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Christofi E, Barran P. Ion Mobility Mass Spectrometry (IM-MS) for Structural Biology: Insights Gained by Measuring Mass, Charge, and Collision Cross Section. Chem Rev 2023; 123:2902-2949. [PMID: 36827511 PMCID: PMC10037255 DOI: 10.1021/acs.chemrev.2c00600] [Citation(s) in RCA: 43] [Impact Index Per Article: 43.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Indexed: 02/26/2023]
Abstract
The investigation of macromolecular biomolecules with ion mobility mass spectrometry (IM-MS) techniques has provided substantial insights into the field of structural biology over the past two decades. An IM-MS workflow applied to a given target analyte provides mass, charge, and conformation, and all three of these can be used to discern structural information. While mass and charge are determined in mass spectrometry (MS), it is the addition of ion mobility that enables the separation of isomeric and isobaric ions and the direct elucidation of conformation, which has reaped huge benefits for structural biology. In this review, where we focus on the analysis of proteins and their complexes, we outline the typical features of an IM-MS experiment from the preparation of samples, the creation of ions, and their separation in different mobility and mass spectrometers. We describe the interpretation of ion mobility data in terms of protein conformation and how the data can be compared with data from other sources with the use of computational tools. The benefit of coupling mobility analysis to activation via collisions with gas or surfaces or photons photoactivation is detailed with reference to recent examples. And finally, we focus on insights afforded by IM-MS experiments when applied to the study of conformationally dynamic and intrinsically disordered proteins.
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Affiliation(s)
- Emilia Christofi
- Michael Barber Centre for Collaborative
Mass Spectrometry, Manchester Institute of Biotechnology, University of Manchester, Princess Street, Manchester M1 7DN, United Kingdom
| | - Perdita Barran
- Michael Barber Centre for Collaborative
Mass Spectrometry, Manchester Institute of Biotechnology, University of Manchester, Princess Street, Manchester M1 7DN, United Kingdom
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Braathen MR, Rimstad I, Dybvik T, Nygård S, Ræder J. Online exhaled propofol monitoring in normal-weight and obese surgical patients. Acta Anaesthesiol Scand 2022; 66:598-605. [PMID: 35138633 PMCID: PMC9305953 DOI: 10.1111/aas.14043] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 01/20/2022] [Accepted: 02/03/2022] [Indexed: 12/27/2022]
Abstract
Background Ion mobility spectrometry (IMS) allows for online quantification of exhaled propofol concentrations. We aimed to validate a bedside online IMS device, the Edmon®, for predicting plasma concentrations of propofol in normal‐weight and obese patients. Methods Patients with body mass index (BMI) >20 kg/m2 scheduled for laparoscopic cholecystectomy or bariatric surgery were recruited. Exhaled propofol concentrations (CA), arterial plasma propofol concentrations (CP) and bispectral index (BIS) values were collected during target‐controlled infusion (TCI) anaesthesia. Generalised estimation equation (GEE) was applied to all samples and stable‐phase samples at different delays for best fit between CP and CA. BMI was evaluated as covariate. BIS and exhaled propofol correlations were also assessed with GEE. Results A total of 29 patients (BMI 20.3–53.7) were included. A maximal R2 of 0.58 was found during stable concentrations with 5 min delay of CA to CP; the intercept a = −0.69 (95% CI −1.7, 0.3) and slope b = 0.87 (95% CI 0.7, 1.1). BMI was found to be a non‐significant covariate. The median absolute performance error predicting plasma propofol concentrations was 13.4%. At a CA of 5 ppb, the model predicts a CP of 3.6 μg/ml (95% CI ±1.4). There was a maximal negative correlation of R2 = 0.44 at 2‐min delay from CA to BIS. Conclusions Online monitoring of exhaled propofol concentrations is clinically feasible in normal‐weight and obese patients. With a 5‐min delay, our model outperforms the Marsh plasma TCI model in a post hoc analysis. Modest correlation with plasma concentrations makes the clinical usefulness questionable.
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Affiliation(s)
- Martin R. Braathen
- Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
- Department of Anaesthesiology Division of Critical Care Oslo University Hospital Oslo Norway
| | - Ivan Rimstad
- Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
- Department of Anaesthesiology Division of Critical Care Oslo University Hospital Oslo Norway
| | - Terje Dybvik
- Department of Anaesthesiology Division of Critical Care Oslo University Hospital Oslo Norway
| | - Ståle Nygård
- Department of Informatics Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
- Department of Biostatistics Institute of Basic Medical Sciences Oslo Centre for Biostatistics and Epidemiology University of Oslo Oslo Norway
| | - Johan Ræder
- Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
- Department of Anaesthesiology Division of Critical Care Oslo University Hospital Oslo Norway
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Vautz W, Seifert L, Mohammadi M, Klinkenberg IAG, Liedtke S. Detection of axillary perspiration metabolites using ion mobility spectrometry coupled to rapid gas chromatography. Anal Bioanal Chem 2019; 412:223-232. [PMID: 31836923 DOI: 10.1007/s00216-019-02262-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 10/11/2019] [Accepted: 11/06/2019] [Indexed: 11/30/2022]
Abstract
The composition of human sweat-and as a consequence the composition of volatiles released from human skin-strongly depends on genetic preconditions, diet, stress, personal hygiene but also on health status and medication. Accordingly, the composition is a carrier of information on the physical and mental states of a person. Therefore, rapid on-site analysis of the relevant substances may be used for medical diagnosis and medication control or even for psychological characterisation. Ion mobility spectrometry coupled to rapid gas chromatography (GC-IMS) was applied to the analysis of human axillary sweat as a sensitive, selective, rapid, and non-invasive method in a feasibility study. For this purpose, a sampling chamber was designed and manufactured. The design and the experimental setup were validated successfully. At least 179 human metabolites could be detected by GC-IMS from the skin of 7 volunteers. Fifteen metabolites were available in all samples from all volunteers and therefore can be characterised as basic sweat compounds which might enable the localisation of hidden persons. Furthermore, in a preliminary feasibility study, the potential of GC-IMS for differentiating the composition of sweat after physical exercises and in a stressful situation-even gender specific-could be demonstrated. Thus, with GC-IMS, a rapid and mobile analytical tool for the analysis of skin volatiles is available for a broad range of applications, e.g. with regard to axillary odour, human health, nutrition, consumption of remedies or drugs of abuse, the localisation of trapped or hidden persons, or even the characterisation of the reaction on stressful situations. Graphical abstract.
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Affiliation(s)
- Wolfgang Vautz
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Bunsen-Kirchhoff-Straße 11, 44139, Dortmund, Germany. .,ION-GAS GmbH, Konrad-Adenauer-Allee 11, 44263, Dortmund, Germany.
| | - Luzia Seifert
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Bunsen-Kirchhoff-Straße 11, 44139, Dortmund, Germany
| | - Marziyeh Mohammadi
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Bunsen-Kirchhoff-Straße 11, 44139, Dortmund, Germany
| | - Isabelle A G Klinkenberg
- Institute of Biomagnetism and Biosignalanalysis, Medical Faculty, University of Muenster, Malmedyweg 15, 48149, Münster, Germany.,Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Muenster, Münster, Germany
| | - Sascha Liedtke
- ION-GAS GmbH, Konrad-Adenauer-Allee 11, 44263, Dortmund, Germany
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Vautz W, Franzke J, Zampolli S, Elmi I, Liedtke S. On the potential of ion mobility spectrometry coupled to GC pre-separation – A tutorial. Anal Chim Acta 2018; 1024:52-64. [DOI: 10.1016/j.aca.2018.02.052] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 02/16/2018] [Accepted: 02/19/2018] [Indexed: 12/14/2022]
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Bergen I, Liedtke S, Güssgen S, Kayser O, Hariharan C, Drees C, Vautz W. Calibration of complex mixtures in one sweep. ACTA ACUST UNITED AC 2018. [DOI: 10.1007/s12127-018-0236-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Vautz W, Hariharan C, Weigend M. Smell the change: On the potential of gas-chromatographic ion mobility spectrometry in ecosystem monitoring. Ecol Evol 2018; 8:4370-4377. [PMID: 29760879 PMCID: PMC5938450 DOI: 10.1002/ece3.3990] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 01/23/2018] [Accepted: 02/09/2018] [Indexed: 01/20/2023] Open
Abstract
Plant volatile organic compounds (pVOCs) are being recognized as an important factor in plant–environment interactions. Both the type and amount of the emissions appear to be heavily affected by climate change. A range of studies therefore has been directed toward understanding pVOC emissions, mostly under laboratory conditions (branch/leaf enclosure). However, there is a lack of rapid, sensitive, and selective analytical methods, and therefore, only little is known about VOC emissions under natural, outdoor conditions. An increased sensitivity and the identification of taxon‐specific patterns could turn VOC analysis into a powerful tool for the monitoring of atmospheric chemistry, ecosystems, and biodiversity, with far‐reaching relevance to the impact of climate change on pVOCs and vice versa. This study for the first time investigates the potential of ion mobility spectrometry coupled to gas‐chromatographic preseparation (GC‐IMS) to dramatically increase sensitivity and selectivity for continuous monitoring of pVOCs and to discriminate contributing plant taxa and their phenology. Leaf volatiles were analyzed for nine different common herbaceous plants from Germany. Each plant turned out to have a characteristic metabolite pattern. pVOC patterns in the field would thus reflect the composition of the vegetation, but also phenology (with herbaceous and deciduous plants contributing according to season). The technique investigated here simultaneously enables the identification and quantification of substances characteristic for environmental pollution such as industrial and traffic emissions or pesticides. GC‐IMS thus has an enormous potential to provide a broad range of data on ecosystem function. This approach with near‐continues measurements in the real plant communities could provide crucial insights on pVOC‐level emissions and their relation to climate and phenology and thus provide a sound basis for modeling climate change scenarios including pVOC emissions.
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Affiliation(s)
- Wolfgang Vautz
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. Dortmund Germany.,ION-GAS GmbH Dortmund Germany
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Abstract
While yeast is one of the most studied organisms, its intricate biology remains to be fully mapped and understood. This is especially the case when it comes to capture rapid, in vivo fluctuations of metabolite levels. Secondary electrospray ionization-high resolution mass spectrometry SESI-HRMS is introduced here as a sensitive and noninvasive analytical technique for online monitoring of microbial metabolic activity. The power of this technique is exemplarily shown for baker’s yeast fermentation, for which the time-resolved abundance of about 300 metabolites is demonstrated. The results suggest that a large number of metabolites produced by yeast from glucose neither are reported in the literature nor are their biochemical origins deciphered. With the technique demonstrated here, researchers interested in distant disciplines such as yeast physiology and food quality will gain new insights into the biochemical capability of this simple eukaryote.
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Resolution-optimized headspace gas chromatography-ion mobility spectrometry (HS-GC-IMS) for non-targeted olive oil profiling. Anal Bioanal Chem 2017; 409:3933-3942. [DOI: 10.1007/s00216-017-0338-2] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 03/11/2017] [Accepted: 03/23/2017] [Indexed: 02/01/2023]
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Giannoukos S, Brkić B, Taylor S, Marshall A, Verbeck GF. Chemical Sniffing Instrumentation for Security Applications. Chem Rev 2016; 116:8146-72. [PMID: 27388215 DOI: 10.1021/acs.chemrev.6b00065] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Border control for homeland security faces major challenges worldwide due to chemical threats from national and/or international terrorism as well as organized crime. A wide range of technologies and systems with threat detection and monitoring capabilities has emerged to identify the chemical footprint associated with these illegal activities. This review paper investigates artificial sniffing technologies used as chemical sensors for point-of-use chemical analysis, especially during border security applications. This article presents an overview of (a) the existing available technologies reported in the scientific literature for threat screening, (b) commercially available, portable (hand-held and stand-off) chemical detection systems, and (c) their underlying functional and operational principles. Emphasis is given to technologies that have been developed for in-field security operations, but laboratory developed techniques are also summarized as emerging technologies. The chemical analytes of interest in this review are (a) volatile organic compounds (VOCs) associated with security applications (e.g., illegal, hazardous, and terrorist events), (b) chemical "signatures" associated with human presence, and
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Affiliation(s)
- Stamatios Giannoukos
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool, L69 3GJ, U.K
| | - Boris Brkić
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool, L69 3GJ, U.K.,Q-Technologies Ltd., 100 Childwall Road, Liverpool, L15 6UX, U.K
| | - Stephen Taylor
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool, L69 3GJ, U.K.,Q-Technologies Ltd., 100 Childwall Road, Liverpool, L15 6UX, U.K
| | - Alan Marshall
- Department of Electrical Engineering and Electronics, University of Liverpool , Liverpool, L69 3GJ, U.K
| | - Guido F Verbeck
- Department of Chemistry, University of North Texas , Denton, Texas 76201, United States
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Staymates JL, Staymates ME, Lawrence J. The effect of reusing wipes for particle collection. INTERNATIONAL JOURNAL FOR ION MOBILITY SPECTROMETRY : OFFICIAL PUBLICATION OF THE INTERNATIONAL SOCIETY FOR ION MOBILITY SPECTROMETRY 2015; 19:41-49. [PMID: 27429581 PMCID: PMC4922414 DOI: 10.1007/s12127-015-0185-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 10/27/2015] [Accepted: 10/28/2015] [Indexed: 11/15/2022]
Abstract
Sample collection for Ion Mobility Spectrometry (IMS) analysis is typically completed by swiping a collection wipe over a suspect surface to collect trace residues. The work presented here addresses the need for a method to measure the collection efficiency performance of surface wipe materials as a function of the number of times a wipe is used to interrogate a surface. The primary purpose of this study is to investigate the effect of wipe reuse, i.e., the number of times a wipe is swiped across a surface, on the overall particle collection and IMS response. Two types of collection wipes (Teflon coated fiberglass and Nomex) were examined by swiping multiple times, ranging from 0 to 1000, over representative surfaces that are common to security screening environments. Particle collection efficiencies were determined by fluorescence microscopy and particle counting techniques, and were shown to improve dramatically with increased number of swiping cycles. Ion mobility spectrometry was used to evaluate the chemical response of known masses of explosives (deposited after reusing wipes) as a function of the wipe reuse number. Results show that chemical response can be negatively affected, and greatly depends upon the conditions of the surface in which the wipe is interrogating. For most parameters tested, the PCE increased after the wipe was reused several times. Swiping a dusty cardboard surface multiple times also caused an increase in particle collection efficiency but a decrease in IMS response. Scanning electron microscopy images revealed significant surface degradation of the wipes on dusty cardboard at the micrometer spatial scale level for Teflon coated wipes. Additionally, several samples were evaluated by including a seven second thermal desorption cycle at 235°C into each swipe sampling interval in order to represent the IMS heating cycle. Results were similar to studies conducted without this heating cycle, suggesting that the primary mechanism for wipe deterioration is mechanical rather than thermal.
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Affiliation(s)
- Jessica L. Staymates
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Mailstop 8371, Gaithersburg, MD 20899 USA
| | - Matthew E. Staymates
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Mailstop 8371, Gaithersburg, MD 20899 USA
| | - Jeffrey Lawrence
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Mailstop 8371, Gaithersburg, MD 20899 USA
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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: 108] [Impact Index Per Article: 12.0] [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.
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Affiliation(s)
- R Cumeras
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Esfera UAB, Campus UAB s/n, E-08193 Bellaterra, Barcelona, Spain.
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12
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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: 280] [Impact Index Per Article: 31.1] [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.
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Affiliation(s)
- R Cumeras
- Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Esfera UAB, Campus UAB s/n, E-08193 Bellaterra, Barcelona, Spain.
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Maurer F, Wolf A, Fink T, Rittershofer B, Heim N, Volk T, Baumbach JI, Kreuer S. Wash-out of ambient air contaminations for breath measurements. J Breath Res 2014; 8:027107. [DOI: 10.1088/1752-7155/8/2/027107] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Vautz W, Seifert L, Liedtke S, Hein D. GC/IMS and GC/MS analysis of pre-concentrated medical and biological samples. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s12127-014-0146-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Direct analysis of human breath ammonia using corona discharge ion mobility spectrometry. J Pharm Biomed Anal 2014; 88:315-20. [DOI: 10.1016/j.jpba.2013.08.047] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 08/24/2013] [Accepted: 08/27/2013] [Indexed: 01/13/2023]
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Giannoukos S, Brkić B, Taylor S, France N. Monitoring of human chemical signatures using membrane inlet mass spectrometry. Anal Chem 2013; 86:1106-14. [PMID: 24377277 DOI: 10.1021/ac403621c] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This work is an attempt to assist border security crackdown on illegal human immigration, by providing essential results on human chemical signatures. Data was obtained using a portable quadrupole mass spectrometer coupled with a membrane probe for volunteers of both genders and under different conditions in a container simulator. During experiments, participants were asked to follow various protocols while volatile organic compounds emitted from their breath, sweat, skin, and other biological excretes were continuously being monitored. Experimental setups using different membrane materials (both hydrophilic and hydrophobic) including heating of the sampling probe and sampling flow rates were examined. From our measurements, significant information was obtained for NH3, CO2, water, and volatile organic compounds levels, illustrating a human chemical profile and indicating human presence in a confined space.
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Affiliation(s)
- Stamatios Giannoukos
- Department of Electrical Engineering and Electronics, University of Liverpool , Brownlow Hill, Liverpool, L69 3GJ, United Kingdom
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Vautz W, Slodzynski R, Hariharan C, Seifert L, Nolte J, Fobbe R, Sielemann S, Lao BC, Huo R, Thomas CLP, Hildebrand L. Detection of Metabolites of Trapped Humans Using Ion Mobility Spectrometry Coupled with Gas Chromatography. Anal Chem 2013; 85:2135-42. [DOI: 10.1021/ac302752f] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wolfgang Vautz
- Leibniz-Institut für Analytische Wissenschaften−ISAS−e.V., Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Rafael Slodzynski
- Leibniz-Institut für Analytische Wissenschaften−ISAS−e.V., Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Chandrasekhara Hariharan
- Leibniz-Institut für Analytische Wissenschaften−ISAS−e.V., Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Luzia Seifert
- Leibniz-Institut für Analytische Wissenschaften−ISAS−e.V., Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Jürgen Nolte
- Leibniz-Institut für Analytische Wissenschaften−ISAS−e.V., Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Rita Fobbe
- Leibniz-Institut für Analytische Wissenschaften−ISAS−e.V., Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
| | - Stefanie Sielemann
- Gesellschaft für analytische Sensorsysteme mbH (G.A.S.), Otto-Hahn-Straße
15, 44227 Dortmund, Germany
| | - Bolan C. Lao
- Gesellschaft für analytische Sensorsysteme mbH (G.A.S.), Otto-Hahn-Straße
15, 44227 Dortmund, Germany
| | - Ran Huo
- Department of Chemistry, Centre
for Analytical Science, Loughborough University, LE11 3TU, United Kingdom
| | - C. L. Paul Thomas
- Department of Chemistry, Centre
for Analytical Science, Loughborough University, LE11 3TU, United Kingdom
| | - Lars Hildebrand
- Department of Computer
Science, University of Dortmund, Otto-Hahn Street 16, 44227 Dortmund, Germany
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Ion mobility spectrometry for microbial volatile organic compounds: a new identification tool for human pathogenic bacteria. Appl Microbiol Biotechnol 2012; 93:2603-14. [PMID: 22327321 PMCID: PMC3605498 DOI: 10.1007/s00253-012-3924-4] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Revised: 01/22/2012] [Accepted: 01/25/2012] [Indexed: 11/09/2022]
Abstract
Presently, 2 to 4 days elapse between sampling at infection suspicion and result of microbial diagnostics. This delay for the identification of pathogens causes quite often a late and/or inappropriate initiation of therapy for patients suffering from infections. Bad outcome and high hospitalization costs are the consequences of these currently existing limited pathogen identification possibilities. For this reason, we aimed to apply the innovative method multi-capillary column–ion mobility spectrometry (MCC-IMS) for a fast identification of human pathogenic bacteria by determination of their characteristic volatile metabolomes. We determined volatile organic compound (VOC) patterns in headspace of 15 human pathogenic bacteria, which were grown for 24 h on Columbia blood agar plates. Besides MCC-IMS determination, we also used thermal desorption–gas chromatography–mass spectrometry measurements to confirm and evaluate obtained MCC-IMS data and if possible to assign volatile compounds to unknown MCC-IMS signals. Up to 21 specific signals have been determined by MCC-IMS for Proteus mirabilis possessing the most VOCs of all investigated strains. Of particular importance is the result that all investigated strains showed different VOC patterns by MCC-IMS using positive and negative ion mode for every single strain. Thus, the discrimination of investigated bacteria is possible by detection of their volatile organic compounds in the chosen experimental setup with the fast and cost-effective method MCC-IMS. In a hospital routine, this method could enable the identification of pathogens already after 24 h with the consequence that a specific therapy could be initiated significantly earlier.
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Kreuder AE, Buchinger H, Kreuer S, Volk T, Maddula S, Baumbach JI. Characterization of propofol in human breath of patients undergoing anesthesia. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s12127-011-0080-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Neuhaus S, Seifert L, Vautz W, Nolte J, Bufe A, Peters M. Comparison of metabolites in exhaled breath and bronchoalveolar lavage fluid samples in a mouse model of asthma. J Appl Physiol (1985) 2011; 111:1088-95. [PMID: 21778419 DOI: 10.1152/japplphysiol.00476.2011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND A multi-capillary column ion mobility spectrometer (MCC/IMS) was developed to provide a method for the noninvasive diagnosis of lung diseases. The possibility of measuring the exhaled breath of mice was evaluated previously. The aim of the present study was to reveal whether mice affected by airway inflammation can be identified via MCC/IMS. METHODS Ten mice were sensitized and challenged with ovalbumin to induce allergic airway inflammation. The breath and volatile compounds of bronchoalveolar lavage fluid (BALF) were measured by MCC/IMS. Furthermore, histamine, nitric oxide, and arachidonic acid were determined as inflammatory markers in vitro. RESULTS Six volatile molecules were found in the BALF headspace at a significantly higher concentration in mice with airway inflammation compared with healthy animals. The concentration of substances correlated with the numbers of infiltrating eosinophilic granulocytes. However, substances showing a significantly different concentration in the BALF headspace were not found to be different in exhaled breath. Histamine and nitric oxide were identified by MCC/IMS in vitro but not in the BALF headspace or exhaled breath. CONCLUSION Airway inflammation in mice is detectable by the analysis of the BALF headspace via MCC/IMS. Molecules detected in the BALF headspace of asthmatic mice at a higher concentration than in healthy animals may originate from oxidative stress induced by airway inflammation. As already described for humans, we found no correlation between the biomarker concentration in the BALF and the breath of mice. We suggest using the model described here to gain deeper insights into this discrepancy.
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Affiliation(s)
- Stephanie Neuhaus
- Department of Experimental Pneumology, Ruhr-University Bochum, Bochum, Germany
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Novel design for drift tubes in ion mobility spectrometry for optimised resolution of peak clusters. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s12127-011-0059-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ion characterisation by comparison of ion mobility spectrometry and mass spectrometry data. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/s12127-010-0051-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Alignment of retention time obtained from multicapillary column gas chromatography used for VOC analysis with ion mobility spectrometry. Anal Bioanal Chem 2010; 397:2385-94. [PMID: 20512565 PMCID: PMC2895891 DOI: 10.1007/s00216-010-3798-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Revised: 04/21/2010] [Accepted: 04/27/2010] [Indexed: 11/21/2022]
Abstract
Multicapillary column (MCC) ion mobility spectrometers (IMS) are increasingly in demand for medical diagnosis, biological applications and process control. In a MCC-IMS, volatile compounds are differentiated by specific retention time and ion mobility when rapid preseparation techniques are applied, e.g. for the analysis of complex and humid samples. Therefore, high accuracy in the determination of both parameters is required for reliable identification of the signals. The retention time in the MCC is the subject of the present investigation because, for such columns, small deviations in temperature and flow velocity may cause significant changes in retention time. Therefore, a universal correction procedure would be a helpful tool to increase the accuracy of the data obtained from a gas-chromatographic preseparation. Although the effect of the carrier gas flow velocity and temperature on retention time is not linear, it could be demonstrated that a linear alignment can compensate for the changes in retention time due to common minor deviations of both the carrier gas flow velocity and the column temperature around the MCC-IMS standard operation conditions. Therefore, an effective linear alignment procedure for the correction of those deviations has been developed from the analyses of defined gas mixtures under various experimental conditions. This procedure was then applied to data sets generated from real breath analyses obtained in clinical studies using different instruments at different measuring sites for validation. The variation in the retention time of known signals, especially for compounds with higher retention times, was significantly improved. The alignment of the retention time—an indispensable procedure to achieve a more precise identification of analytes—using the proposed method reduces the random error caused by small accidental deviations in column temperature and flow velocity significantly.
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Hariharan CB, Baumbach JI, Vautz W. Linearized equations for the reduced ion mobilities of polar aliphatic organic compounds. Anal Chem 2010; 82:427-31. [PMID: 19961221 DOI: 10.1021/ac902459m] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Over the years, ion mobility spectrometry has evolved into a powerful technique for rapid identification of analytes in very complex sample matrixes such as human breath. Every analyte detected has a characteristic ion mobility value (and a retention time when additional preseparation techniques are employed) which is used to identify the peaks in a spectrum either by comparison with reference analytes or by simultaneous mass spectrometric measurements. In this study, the mass-mobility correlations between compounds in three different homologous series are used to predict the mobilities of the other substances in the same series in a medium of synthetic air. The results show a very high accuracy (>99.5%) of the prognosis. The linear trend equations of ion mobilities, as a function of the number of carbon atoms, obtained from the different series were then generalized into one linear equation for the reduced ion mobility for the polar aliphatic compounds and is validated by comparing it with the traditional Mason-Schamp equation. To compare the empirical equation obtained from the prognosis and the Mason-Schamp equation, the collision integral term in the latter was split into two terms to linearize it. The resulting novel ion mobility equation could be the starting step to completely describe the relationship between ion collision integral and the ion mobility for polar aliphatic compounds. The splitting of the collision integral into two terms will also give new inputs to describe the various ion models and the different forces that act on the ions and the neutral gas molecules upon which the collision integral is dependent on. This prognosis method could, furthermore, be extended to all other classes of organic compounds and could serve as a useful tool for identification of unknowns in ion mobility spectra, thereby considerably reducing the time-consuming and costly reference measurements and other coupling techniques that are currently employed.
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Jünger M, Bödeker B, Baumbach JI. Peak assignment in multi-capillary column–ion mobility spectrometry using comparative studies with gas chromatography–mass spectrometry for VOC analysis. Anal Bioanal Chem 2009; 396:471-82. [DOI: 10.1007/s00216-009-3168-z] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Revised: 08/28/2009] [Accepted: 09/17/2009] [Indexed: 10/20/2022]
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Baumbach JI. Ion mobility spectrometry coupled with multi-capillary columns for metabolic profiling of human breath. J Breath Res 2009; 3:034001. [PMID: 21383463 DOI: 10.1088/1752-7155/3/3/034001] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Recently, ion mobility spectrometry (IMS) started to be used for direct breath analysis with respect to metabolic profiling, biomarker finding and gas trace analysis. The present review describes the basic operation of an ion mobility spectrometer including the ionization process, humidity effects and sampling procedures. To enhance the resolution, pre-separation by multi-capillary columns (MCCs) is discussed and examples for IMS chromatograms are presented. The focus is to review the analytical method IMS with respect to potential use for direct investigations of humid air in direct breath analysis but not on detailed discussion of results of specific medical application of MCC/IMS or on specific analytes found in exhaled air.
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Affiliation(s)
- Jörg Ingo Baumbach
- ISAS-Institute for Analytical Sciences, Department of Metabolomics, Bunsen-Kirchhoff-Straße 11, 44139 Dortmund, Germany
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Hariharan C, Ingo Baumbach J, Vautz W. Empirical prediction of reduced ion mobilities of secondary alcohols. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s12127-009-0017-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vautz W, Bödeker B, Baumbach JI, Bader S, Westhoff M, Perl T. An implementable approach to obtain reproducible reduced ion mobility. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s12127-009-0018-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Goldsmith P, Fenton H, Morris-Stiff G, Ahmad N, Fisher J, Prasad KR. Metabonomics: a useful tool for the future surgeon. J Surg Res 2009; 160:122-32. [PMID: 19592031 DOI: 10.1016/j.jss.2009.03.003] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2008] [Revised: 11/11/2008] [Accepted: 03/03/2009] [Indexed: 12/25/2022]
Abstract
BACKGROUND In the past decade or so, a range of technologies have emerged that have shown promise in increasing our understanding of disease processes and progression. These advances are referred to as the "omics" technologies; genomics, transcriptomics, and proteomics. More recently, another "omics" approach has come to the fore: metabonomics, and this technology has the potential for significant clinical impact. Metabonomics refers to the analysis of the metabolome, that is, the metabolic profile of a system. The advantage of studying the metabolome is that the end points of biological events are elucidated. RESULTS Although still in its infancy, the metabonomics approach has shown immense promise in areas as diverse as toxicology studies to the discovery of biomarkers of disease. It has also been applied to studies of both renal and hepatic transplants. Metabolome analysis may be conducted on a variety of biological fluids and tissue types and may utilize a number of different technology platforms, mass spectrometry (MS) and nuclear magnetic resonance (NMR) spectroscopy being the most popular. In this review, we cover the background to the evolution of metabonomics and its applications with particular emphasis on clinical applications. CONCLUSIONS We conclude with the suggestion that metabonomics offers a platform for further biomarker development, drug development, and in the field of medicine.
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Affiliation(s)
- Paul Goldsmith
- Hepatopancreatobiliary and Transplant Unit, St. James's University Hospital, Leeds, United Kingdom.
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Bödeker B, Vautz W, Baumbach JI. Peak comparison in MCC/IMS-data—searching for potential biomarkers in human breath data. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s12127-008-0013-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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