State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan, 250100, China.
| | - Zihua Zhu
- W. R. Wiley Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
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8
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Shen K, Tarolli JG, Winograd N. Cluster secondary ion mass spectrometry imaging of interfacial reactions of TiO2 microspheres embedded in ionic liquids. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:379-385. [PMID: 26754130 DOI: 10.1002/rcm.7447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 10/01/2015] [Accepted: 11/02/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE Our goal is to develop protocols for the elucidation of the identity and structure of reaction products embedded in a reaction medium. Results should find significance in a variety of disciplines ranging from the study of biological cells and tissues, to the steps associated with the functionalization of nanoparticles. METHODS We utilize cluster secondary ion mass spectrometry (cluster-SIMS) to acquire three-dimensional (3D) information about 5-30 µm TiO2 microspheres imbedded into an ionic liquid. The method allows molecular depth profiling with submicron spatial resolution and depth profiling with a resolution of several tens of nanometers. The ionic liquid matrix enshrouds the spheres, allowing them to be introduced into the vacuum environment of the mass spectrometer. RESULTS The results provide 3D chemical information about these microspheres as they are synthesized by interfacial sol-gel reactions. We show that with 40 keV C60 (+) , it is possible to erode through the reaction medium and map the distribution of those embedded TiO2 microspheres. Moreover, we demonstrate that it is possible to monitor surface modification of the particles and, via ion beam drilling, elucidate their internal structure. CONCLUSIONS Using cluster-SIMS imaging, we are able to elucidate the identity and structure of reaction products embedded in a reaction medium, a problem of long-standing interest for materials characterization. With this strategy, we have provided a new approach that may be especially useful for the characterization of biological tissue and cells within the vacuum confines of the mass spectrometer. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- Kan Shen
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Jay G Tarolli
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Nicholas Winograd
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
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9
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Fujiwara Y, Saito N. Effects of a proton-conducting ionic liquid on secondary ion formation in time-of-flight secondary ion mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:239-249. [PMID: 26661991 DOI: 10.1002/rcm.7439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 10/16/2015] [Accepted: 10/25/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE A protic ionic liquid, diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]), has low vapor pressure and high protonic conductivity even at room temperature. Since [dema][TfO] has a mobile proton in its salt structure, its primary beam is expected to enhance the formation of protonated molecular ions. However, mass spectrometric characteristics of [dema][TfO] are not well known. In order to develop an ionic-liquid primary beam source, it is necessary to investigate such characteristics. METHODS The first time-of-flight secondary ion mass spectrometry (TOF-SIMS) experiment using an Ar(+) primary ion beam was performed to analyze two samples: a neat [dema][TfO] sample and a mixed sample of arginine and [dema][TfO]. Beam characteristics of [dema][TfO] generated by vacuum electrospray were investigated using an apparatus for measuring transient responses of a beam current. The second TOF-SIMS experiment using a [dema][TfO] primary beam was performed to analyze three samples: arginine, a mixture of arginine and [dema][TfO], and poly(ethylene glycol) (PEG300). RESULTS The [dema][TfO] primary beam was useful in generating protonated arginine; however, it was not helpful in detecting PEG300. The results were explained by considering gas-phase basicities and proton affinities of analytes and [dema][TfO] constituents. Projectile energy per nucleon of the [dema][TfO] beam was examined; it would be necessary to reduce m/z values of ionic-liquid charged droplets. In addition, a screening method was proposed to select ionic liquids suitable for primary ion beams. CONCLUSIONS Since [dema][TfO] can act as a proton source, its primary beam can effectively generate protonated secondary ions of analytes. Consequently, proton-conducting ionic liquids such as [dema][TfO] are expected to have great potentials as primary ion beams in TOF-SIMS.
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Affiliation(s)
- Yukio Fujiwara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
| | - Naoaki Saito
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
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10
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Kazarjan J, Vaher M, Hunter T, Kulp M, Hunter GJ, Bonetta R, Farrugia D, Kaljurand M. Determination of metal content in superoxide dismutase enzymes by capillary electrophoresis†. J Sep Sci 2015; 38:1042-5. [DOI: 10.1002/jssc.201400925] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 12/23/2014] [Accepted: 12/26/2014] [Indexed: 01/28/2023]
Affiliation(s)
- Jana Kazarjan
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
| | - Merike Vaher
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
| | - Thérèse Hunter
- Department of Physiology and Biochemistry; University of Malta; Msida Malta
| | - Maria Kulp
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
| | - Gary James Hunter
- Department of Physiology and Biochemistry; University of Malta; Msida Malta
| | - Rosalin Bonetta
- Department of Physiology and Biochemistry; University of Malta; Msida Malta
| | - Diane Farrugia
- Department of Physiology and Biochemistry; University of Malta; Msida Malta
| | - Mihkel Kaljurand
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
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Dertinger JJ, Walker AV. Ionic liquid matrices for improved detection of proteins and polymers in time-of-flight secondary ion mass spectrometry. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5622] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jennifer J. Dertinger
- Department of Materials Science and Engineering, RL 10; University of Texas at Dallas; 800 W. Campbell Rd Richardson TX 75080 USA
| | - Amy V. Walker
- Department of Materials Science and Engineering, RL 10; University of Texas at Dallas; 800 W. Campbell Rd Richardson TX 75080 USA
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12
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Fujiwara Y, Saito N. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) using an ionic-liquid primary ion beam source. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5662] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yukio Fujiwara
- National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 2, 1-1-1 Umezono Tsukuba-shi Ibaraki-ken 305-8568 Japan
| | - Naoaki Saito
- National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 2, 1-1-1 Umezono Tsukuba-shi Ibaraki-ken 305-8568 Japan
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13
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Abdelhamid HN, Khan MS, Wu HF. Design, characterization and applications of new ionic liquid matrices for multifunctional analysis of biomolecules: A novel strategy for pathogenic bacteria biosensing. Anal Chim Acta 2014; 823:51-60. [DOI: 10.1016/j.aca.2014.03.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 03/16/2014] [Accepted: 03/19/2014] [Indexed: 01/01/2023]
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14
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Ho TD, Zhang C, Hantao LW, Anderson JL. Ionic liquids in analytical chemistry: fundamentals, advances, and perspectives. Anal Chem 2013; 86:262-85. [PMID: 24205989 DOI: 10.1021/ac4035554] [Citation(s) in RCA: 374] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tien D Ho
- Department of Chemistry, The University of Toledo , Toledo, Ohio 43606, United States
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15
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Dertinger JJ, Walker AV. Towards the rational design of ionic liquid matrices for secondary ion mass spectrometry: role of the anion. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:1288-1295. [PMID: 23722728 DOI: 10.1007/s13361-013-0666-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 04/23/2013] [Accepted: 05/05/2013] [Indexed: 06/02/2023]
Abstract
The role of the ionic liquid (IL) anion structure on analyte signal enhancements has been systematically investigated in secondary ion mass spectrometry (SIMS) using a variety of samples, including lipids, sterols, polymers, and peptides. Twenty-four ILs were synthesized. The 12 matrix acids were cinnamic acid derivatives. Two bases were employed: 1-methylimidazole and tripropylamine. Three matrices, methylimmidazolium o-coumarate, tripropylammonium o-coumarate, and tripropylammonium 3,4,5-trimethoxycinnamate, were "universal" matrices enhancing all analytes tested. The pKa of the matrix acid does not appear to have a strong effect on analyte ion intensities. Rather, it is observed that a single hydroxyl group on the anion aromatic ring leads to significantly increased molecular ion intensities. No analyte signal enhancements were observed for -CH3, -CF3 and -OCH3 groups present on the aromatic ring. The position of the -OH group on the aromatic ring also alters molecular ion intensity enhancements. As well as the chemical identity and position of substituents, the number of moieties on the aromatic ring may affect the analyte signal enhancements observed. These observations suggest that the activation of the IL anion aromatic ring is important for optimizing analyte signal intensities. The implications for SIMS imaging of complex structures, such as biological samples, are discussed.
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Affiliation(s)
- Jennifer J Dertinger
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
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