1
|
Buzitis NW, Clowers BH. Development of a Modular, Open-Source, Reduced-Pressure, Drift Tube Ion Mobility Spectrometer. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2024; 35:804-813. [PMID: 38512132 DOI: 10.1021/jasms.4c00057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
Toward the goal of minimizing construction costs while maintaining high performance, a new, reduced-pressure, drift tube ion mobility system is coupled with an ion trap mass analyzer through a custom ion shuttle. The availability of reduced-pressure ion mobility systems remains limited due to comparatively expensive commercial options and limited shared design features in the open literature. This report details the complete design and benchmarking characteristics of a reduced-pressure ion mobility system. The system is constructed from FR4 PCB electrodes and encased in a PTFE vacuum enclosure with custom torque-tightened couplers to utilize standard KF40 bulkheads. The PTFE enclosure directly minimizes the overall system expenses, and the implementation of threaded brass inserts allows for facile attachments to the vacuum enclosure without damaging the thermoplastic housing. Front and rear ion funnels maximize ion transmission and help mitigate the effects of radial ion diffusion. A custom planar ion shuttle transports ions from the exit of the rear ion funnel into the ion optics of an ion trap mass analyzer. The planar ion shuttle can couple the IM system to any contemporary Thermo Scientific ion trap mass analyzer. Signal stability and ion intensity remain unchanging following the implementation of the planar ion shuttle when compared to the original stacked ring ion guide. The constructed IM system showed resolving powers up to 85 for various small molecules and proteins using the Fourier transform from a ∼1 m drift tube. Recorded mobilities derived from first principles agree with published literature results with an average error of 1.1% and an average error toward literature values using single field calibration of <1.3%.
Collapse
Affiliation(s)
- Nathan W Buzitis
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Brian H Clowers
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| |
Collapse
|
2
|
Capitain CC, Zischka M, Sirkeci C, Weller P. Evaluation of IMS drift tube temperature on the peak shape of high boiling fragrance compounds towards allergen detection in complex cosmetic products and essential oils. Talanta 2023; 257:124397. [PMID: 36858010 DOI: 10.1016/j.talanta.2023.124397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 02/26/2023]
Abstract
Gas chromatography-ion mobility spectrometry (GC-IMS) has recently gained increasing attention for the analysis of volatile compounds due to its high sensitivity, selectivity, and robust design. Peak shape distortion, including peak tailing or broadening, are well known challenges in chromatographic analysis that result in peak asymmetry and decreased resolution. However, in IMS analysis peak tailing, which is independent on the column separation technique, have also been observed. As high boiling substances, such as monoterpenes, are mainly affected by enlarged peak tailing in GC-IMS, we propose that condensation or adsorption effects within the "cold" IMS cell, which is commonly operated at 45 °C-90 °C, are the root cause. To avoid condensation and to decrease peak tailing, we used a prototypic high temperature ion mobility spectrometry (HTIMS) in this work, which allows an increase of the IMS drift tube temperature up to 180 °C. This HTIMS was coupled to a GC column separation and used to analyse the peak shape of homologues series of ketones, alcohols, aldehydes, as well as high boiling fragrance compounds, such as monoterpenes and phenylpropanoids. While we were able to show that an increased IMS drift tube temperatures correlates well with improved peak shapes, the GC parameters of the HS-GC-HTIMS method, however, were found to have little effect on the peak shapes in IMS spectra. In particular monoterpenes, which display intense peak tailing at lower IMS drift tube temperatures, show significant improvement of the peak shape at higher IMS drift tube temperatures. This leads to the assumption that high boiling substances indeed undergo condensation effects within the IMS cell at low drift tube temperatures. For many separation tasks, such as the separation of the phenylpropanoids eugenol and isoeugenol, comparably low IMS temperatures of 120 °C are already sufficient to achieve a resolution above 1.5. However, the optimal drift tube temperature is dependent on the substance class. While the aspect ratio increases steadily for most monoterpenes, phenylpropanoids and aldehyde monomer peaks investigated, an optimal aspect ratio was found for ketones between 140 °C and 160 °C and alcohols between 120 °C and 140 °C. Lastly, the change of the reduced mobility K0 with the increase of drift tube temperature was analysed. Compounds with similar chemical structure, such as the alcoholic monoterpenes citronellol and geraniol or the phenylpropanoids eugenol and isoeugenol show similar shifts of the K0 value. Substances which differ in their chemical structure, such as the aldehyde monoterpenes citral and cinnamal have substantially different shifts of the K0 value. With a future large substance database, the temperature dependant slope of the K0 value of a substance could be used to identify the substance groups of unknown molecules. Furthermore, substances with the same drift time but different chemical composition could be separable through a change in drift tube temperature.
Collapse
Affiliation(s)
- Charlotte C Capitain
- Institute for Instrumental Analytics and Bioanalytics, Mannheim University of Applied Sciences, 68163 Mannheim, Germany
| | - Martin Zischka
- Institute for Instrumental Analytics and Bioanalytics, Mannheim University of Applied Sciences, 68163 Mannheim, Germany
| | - Cengiz Sirkeci
- G.A.S. Gesellschaft für Analytische Sensorsysteme mbH, 44227 Dortmund, Germany
| | - Philipp Weller
- Institute for Instrumental Analytics and Bioanalytics, Mannheim University of Applied Sciences, 68163 Mannheim, Germany.
| |
Collapse
|
3
|
Ha NS, de Raad M, Han LZ, Golini A, Petzold CJ, Northen TR. Faster, better, and cheaper: harnessing microfluidics and mass spectrometry for biotechnology. RSC Chem Biol 2021; 2:1331-1351. [PMID: 34704041 PMCID: PMC8496484 DOI: 10.1039/d1cb00112d] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 07/01/2021] [Indexed: 12/14/2022] Open
Abstract
High-throughput screening technologies are widely used for elucidating biological activities. These typically require trade-offs in assay specificity and sensitivity to achieve higher throughput. Microfluidic approaches enable rapid manipulation of small volumes and have found a wide range of applications in biotechnology providing improved control of reaction conditions, faster assays, and reduced reagent consumption. The integration of mass spectrometry with microfluidics has the potential to create high-throughput, sensitivity, and specificity assays. This review introduces the widely-used mass spectrometry ionization techniques that have been successfully integrated with microfluidics approaches such as continuous-flow system, microchip electrophoresis, droplet microfluidics, digital microfluidics, centrifugal microfluidics, and paper microfluidics. In addition, we discuss recent applications of microfluidics integrated with mass spectrometry in single-cell analysis, compound screening, and the study of microorganisms. Lastly, we provide future outlooks towards online coupling, improving the sensitivity and integration of multi-omics into a single platform.
Collapse
Affiliation(s)
- Noel S Ha
- Biological Systems and Engineering, Lawrence Berkeley National Laboratory Berkeley CA USA
- US Department of Energy Joint BioEnergy Institute Emeryville CA USA
| | - Markus de Raad
- Environmental Genomics and Systems Biology, Biosciences, Lawrence Berkeley National Laboratory Berkeley CA USA
| | - La Zhen Han
- Environmental Genomics and Systems Biology, Biosciences, Lawrence Berkeley National Laboratory Berkeley CA USA
- US Department of Energy Joint Genome Institute Berkeley CA USA
| | - Amber Golini
- Environmental Genomics and Systems Biology, Biosciences, Lawrence Berkeley National Laboratory Berkeley CA USA
- US Department of Energy Joint Genome Institute Berkeley CA USA
| | - Christopher J Petzold
- Biological Systems and Engineering, Lawrence Berkeley National Laboratory Berkeley CA USA
- US Department of Energy Joint BioEnergy Institute Emeryville CA USA
| | - Trent R Northen
- Biological Systems and Engineering, Lawrence Berkeley National Laboratory Berkeley CA USA
- US Department of Energy Joint BioEnergy Institute Emeryville CA USA
- Environmental Genomics and Systems Biology, Biosciences, Lawrence Berkeley National Laboratory Berkeley CA USA
- US Department of Energy Joint Genome Institute Berkeley CA USA
| |
Collapse
|
4
|
Riches E, Palmer ME. Application of a novel cyclic ion mobility-mass spectrometer to the analysis of synthetic polymers: A preliminary evaluation. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34 Suppl 2:e8710. [PMID: 31856357 DOI: 10.1002/rcm.8710] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/10/2019] [Accepted: 12/18/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Mass spectrometry (MS) is often employed in the characterisation of synthetic polymers. As polymer architecture becomes more complex, ion mobility (IM) is increasingly being coupled with MS to provide an additional dimension of separation, along with structural information. In this study, we explore the use of a novel cyclic ion mobility (cIM) mass spectrometer for the analysis of a co-polymer sample. METHODS A solution of poly(ethylene glycol)-poly(propylene glycol) random co-polymer (PEG-ran-PPG) was used as a representative polymer sample. The solution was infused into a cIM-enabled quadrupole time-of-flight mass spectrometer. An m/z region of interest, selected using the quadrupole, was passed around the cIM device multiple times. Subsequently, regions of an arrival time distribution were 'sliced' and subjected to tandem mass spectrometric (MS/MS) analysis. RESULTS Typical, multiply charged series were observed for the polymer under electrospray ionisation. Multiple passes of the cIM device resulted in the separation of otherwise-overlapping charge states within a narrow m/z window (~3 m/z units), allowing individual selection of ions. These isolated ions were then subjected to post-mobility fragmentation resulting in clean, high-resolution product ion spectra, with a significant reduction in interference. CONCLUSIONS Scalable IM separation (IMS), brought about by passing ions multiple times around the cIM device, was demonstrated to provide increased IM resolution for ions in the selected m/z window. After multiple passes, deconvoluted high-resolution MS/MS product ion spectra were successfully acquired for ions that previously had interfering overlapping species present.
Collapse
|
5
|
Grabarics M, Lettow M, Kirk AT, von Helden G, Causon TJ, Pagel K. Plate-height model of ion mobility-mass spectrometry. Analyst 2020; 145:6313-6333. [DOI: 10.1039/d0an00433b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In analogy to chromatography, a plate-height model of drift tube ion mobility-mass spectrometry is presented that describes zone broadening and resolving power in ion mobility separations.
Collapse
Affiliation(s)
- Márkó Grabarics
- Department of Biology
- Chemistry and Pharmacy
- Institute of Chemistry and Biochemistry
- Freie Universität Berlin
- 14195 Berlin
| | - Maike Lettow
- Department of Biology
- Chemistry and Pharmacy
- Institute of Chemistry and Biochemistry
- Freie Universität Berlin
- 14195 Berlin
| | - Ansgar T. Kirk
- Institute of Electrical Engineering and Measurement Technology
- Department of Sensors and Measurement Technology
- Leibniz Universität Hannover
- 30167 Hannover
- Germany
| | - Gert von Helden
- Fritz Haber Institute of the Max Planck Society
- Department of Molecular Physics
- 14195 Berlin
- Germany
| | - Tim J. Causon
- Department of Chemistry
- Institute of Analytical Chemistry
- University of Natural Resources and Life Sciences
- Vienna
- 1190 Vienna
| | - Kevin Pagel
- Department of Biology
- Chemistry and Pharmacy
- Institute of Chemistry and Biochemistry
- Freie Universität Berlin
- 14195 Berlin
| |
Collapse
|
6
|
Pavlov J, Douce D, Bajic S, Attygalle AB. 1,4-Benzoquinone as a Highly Efficient Dopant for Enhanced Ionization and Detection of Nitramine Explosives on a Single-Quadrupole Mass Spectrometer Fitted with a Helium-Plasma Ionization (HePI) Source. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2704-2710. [PMID: 31673948 DOI: 10.1007/s13361-019-02339-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/04/2019] [Accepted: 09/09/2019] [Indexed: 06/10/2023]
Abstract
Previous investigations have evaluated the efficacy of anions such as NO3-, Cl-, Br-, CH3COO-, and CF3COO- as additives to generate or enhance mass spectrometric signals from explosives under plasma ionization conditions. The results of this study demonstrate that for detecting nitramine-class explosives, such as 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) and 1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane (HMX), 1,4-benzoquinone (BQ) is a highly effective and efficient dopant. When used in conjunction with ambient-pressure negative-ion helium-plasma ionization (HePI), 1,4-benzoquinone readily captures an electron, forming an abundant molecular anion (m/z 108), which upon exposure to vapors of RDX and HMX generates adduct ions of m/z 330 and 404, respectively. The signal level recorded for RDX upon adduction to the radical anion of 1,4-benzoquinone under our experimental conditions was significantly higher than that realized by chloride adduction using dichloromethane (DCM) as the dopant.
Collapse
Affiliation(s)
- Julius Pavlov
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, NJ, 07030, USA
| | | | | | - Athula B Attygalle
- Center for Mass Spectrometry, Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Hoboken, NJ, 07030, USA.
| |
Collapse
|
7
|
Izadi Z, Tabrizchi M, Borsdorf H, Farrokhpour H. Humidity Effect on the Drift Times of the Reactant Ions in Ion Mobility Spectrometry. Anal Chem 2019; 91:15932-15940. [DOI: 10.1021/acs.analchem.9b04450] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Zahra Izadi
- Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Mahmoud Tabrizchi
- Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, People’s Republic of China
| | - Helko Borsdorf
- UFZ-Helmholtz Centre for Environmental Research, Department Monitoring and Exploration Technologies, Permoserstraße 15, 04318 Leipzig, Germany
| | - Hossein Farrokhpour
- Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| |
Collapse
|
8
|
Hollerbach A, Fedick PW, Cooks RG. Ion Mobility–Mass Spectrometry Using a Dual-Gated 3D Printed Ion Mobility Spectrometer. Anal Chem 2018; 90:13265-13272. [PMID: 30281279 DOI: 10.1021/acs.analchem.8b02209] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Adam Hollerbach
- Chemistry Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Patrick W. Fedick
- Chemistry Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - R. Graham Cooks
- Chemistry Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| |
Collapse
|
9
|
Kirk AT, Grube D, Kobelt T, Wendt C, Zimmermann S. High-Resolution High Kinetic Energy Ion Mobility Spectrometer Based on a Low-Discrimination Tristate Ion Shutter. Anal Chem 2018; 90:5603-5611. [DOI: 10.1021/acs.analchem.7b04586] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Ansgar T. Kirk
- Institute of Electrical Engineering and
Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstrasse 9A, 30167 Hannover, Germany
| | - Denise Grube
- Institute of Electrical Engineering and
Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstrasse 9A, 30167 Hannover, Germany
| | - Tim Kobelt
- Institute of Electrical Engineering and
Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstrasse 9A, 30167 Hannover, Germany
| | - Cornelius Wendt
- Institute of Electrical Engineering and
Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstrasse 9A, 30167 Hannover, Germany
| | - Stefan Zimmermann
- Institute of Electrical Engineering and
Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstrasse 9A, 30167 Hannover, Germany
| |
Collapse
|
10
|
Pavlovich MJ, Musselman B, Hall AB. Direct analysis in real time-Mass spectrometry (DART-MS) in forensic and security applications. MASS SPECTROMETRY REVIEWS 2018; 37:171-187. [PMID: 27271453 DOI: 10.1002/mas.21509] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 04/28/2016] [Indexed: 05/10/2023]
Abstract
Over the last decade, direct analysis in real time (DART) has emerged as a viable method for fast, easy, and reliable "ambient ionization" for forensic analysis. The ability of DART to generate ions from chemicals that might be present at the scene of a criminal activity, whether they are in the gas, liquid, or solid phase, with limited sample preparation has made the technology a useful analytical tool in numerous forensic applications. This review paper summarizes many of those applications, ranging from the analysis of trace evidence to security applications, with a focus on providing the forensic scientist with a resource for developing their own applications. The most common uses for DART in forensics are in studying seized drugs, drugs of abuse and their metabolites, bulk and detonated explosives, toxic chemicals, chemical warfare agents, inks and dyes, and commercial plant and animal products that have been adulterated for economic gain. This review is meant to complement recent reviews that have described the fundamentals of the ionization mechanism and the general use of DART. We describe a wide range of forensic applications beyond the field of analyzing drugs of abuse, which dominates the literature, including common experimental and data analysis methods. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 37:171-187, 2018.
Collapse
Affiliation(s)
- Matthew J Pavlovich
- Department of Chemistry and Chemical Biology, Barnett Institute for Chemical and Biological Analysis, Northeastern University, Boston 02115, Massachusetts
| | | | - Adam B Hall
- Department of Chemistry and Chemical Biology, Barnett Institute for Chemical and Biological Analysis, Northeastern University, Boston 02115, Massachusetts
| |
Collapse
|
11
|
Hong Y, Liu S, Huang C, Xia L, Shen C, Jiang H, Chu Y. Simultaneous Improvement of Resolving Power and Signal-to-Noise Ratio Using a Modified Hadamard Transform-Inverse Ion Mobility Spectrometry Technique. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:2500-2507. [PMID: 28819725 DOI: 10.1007/s13361-017-1773-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/25/2017] [Accepted: 07/27/2017] [Indexed: 06/07/2023]
Abstract
In order to improve the resolving power (RP) and signal-to-noise ratio (SNR) of ion mobility spectrometry (IMS) simultaneously, a modified Hadamard transform-inverse ion mobility spectrometry (MHT-IIMS) technique was developed. In this novel technique, a series of isolating codes were appended to each element of the pseudo random binary sequence (PRBS), and then the modified modulation sequence was formed and used to control the ion gate of the inverse IMS (IIMS). Experimental results demonstrate that the MHT-IIMS technique can significantly enhance the resolving power and SNR simultaneously by measuring the spectra of reaction ions. Furthermore, the gas sample CCl4 and CHCl3 were measured for evaluating the capability of detecting those samples which have single and multiple product ions. The results show that this novel technique is able to simultaneously improve the resolving power and SNR notablely for the real sample detection without any significant instrumental changes. Graphical Abstract ᅟ.
Collapse
Affiliation(s)
- Yan Hong
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, Anhui, China
- School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, China
| | - Sheng Liu
- College of Computer Science and Technology, Huaibei Normal University, Huaibei, Anhui, 235000, China
| | - Chaoqun Huang
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, Anhui, China.
| | - Lei Xia
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, Anhui, China
| | - Chengyin Shen
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, Anhui, China
| | - Haihe Jiang
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, Anhui, China
| | - Yannan Chu
- Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, Anhui, China.
| |
Collapse
|
12
|
Hollerbach A, Baird Z, Cooks RG. Ion Separation in Air Using a Three-Dimensional Printed Ion Mobility Spectrometer. Anal Chem 2017; 89:5058-5065. [PMID: 28383249 DOI: 10.1021/acs.analchem.7b00469] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam Hollerbach
- Chemistry
Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | | | - R. Graham Cooks
- Chemistry
Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| |
Collapse
|
13
|
Tsai CW, Midey A, Wu C, Yost RA. Analysis of Ammonium Nitrate/Urea Nitrate with Crown Ethers and Sugars as Modifiers by Electrospray Ionization-Mass Spectrometry and Ion Mobility Spectrometry. Anal Chem 2016; 88:9435-9442. [DOI: 10.1021/acs.analchem.6b01322] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chia-Wei Tsai
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Anthony Midey
- Excellims Corporation, Acton, Massachusetts 01720, United States
| | - Ching Wu
- Excellims Corporation, Acton, Massachusetts 01720, United States
| | - Richard A. Yost
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| |
Collapse
|
14
|
Wang Y, Wang X, Li L, Chen C, Xu T, Wang T, Luo J. High pressure effects in high-field asymmetric waveform ion mobility spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1914-1922. [PMID: 27476664 DOI: 10.1002/rcm.7663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/30/2016] [Accepted: 06/13/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE High-Field Asymmetric Waveform Ion Mobility Spectrometry (FAIMS) is an analytical technique based on the principle of non-linear electric field dependence of coefficient of mobility of ions for separation that was originally conceived in the Soviet Union in the early 1980s. Being well developed over the past decades, FAIMS has become an efficient method for the separation and characterization of gas-phase ions at ambient pressure, often in air, to detect trace amounts of chemical species including explosives, toxic chemicals, chemical warfare agents and other compounds. However the resolution of FAIMS and ion separation capability need to be improved for more applications of the technique. METHODS The effects of above-ambient pressure varying from 1 to 3 atm on peak position, resolving power, peak width, and peak intensity are investigated theoretically and experimentally using micro-fabricated planar FAIMS in purified air. RESULTS Peak positions, varying with pressure in a way as a function of dispersion voltage, could be simplified by expressing both compensation and dispersion fields in Townsend units for E/N, the ratio of electric field intensity (E) to the gas number density (N). CONCLUSIONS It is demonstrated that ion Townsend-scale peak positions remain unchanged for a range of pressures investigated, implying that the higher the pressure is, stronger compensation and separation fields are needed within limits of air breakdown field. Increase in pressure is found to separate ions that could not be distinguished in ambient pressure, which could be interpreted as the differentials of ions' peak compensation voltage expanded wider than the dilation of peak widths leading to resolving power enhancement with pressure. Increase in pressure can also result in an increase in peak intensity.
Collapse
Affiliation(s)
- Yonghuan Wang
- Department of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Xiaozhi Wang
- Department of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Lingfen Li
- Suzhou Industrial Technology Research Institute of Zhejiang University, Suzhou, 215163, China
| | - Chilai Chen
- Chinese Academy of Sciences, Institute of Intelligent Machines, Hefei, Anhui, China
| | - Tianbai Xu
- Department of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Tao Wang
- Department of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Jikui Luo
- Department of Information Science & Electronic Engineering, Zhejiang University, Hangzhou, 310027, China
| |
Collapse
|
15
|
Garimella SVB, Ibrahim YM, Tang K, Webb IK, Baker ES, Tolmachev AV, Chen TC, Anderson GA, Smith RD. Spatial Ion Peak Compression and its Utility in Ion Mobility Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1128-35. [PMID: 27052738 PMCID: PMC4955798 DOI: 10.1007/s13361-016-1371-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 02/17/2016] [Accepted: 02/19/2016] [Indexed: 05/13/2023]
Abstract
A novel concept for ion spatial peak compression is described, and discussed primarily in the context of ion mobility spectrometry (IMS). Using theoretical and numerical methods, the effects of using non-constant (e.g., linearly varying) electric fields on ion distributions (e.g., an ion mobility peak) is evaluated both in the physical and temporal domains. The application of a linearly decreasing electric field in conjunction with conventional drift field arrangements is shown to lead to a reduction in IMS physical peak width. When multiple ion packets (i.e., peaks) in a selected mobility window are simultaneously subjected to such fields, there is ion packet compression (i.e., a reduction in peak widths for all species). This peak compression occurs with only a modest reduction of resolution, which can be quickly recovered as ions drift in a constant field after the compression event. Compression also yields a significant increase in peak intensities. Ion mobility peak compression can be particularly useful for mitigating diffusion-driven peak broadening over very long path length separations (e.g., in cyclic multi-pass arrangements), and for achieving higher S/N and IMS resolution over a selected mobility range. Graphical Abstract ᅟ.
Collapse
Affiliation(s)
- Sandilya V B Garimella
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Yehia M Ibrahim
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Keqi Tang
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Ian K Webb
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Erin S Baker
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Aleksey V Tolmachev
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Tsung-Chi Chen
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Gordon A Anderson
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Richard D Smith
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.
| |
Collapse
|
16
|
Chen LC, Ninomiya S, Hiraoka K. Super-atmospheric pressure ionization mass spectrometry and its application to ultrafast online protein digestion analysis. JOURNAL OF MASS SPECTROMETRY : JMS 2016; 51:396-411. [PMID: 27270863 DOI: 10.1002/jms.3779] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 04/15/2016] [Accepted: 04/20/2016] [Indexed: 06/06/2023]
Abstract
Ion source pressure plays a significant role in the process of ionization and the subsequent ion transmission inside a mass spectrometer. Pressurizing the ion source to a gas pressure greater than atmospheric pressure is a relatively new approach that aims to further improve the performance of atmospheric pressure ionization sources. For example, under a super-atmospheric pressure environment, a stable electrospray can be sustained for liquid with high surface tension such as pure water, because of the suppression of electric discharge. Even for nano-electrospray ionization (nano-ESI), which is known to work with aqueous solution, its stability and sensitivity can also be enhanced, particularly in the negative mode when the ion source is pressurized. A brief review on the development of super-atmospheric pressure ion sources, including high-pressure electrospray, field desorption and superheated ESI, and the strategies to interface these ion sources to a mass spectrometer will be given. Using a recent ESI prototype with an operating temperature at 220 °C under 27 atm, we also demonstrate that it is possible to achieve an online Asp-specific protein digestion analysis in which the whole processes of digestion, ionization and MS acquisition could be completed on the order of a few seconds. This method is fast, and the reaction can even be monitored on a near-real-time basis. Copyright © 2016 John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Lee Chuin Chen
- Graduate School, Department of Interdisciplinary Research, University of Yamanashi, 4-3-11, Takeda, Kofu, Yamanashi, 400-8511, Japan
| | - Satoshi Ninomiya
- Graduate School, Department of Interdisciplinary Research, University of Yamanashi, 4-3-11, Takeda, Kofu, Yamanashi, 400-8511, Japan
| | - Kenzo Hiraoka
- Clean Energy Research Center, University of Yamanashi, 4-3-11, Takeda, Kofu, Yamanashi, 400-8511, Japan
| |
Collapse
|
17
|
May JC, Dodds JN, Kurulugama RT, Stafford GC, Fjeldsted JC, McLean JA. Broadscale resolving power performance of a high precision uniform field ion mobility-mass spectrometer. Analyst 2015; 140:6824-33. [PMID: 26191544 PMCID: PMC4586486 DOI: 10.1039/c5an00923e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An extensive study of two current ion mobility resolving power theories ("conditional" and "semi-empirical") was undertaken using a recently developed drift tube ion mobility-mass spectrometer. The current study investigates the quantitative agreement between experiment and theory at reduced pressure (4 Torr) for a wide range of initial ion gate widths (100 to 500 μs), and ion mobility values (K0 from 0.50 to 3.0 cm(2) V(-1) s(-1)) representing measurements obtained in helium, nitrogen, and carbon dioxide drift gas. Results suggest that the conditional resolving power theory deviates from experimental results for low mobility ions (e.g., high mass analytes) and for initial ion gate widths beyond 200 μs. A semi-empirical resolving power theory provided close-correlation of predicted resolving powers to experimental results across the full range of mobilities and gate widths investigated. Interpreting the results from the semi-empirical theory, the performance of the current instrumentation was found to be highly linear for a wide range of analytes, with optimal resolving powers being accessible for a narrow range of drift fields between 14 and 17 V cm(-1). While developed using singly-charged ion mobility data, preliminary results suggest that the semi-empirical theory has broader applicability to higher-charge state systems.
Collapse
Affiliation(s)
- Jody C May
- Department of Chemistry, Center for Innovative Technology, Institute for Chemical Biology, Institute for Integrative Biosystems Research and Education, Vanderbilt University, Nashville, TN 37235-1822, USA.
| | | | | | | | | | | |
Collapse
|
18
|
Chen LC. When API Mass Spectrometry Meets Super Atmospheric Pressure Ion Sources. ACTA ACUST UNITED AC 2015; 4:A0041. [PMID: 26819912 DOI: 10.5702/massspectrometry.a0041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 06/03/2015] [Indexed: 11/23/2022]
Abstract
In a tutorial paper on the application of free-jet technique for API-MS, John Fenn mentioned that "…for a number of years and a number of reasons, it has been found advantageous in many situations to carry out the ionization process in gas at pressures up to 1000 Torr or more" (Int. J. Mass Spectrom. 200: 459-478, 2000). In fact, the first ESI mass spectrometer constructed by Yamashita and Fenn had a counter-flow curtain gas source at 1050 Torr (ca. 1.4 atm) to sweep away the neutral (J. Phys. Chem. 88: 4451-4459, 1984). For gaseous ionization using electrospray plume, theoretical analysis also shows that "super-atmospheric operation would be more preferable in space-charge-limited situations."(Int. J. Mass Spectrom. 300: 182-193, 2011). However, electrospray and the corona-based chemical ion source (APCI) in most commercial instrument are basically operated under an atmospheric pressure ambient, perhaps out of the concern of safety, convenience and simplicity in maintenance. Running the ion source at pressure much higher than 1 atm is not so common, but had been done by a number of groups as well as in our laboratory. A brief review on these ion sources will be given in this paper.
Collapse
Affiliation(s)
- Lee Chuin Chen
- Graduate School, Department of Interdisciplinary Research, University of Yamanashi
| |
Collapse
|
19
|
Cumeras R, Figueras E, Davis CE, Baumbach JI, Gràcia I. Review on ion mobility spectrometry. Part 2: hyphenated methods and effects of experimental parameters. Analyst 2015; 140:1391-410. [PMID: 25465248 PMCID: PMC4331244 DOI: 10.1039/c4an01101e] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ion Mobility Spectrometry (IMS) is a widely used and 'well-known' technique of ion separation in the gaseous phase based on the differences of ion mobilities under an electric field. This technique has received increased interest over the last several decades as evidenced by the pace and advances of new IMS devices available. In this review we explore the hyphenated techniques that are used with IMS, specifically mass spectrometry as an identification approach and a multi-capillary column as a pre-separation approach. Also, we will pay special attention to the key figures of merit of the ion mobility spectrum and how data sets are treated, and the influences of the experimental parameters on both conventional drift time IMS (DTIMS) and miniaturized IMS also known as high Field Asymmetric IMS (FAIMS) in the planar configuration. The present review article is preceded by a companion review article which details the current instrumentation and contains the sections that configure both conventional DTIMS and FAIMS devices. These reviews will give the reader an insightful view of the main characteristics and aspects of the IMS technique.
Collapse
Affiliation(s)
- R Cumeras
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Esfera UAB, Campus UAB s/n, E-08193 Bellaterra, Barcelona, Spain.
| | | | | | | | | |
Collapse
|
20
|
Cumeras R, Figueras E, Davis CE, Baumbach JI, Gràcia I. Review on ion mobility spectrometry. Part 1: current instrumentation. Analyst 2015; 140:1376-90. [PMID: 25465076 PMCID: PMC4331213 DOI: 10.1039/c4an01100g] [Citation(s) in RCA: 268] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ion Mobility Spectrometry (IMS) is a widely used and 'well-known' technique of ion separation in the gaseous phase based on the differences in ion mobilities under an electric field. All IMS instruments operate with an electric field that provides space separation, but some IMS instruments also operate with a drift gas flow that provides also a temporal separation. In this review we will summarize the current IMS instrumentation. IMS techniques have received an increased interest as new instrumentation and have become available to be coupled with mass spectrometry (MS). For each of the eight types of IMS instruments reviewed it is mentioned whether they can be hyphenated with MS and whether they are commercially available. Finally, out of the described devices, the six most-consolidated ones are compared. The current review article is followed by a companion review article which details the IMS hyphenated techniques (mainly gas chromatography and mass spectrometry) and the factors that make the data from an IMS device change as a function of device parameters and sampling conditions. These reviews will provide the reader with an insightful view of the main characteristics and aspects of the IMS technique.
Collapse
Affiliation(s)
- R Cumeras
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Esfera UAB, Campus UAB s/n, E-08193 Bellaterra, Barcelona, Spain.
| | | | | | | | | |
Collapse
|
21
|
Garimella SV, Ibrahim YM, Webb IK, Tolmachev AV, Zhang X, Prost SA, Anderson GA, Smith RD. Simulation of electric potentials and ion motion in planar electrode structures for lossless ion manipulations (SLIM). JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1890-6. [PMID: 25257188 PMCID: PMC4198429 DOI: 10.1007/s13361-014-0976-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 07/29/2014] [Accepted: 08/06/2014] [Indexed: 05/18/2023]
Abstract
We report a conceptual study and computational evaluation of novel planar electrode structures for lossless ion manipulations (SLIM). Planar electrode SLIM components were designed that allow for flexible ion confinement, transport, and storage using a combination of radio frequency (rf) and DC fields. Effective potentials can be generated that provide near ideal regions for confining and manipulating ions in the presence of a gas. Ion trajectory simulations using SIMION 8.1 demonstrated the capability for lossless ion motion in these devices over a wide m/z range and a range of electric fields at low pressures (e.g., a few Torr). More complex ion manipulations (e.g., turning ions by 90(o) and dynamically switching selected ion species into orthogonal channels) are also shown feasible. The performance of SLIM devices at ~4 Torr pressure for performing ion mobility-based separations (IMS) is computationally evaluated and compared with initial experimental results, and both are also shown to agree closely with experimental and theoretical IMS performance for a conventional drift tube design.
Collapse
|
22
|
Keelor JD, Dwivedi P, Fernández FM. An effective approach for coupling direct analysis in real time with atmospheric pressure drift tube ion mobility spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1538-1548. [PMID: 24903510 DOI: 10.1007/s13361-014-0926-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 05/06/2014] [Accepted: 05/06/2014] [Indexed: 06/03/2023]
Abstract
Drift tube ion mobility spectrometry (DTIMS) has evolved as a robust analytical platform routinely used for screening small molecules across a broad suite of chemistries ranging from food and pharmaceuticals to explosives and environmental toxins. Most modern atmospheric pressure IM detectors employ corona discharge, photoionization, radioactive, or electrospray ion sources for efficient ion production. Coupling standalone DTIMS with ambient plasma-based techniques, however, has proven to be an exceptional challenge. Device sensitivity with near-ground ambient plasma sources is hindered by poor ion transmission at the source-instrument interface, where ion repulsion is caused by the strong electric field barrier of the high potential ion mobility spectrometry (IMS) inlet. To overcome this shortfall, we introduce a new ion source design incorporating a repeller point electrode used to shape the electric field profile and enable ion transmission from a direct analysis in real time (DART) plasma ion source. Parameter space characterization studies of the DART DTIMS setup were performed to ascertain the optimal configuration for the source assembly favoring ion transport. Preliminary system capabilities for the direct screening of solid pharmaceuticals are briefly demonstrated.
Collapse
Affiliation(s)
- Joel D Keelor
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | | | | |
Collapse
|
23
|
Shliaha PV, Jukes-Jones R, Christoforou A, Fox J, Hughes C, Langridge J, Cain K, Lilley KS. Additional Precursor Purification in Isobaric Mass Tagging Experiments by Traveling Wave Ion Mobility Separation (TWIMS). J Proteome Res 2014; 13:3360-9. [DOI: 10.1021/pr500220g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Pavel V. Shliaha
- Cambridge
Centre for Proteomics, Department of Biochemistry, University of Cambridge, Cambridge, U.K
| | | | - Andy Christoforou
- Cambridge
Centre for Proteomics, Department of Biochemistry, University of Cambridge, Cambridge, U.K
| | - Jonathan Fox
- Waters Corporation,
HRMS, Stamford Avenue, Altrincham Road, Wilmslow, SK9 4AX, U.K
| | - Chris Hughes
- Waters Corporation,
HRMS, Stamford Avenue, Altrincham Road, Wilmslow, SK9 4AX, U.K
| | - James Langridge
- Waters Corporation,
HRMS, Stamford Avenue, Altrincham Road, Wilmslow, SK9 4AX, U.K
| | - Kelvin Cain
- MRC
Toxicology Unit, University of Leicester, Leicester, U.K
| | - Kathryn S. Lilley
- Cambridge
Centre for Proteomics, Department of Biochemistry, University of Cambridge, Cambridge, U.K
| |
Collapse
|
24
|
Mayer T, Borsdorf H. Accuracy of Ion Mobility Measurements Dependent on the Influence of Humidity. Anal Chem 2014; 86:5069-76. [DOI: 10.1021/ac5007393] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Thomas Mayer
- UFZ—Helmholtz Centre for Environmental Research Leipzig-Halle, Department Monitoring and Exploration Technologies, Permoserstraße 15, D-4318 Leipzig, Germany
| | - Helko Borsdorf
- UFZ—Helmholtz Centre for Environmental Research Leipzig-Halle, Department Monitoring and Exploration Technologies, Permoserstraße 15, D-4318 Leipzig, Germany
| |
Collapse
|
25
|
Chen LC, Rahman MM, Hiraoka K. Super-Atmospheric Pressure Ion Sources: Application and Coupling to API Mass Spectrometer. Mass Spectrom (Tokyo) 2014; 3:S0024. [PMID: 26819896 DOI: 10.5702/massspectrometry.s0024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 11/28/2013] [Indexed: 11/23/2022] Open
Abstract
Pressurizing the ionization source to gas pressure greater than atmospheric pressure is a new tactic aimed at further improving the performance of atmospheric pressure ionization (API) sources. In principle, all API sources, such as ESI, APCI and AP-MALDI, can be operated at pressure higher than 1 atm if suitable vacuum interface is available. The gas pressure in the ion source can have different role for different ionization. For example, in the case of ESI, stable electrospray could be sustained for high surface tension liquid (e.g., pure water) under super-atmospheric pressure, owing to the absence of electric discharge. Even for nanoESI, which is known to work well with aqueous solution, its stability and sensitivity were found to be enhanced, particularly in the negative mode when the ion source was pressurized. For the gas phase ionization like APCI, measurement of gaseous compound also showed an increase in ion intensity with the ion source pressure until an optimum pressure at around 4-5 atm. The enhancement was due to the increased collision frequency among reactant ion and analyte that promoted the ion/molecule reaction and a higher intake rate of gas to the mass spectrometer. Because the design of vacuum interface for API instrument is based on the upstream pressure of 1 atm, some coupling aspects need to be considered when connecting the high pressure ion source to the mass spectrometer. Several coupling strategies are discussed in this paper.
Collapse
Affiliation(s)
- Lee Chuin Chen
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | | | - Kenzo Hiraoka
- Clean Energy Research Center, University of Yamanashi
| |
Collapse
|
26
|
Shliaha PV, Bond NJ, Gatto L, Lilley KS. Effects of traveling wave ion mobility separation on data independent acquisition in proteomics studies. J Proteome Res 2013; 12:2323-39. [PMID: 23514362 DOI: 10.1021/pr300775k] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
qTOF mass spectrometry and traveling wave ion mobility separation (TWIMS) hybrid instruments (q-TWIMS-TOF) have recently become commercially available. Ion mobility separation allows an additional dimension of precursor separation inside the instrument, without incurring an increase in instrument time. We comprehensively investigated the effects of TWIMS on data-independent acquisition on a Synapt G2 instrument. We observed that if fragmentation is performed post TWIMS, more accurate assignment of fragment ions to precursors is possible in data independent acquisition. This allows up to 60% higher proteome coverage and higher confidence of protein and peptide identifications. Moreover, the majority of peptides and proteins identified upon application of TWIMS span the lower intensity range of the proteome. It has also been demonstrated in several studies that employing IMS results in higher peak capacity of separation and consequently more accurate and precise quantitation of lower intensity precursor ions. We observe that employing TWIMS results in an attenuation of the detected ion current. We postulate that this effect is binary; sensitivity is reduced due to ion scattering during transfer into a high pressure "IMS zone", sensitivity is reduced due to the saturation of detector digitizer as a result of the IMS concentration effect. This latter effect limits the useful linear range of quantitation, compromising quantitation accuracy of high intensity peptides. We demonstrate that the signal loss from detector saturation and transmission loss can be deconvoluted by investigation of the peptide isotopic envelope. We discuss the origin and extent of signal loss and suggest methods to minimize these effects on q-TWIMS-TOF instrument in the light of different experimental designs and other IMS/MS platforms described previously.
Collapse
Affiliation(s)
- Pavel V Shliaha
- Cambridge Centre for Proteomics, Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, United Kingdom
| | | | | | | |
Collapse
|
27
|
Chen LC, Rahman MM, Hiraoka K. Super-atmospheric pressure chemical ionization mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:392-398. [PMID: 23494797 DOI: 10.1002/jms.3173] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 01/09/2013] [Accepted: 01/17/2013] [Indexed: 06/01/2023]
Abstract
Super-atmospheric pressure chemical ionization (APCI) mass spectrometry was performed using a commercial mass spectrometer by pressurizing the ion source with compressed air up to 7 atm. Similar to typical APCI source, reactant ions in the experiment were generated with corona discharge using a needle electrode. Although a higher needle potential was necessary to initiate the corona discharge, discharge current and detected ion signal were stable at all tested pressures. A Roots booster pump with variable pumping speed was installed between the evacuation port of the mass spectrometer and the original rough pumps to maintain a same pressure in the first pumping stage of the mass spectrometer regardless of ion source pressure. Measurement of gaseous methamphetamine and research department explosive showed an increase in ion intensity with the ion source pressure until an optimum pressure at around 4-5 atm. Beyond 5 atm, the ion intensity decreased with further increase of pressure, likely due to greater ion losses inside the ion transport capillary. For benzene, it was found that besides molecular ion and protonated species, ion due to [M + 2H](+) which was not so common in APCI, was also observed with high ion abundance under super-atmospheric pressure condition.
Collapse
Affiliation(s)
- Lee Chuin Chen
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan.
| | | | | |
Collapse
|
28
|
Yang Z, Pavlov J, Attygalle AB. Quantification and remote detection of nitro explosives by helium plasma ionization mass spectrometry (HePI-MS) on a modified atmospheric pressure source designed for electrospray ionization. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:845-852. [PMID: 22791251 DOI: 10.1002/jms.3026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Helium Plasma Ionization (HePI) generates gaseous negative ions upon exposure of vapors emanating from organic nitro compounds. A simple adaptation converts any electrospray ionization source to a HePI source by passing helium through the sample delivery metal capillary held at a negative potential. Compared with the demands of other He-requiring ambient pressure ionization sources, the consumption of helium by the HePI source is minimal (20-30 ml/min). Quantification experiments conducted by exposing solid deposits to a HePI source revealed that 1 ng of 2,4,6-trinitrotoluene (TNT) on a filter paper (about 0.01 ng/mm(2)) could be detected by this method. When vapor emanating from a 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) sample was subjected to helium plasma ionization mass spectrometry (HePI-MS), a peak was observed at m/z 268 for (RDX●NO(2))(-). This facile formation of NO(2)(-) adducts was noted without the need of any extra additives as dopants. Quantitative evaluations showed RDX detection by HePI-MS to be linear over at least three orders of magnitude. TNT samples placed even 5 m away from the source were detected when the sample headspace vapor was swept by a stream of argon or nitrogen and delivered to the helium plasma ion source via a metal tube. Among the tubing materials investigated, stainless steel showed the best performance for sample delivery. A system with a copper tube, and air as the carrier gas, for example, failed to deliver any detectable amount of TNT to the source. In fact, passing over hot copper appears to be a practical way of removing TNT or other nitroaromatics from ambient air.
Collapse
Affiliation(s)
- Zhihua Yang
- Center for Mass Spectrometry, Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA
| | | | | |
Collapse
|
29
|
Davis EJ, Grows KF, Siems WF, Hill HH. Improved Ion Mobility Resolving Power with Increased Buffer Gas Pressure. Anal Chem 2012; 84:4858-65. [DOI: 10.1021/ac300452j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
30
|
Abstract
A novel analytical method, called Liquid Phase Ion Mobility Spectrometry (LiPIMS) was demonstrated, where aqueous phase analytes were ionized and introduced into non-aqueous liquids, transported by an external electric field from the point of generation to a collection electrode. Ions were produced from a unique liquid phase ionization process, called Electrodispersion Ionization. Spectra of analyte ions illustrated the potential of LiPIMS as a new separation technique. Experimental data showed that electrodispersion ionization was effective in generating nanoampere level of ion current in hexane and benzene from aqueous samples. By controlling the ionization voltage in relation to the sample flow rate, it was possible to operate the electrodispersion ionization source in both continuous and pulsed ionization modes. Unique LiPIMS spectra of aqueous samples of tetramethylammonium bromide, tetrabutylammonium bromide and bradykinin were presented and their respected liquid phase ion mobility values were determined.
Collapse
Affiliation(s)
- Maggie Tam
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA
| | | |
Collapse
|
31
|
Sabo M, Matejčík Š. Ion Mobility Spectrometry for Monitoring High-Purity Oxygen. Anal Chem 2011; 83:1985-9. [DOI: 10.1021/ac102687u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Martin Sabo
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F2, 842 48 Bratislava, Slovakia
| | - Štefan Matejčík
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F2, 842 48 Bratislava, Slovakia
| |
Collapse
|
32
|
Abstract
Ion mobility spectrometry (IMS) is a rapid, gas-phase separation technique that exhibits excellent separation of ions as a standalone instrument. However, IMS cannot achieve optimal separation power with both small and large ions simultaneously. Similar to the general elution problem in chromatography, fast ions are well resolved using a low electric field (50-150 V/cm), whereas slow drifting molecules are best separated using a higher electric field (250-500 V/cm). While using a low electric field, IMS systems tend to suffer from low ion transmission and low signal-to-noise ratios. Through the use a novel voltage algorithm, some of these effects can be alleviated. The electric field was swept from low to high while monitoring a specific drift time, and the resulting data were processed to create a 'voltage-sweep' spectrum. If an optimal drift time is calculated for each voltage and scanned simultaneously, a spectrum may be obtained with optimal separation throughout the mobility range. This increased the resolving power up to the theoretical maximum for every peak in the spectrum and extended the peak capacity of the IMS system, while maintaining accurate drift time measurements. These advantages may be extended to any IMS, requiring only a change in software.
Collapse
Affiliation(s)
- Eric J Davis
- Department of Chemistry, Washington State University, Pullman, Washington 99164, USA
| | | | | | | |
Collapse
|
33
|
Nilles JM, Connell TR, Stokes ST, Dupont Durst H. Explosives Detection Using Direct Analysis in Real Time (DART) Mass Spectrometry. PROPELLANTS EXPLOSIVES PYROTECHNICS 2010. [DOI: 10.1002/prep.200900084] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|