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Schulz E, Woollam M, Vashistha S, Agarwal M. Quantifying exhaled acetone and isoprene through solid phase microextraction and gas chromatography-mass spectrometry. Anal Chim Acta 2024; 1301:342468. [PMID: 38553125 DOI: 10.1016/j.aca.2024.342468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 03/04/2024] [Accepted: 03/11/2024] [Indexed: 04/02/2024]
Abstract
BACKGROUND Acetone, isoprene, and other volatile organic compounds (VOCs) in exhaled breath have been shown to be biomarkers for many medical conditions. Researchers use different techniques for VOC detection, including solid phase microextraction (SPME), to preconcentrate volatile analytes prior to instrumental analysis by gas chromatography-mass spectrometry (GC-MS). These techniques include a previously developed method to detect VOCs in breath directly using SPME, but it is uncommon for studies to quantify exhaled volatiles because it can be time consuming due to the need of many external/internal standards, and there is no standardized or widely accepted method. The objective of this study was to develop an accessible method to quantify acetone and isoprene in breath by SPME GC-MS. RESULTS A system was developed to mimic human exhalation and expose VOCs to a SPME fiber in the gas phase at known concentrations. VOCs were bubbled/diluted with dry air at a fixed flow rate, duration, and volume that was comparable to a previously developed breath sampling method. Identification of acetone and isoprene through GC-MS was verified using standards and observing overlaps in chromatographic retention/mass spectral fragmentation. Calibration curves were developed for these two analytes, which showed a high degree of linear correlation. Acetone and isoprene displayed limits of detection/quantification equal to 12 ppb/37 ppb and 73 ppb/222 ppb respectively. Quantification results in healthy breath samples (n = 15) showed acetone concentrations spanned between 71 ppb and 294 ppb, and isoprene varied between 170 ppb and 990 ppb. Both concentration ranges for acetone and isoprene in this study overlap with those reported in existing literature. SIGNIFICANCE Results indicate the development of a system to quantify acetone and isoprene in breath that can be adapted to diverse sampling methods and instrumental analyses beyond SPME GC-MS.
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Affiliation(s)
- Eray Schulz
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN, 46202, USA; Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN, 46202, USA
| | - Mark Woollam
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN, 46202, USA; Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN, 46202, USA
| | - Sneha Vashistha
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN, 46202, USA
| | - Mangilal Agarwal
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN, 46202, USA; Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN, 46202, USA; Department of BioHealth Informatics, Indiana University-Purdue University, Indianapolis, IN, 46202, USA.
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2
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Tallon AK, Manning LA, Mas F. Electrophysiological and Behavioral Responses of Virgin Female Bactrocera tryoni to Microbial Volatiles from Enterobacteriaceae. Microorganisms 2023; 11:1643. [PMID: 37512816 PMCID: PMC10385192 DOI: 10.3390/microorganisms11071643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/18/2023] [Accepted: 06/19/2023] [Indexed: 07/30/2023] Open
Abstract
The Queensland fruit fly (Bactrocera tryoni) is a major polyphagous pest widespread in Australia and several Pacific Islands. Bacteria present on the host plant phyllosphere supply proteins, essential for egg development and female sexual maturity. We investigated the role of microbial volatile organic compounds (MVOCs) emitted by Enterobacteriaceae commonly found on the host plant and in the fly gut in attracting virgin females. Bacteria were cultured on artificial media and natural fruits, at various pH, and MVOCs were collected using different headspace volatile absorbent materials. The olfactory responses of virgin females to bacterial MVOCs were assessed via electrophysiology and behavioral assays. The production of MVOCs was strongly influenced qualitatively by the bacterial strain and the type of media, and it semi-quantitatively varied with pH and time. MVOCs emitted by Klebsiella oxytoca invoked the strongest antennal response and were the most attractive. Among the identified compounds triggering an olfactory response, D-limonene and 2-nonanone were both significantly behaviorally attractive, whereas phenol, nonanal, isoamyl alcohol, and some pyrazines appeared to be repulsive. This study deepens our understanding of the chemical ecology between fruit flies and their bacterial symbionts and paves the way for novel synthetic lures based on specifically MVOCs targeting virgin females.
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Affiliation(s)
- Anaïs K Tallon
- Department of Wildlife, Fisheries and Aquaculture, University of Mississippi State, Starkville, MS 39762, USA
| | - Lee-Anne Manning
- The New Zealand Institute for Plant and Food Research Ltd., Canterbury Agriculture & Science Centre, 74 Gerald St, Lincoln 7608, New Zealand
| | - Flore Mas
- The New Zealand Institute for Plant and Food Research Ltd., Canterbury Agriculture & Science Centre, 74 Gerald St, Lincoln 7608, New Zealand
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3
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Schulz E, Woollam M, Grocki P, Davis MD, Agarwal M. Methods to Detect Volatile Organic Compounds for Breath Biopsy Using Solid-Phase Microextraction and Gas Chromatography-Mass Spectrometry. Molecules 2023; 28:molecules28114533. [PMID: 37299010 DOI: 10.3390/molecules28114533] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Volatile organic compounds (VOCs) are byproducts from metabolic pathways that can be detected in exhaled breath and have been reported as biomarkers for different diseases. The gold standard for analysis is gas chromatography-mass spectrometry (GC-MS), which can be coupled with various sampling methods. The current study aims to develop and compare different methods for sampling and preconcentrating VOCs using solid-phase microextraction (SPME). An in-house sampling method, direct-breath SPME (DB-SPME), was developed to directly extract VOCs from breath using a SPME fiber. The method was optimized by exploring different SPME types, the overall exhalation volume, and breath fractionation. DB-SPME was quantitatively compared to two alternative methods involving the collection of breath in a Tedlar bag. In one method, VOCs were directly extracted from the Tedlar bag (Tedlar-SPME) and in the other, the VOCs were cryothermally transferred from the Tedlar bag to a headspace vial (cryotransfer). The methods were verified and quantitatively compared using breath samples (n = 15 for each method respectively) analyzed by GC-MS quadrupole time-of-flight (QTOF) for compounds including but not limited to acetone, isoprene, toluene, limonene, and pinene. The cryotransfer method was the most sensitive, demonstrating the strongest signal for the majority of the VOCs detected in the exhaled breath samples. However, VOCs with low molecular weights, including acetone and isoprene, were detected with the highest sensitivity using the Tedlar-SPME. On the other hand, the DB-SPME was less sensitive, although it was rapid and had the lowest background GC-MS signal. Overall, the three breath-sampling methods can detect a wide variety of VOCs in breath. The cryotransfer method may be optimal when collecting a large number of samples using Tedlar bags, as it allows the long-term storage of VOCs at low temperatures (-80 °C), while Tedlar-SPME may be more effective when targeting relatively small VOCs. The DB-SPME method may be the most efficient when more immediate analyses and results are required.
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Affiliation(s)
- Eray Schulz
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Mark Woollam
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Paul Grocki
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Michael D Davis
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Mangilal Agarwal
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Department of Mechanical & Energy Engineering, Indiana University-Purdue University, Indianapolis, IN 46202, USA
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Mametov R, Sagandykova G, Monedeiro-Milanowski M, Gabryś D, Pomastowski P. Electropolymerized polypyrrole-MOF composite as a coating material for SPME fiber for extraction VOCs liberated by bacteria. Sci Rep 2023; 13:8933. [PMID: 37264070 DOI: 10.1038/s41598-023-36081-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/29/2023] [Indexed: 06/03/2023] Open
Abstract
The synthesis of efficient and low-cost coatings for solid-phase microextraction attracted much attention. Conductive polymers are excellent candidates for this purpose due to the possibility of electropolymerization, which results in the reproducible synthesis of films. A plethora of studies reported in the literature concluded that modification of conductive polymers with innovative materials could lead to an increase in sensitivity toward specific analytes. In this work, the metal-organic framework-polypyrrole composite was electrodeposited in one step directly onto a stainless-steel substrate. The effect of synthesis parameters on extraction efficiency was investigated. The obtained PPy@ZIF-8 coating was subjected to physical-chemical characterization using electron microscopy and Fourier-transform IR spectroscopy. The main finding of the study was that the values of the limit of detection and intra- and inter-day reproducibility for analytes with different chemical structures were found to be lower as compared to pure polypyrrole coating. Furthermore, the obtained polypyrrole-MOF coating was applied for the collection of profiles of volatile organic compounds liberated by bacteria. Hence, the polypyrrole@ZIF-8 coating synthesized using a low-cost and facile approach presented in this study can be useful for the profiling of VOCs liberated by bacteria.
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Affiliation(s)
- Radik Mametov
- Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Toruń, Wileńska 4, 87-100, Toruń, Poland.
| | - Gulyaim Sagandykova
- Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Toruń, Wileńska 4, 87-100, Toruń, Poland
| | - Maciej Monedeiro-Milanowski
- Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Toruń, Wileńska 4, 87-100, Toruń, Poland
| | - Dorota Gabryś
- Radiotherapy Department, Maria Sklodowska-Curie National Research and Institute of Oncology, Gliwice, Poland
| | - Paweł Pomastowski
- Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Toruń, Wileńska 4, 87-100, Toruń, Poland
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Kingsley S, Xu Z, Jones B, Saleh J, Orlando TM. A Mass Spectrometry-Machine Learning Approach for Detecting Volatile Organic Compound Emissions for Early Fire Detection. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:826-835. [PMID: 37079759 PMCID: PMC10161216 DOI: 10.1021/jasms.2c00304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 03/03/2023] [Accepted: 03/24/2023] [Indexed: 05/03/2023]
Abstract
Mass spectrometry in parallel with real-time machine learning techniques were paired in a novel application to detect and identify chemically specific, early indicators of fires and near-fire events involving a set of selected materials: Mylar, Teflon, and poly(methyl methacrylate) (PMMA). The volatile organic compounds emitted during the thermal decomposition of each of the three materials were characterized using a quadrupole mass spectrometer which scanned the 1-200 m/z range. CO2, CH3CHO, and C6H6 were the main volatiles detected during Mylar thermal decomposition, while Teflon's thermal decomposition yielded CO2 and a set of fluorocarbon compounds including CF4, C2F4, C2F6, C3F6, CF2O, and CF3O. PMMA produced CO2 and methyl methacrylate (MMA, C5H8O2). The mass spectral peak patterns observed during the thermal decomposition of each material were unique to that material and were therefore useful as chemical signatures. It was also observed that the chemical signatures remained consistent and detectable when multiple materials were heated together. Mass spectra data sets containing the chemical signatures for each material and mixtures were collected and analyzed using a random forest panel machine learning classification. The classification was tested and demonstrated 100% accuracy for single material spectra and an average of 92.3% accuracy for mixed material spectra. This investigation presents a novel technique for the real-time, chemically specific detection of fire related VOCs through mass spectrometry which shows promise as a more rapid and accurate method for detecting fires or near-fire events.
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Affiliation(s)
- Sarah Kingsley
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, 901 Atlantic Dr, Atlanta, Georgia 30318, United
States
| | - Zhaoyi Xu
- Guggenheim
School of Aerospace Engineering, Georgia
Institute of Technology, 270 Ferst Dr, Atlanta, Georgia 30313, United States
| | - Brant Jones
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, 901 Atlantic Dr, Atlanta, Georgia 30318, United
States
| | - Joseph Saleh
- Guggenheim
School of Aerospace Engineering, Georgia
Institute of Technology, 270 Ferst Dr, Atlanta, Georgia 30313, United States
| | - Thomas M. Orlando
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, 901 Atlantic Dr, Atlanta, Georgia 30318, United
States
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6
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Xie J, Li X, Li W, Ding H, Yin J, Bie S, Li F, Tian C, Han L, Yang W, Song X, Yu H, Li Z. Characterization of the key volatile organic components of different parts of fresh and dried Perilla frutescens based on headspace-gas chromatography-ion mobility spectrometry and headspace solid phase microextraction-gas chromatography-mass spectrometry. ARAB J CHEM 2023. [DOI: 10.1016/j.arabjc.2023.104867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
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7
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Kang L, Kaur J, Winkeler K, Kubiak D, Hill JE. How the volatile organic compounds emitted by corpse plant change through flowering. Sci Rep 2023; 13:372. [PMID: 36611048 PMCID: PMC9825558 DOI: 10.1038/s41598-022-27108-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 12/26/2022] [Indexed: 01/09/2023] Open
Abstract
The corpse plant (Amorphophallus titanum) is so named because it produces a pungent, foul odor when flowering. Little is known about how the emitted volatiles change throughout the two-day flowering period. In this study, the comprehensive monitoring of the presence and change in volatile molecules during the female and the male flowering phases of A. titanum was conducted, and the plant temperature was monitored. A total of 422 volatile features were detected over the entire sampling period, of which 118 features were statistically significantly different between the pre-flowering and both flowering phases, and an additional 304 features were found present throughout the flowering period. A total of 45 molecules could be assigned putative names. The volatile profile of A. titanum changes over the two-day flowering period, with the S-containing molecules and aldehydes dominant in the female flowering phase, and the alcohols and hydrocarbons dominant in the male flowering phase. The two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC-TOFMS) enabled us to identify 32 new molecules produced by A. titanum. Each of these molecules alone, and in combination, likely contribute to the different odors emitted during the flowering phase of A. titanum.
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Affiliation(s)
- Lili Kang
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA
| | - Jasmeen Kaur
- Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, 2360 E Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Kelsey Winkeler
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA
| | - Daniella Kubiak
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA
| | - Jane E Hill
- Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755, USA.
- Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, 2360 E Mall, Vancouver, BC, V6T 1Z3, Canada.
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8
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Zanella D, Henin A, Mascrez S, Stefanuto P, Franchina FA, Focant J, Purcaro G. Comprehensive two-dimensional gas chromatographic platforms comparison for exhaled breath metabolites analysis. J Sep Sci 2022; 45:3542-3555. [PMID: 35853166 PMCID: PMC9804543 DOI: 10.1002/jssc.202200164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 07/13/2022] [Accepted: 07/13/2022] [Indexed: 01/05/2023]
Abstract
The high potential of exhaled breath for disease diagnosis has been highlighted in numerous studies. However, exhaled breath analysis is suffering from a lack of standardized sampling and analysis procedures, impacting the robustness of inter-laboratory results, and thus hampering proper external validation. The aim of this work was to verify compliance and validate the performance of two different comprehensive two-dimensional gas chromatography coupled to mass spectrometry platforms in different laboratories by monitoring probe metabolites in exhaled breath following the Peppermint Initiative guidelines. An initial assessment of the exhaled breath sampling conditions was performed, selecting the most suitable sampling bag material and volume. Then, a single sampling was performed using Tedlar bags, followed by the trapping of the volatile organic compounds into thermal desorption tubes for the subsequent analysis using two different analytical platforms. The thermal desorption tubes were first analyzed by a (cryogenically modulated) comprehensive two-dimensional gas chromatography system coupled to high-resolution time-of-flight mass spectrometry. The desorption was performed in split mode and the split part was recollected in the same tube and further analyzed by a different (flow modulated) comprehensive two-dimensional gas chromatography system with a parallel detection, specifically using a quadrupole mass spectrometer and a vacuum ultraviolet detector. Both the comprehensive two-dimensional gas chromatography platforms enabled the longitudinal tracking of the peppermint oil metabolites in exhaled breath. The increased sensitivity of comprehensive two-dimensional gas chromatography enabled to successfully monitor over a 6.5 h period a total of 10 target compounds, namely α-pinene, camphene, β-pinene, limonene, cymene, eucalyptol, menthofuran, menthone, isomenthone, and neomenthol.
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Affiliation(s)
- Delphine Zanella
- Molecular System, Organic & Biological Analytical Chemistry GroupUniversity of LiègeLiègeBelgium
| | - Adèle Henin
- Molecular System, Organic & Biological Analytical Chemistry GroupUniversity of LiègeLiègeBelgium
| | - Steven Mascrez
- Gembloux Agro‐Bio TechUniversity of LiègeGemblouxBelgium
| | - Pierre‐Hugues Stefanuto
- Molecular System, Organic & Biological Analytical Chemistry GroupUniversity of LiègeLiègeBelgium
| | - Flavio Antonio Franchina
- Department of Chemistry, Pharmaceutical, and Agricultural SciencesUniversity of FerraraFerraraItaly
| | - Jean‐François Focant
- Molecular System, Organic & Biological Analytical Chemistry GroupUniversity of LiègeLiègeBelgium
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9
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Rosenthal K, Hunsicker E, Ratcliffe E, Lindley MR, Leonard J, Hitchens JR, Turner MA. Volatile atmospheric pressure chemical ionisation mass spectrometry headspace analysis of E. coli and S. aureus. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:5441-5449. [PMID: 34780594 DOI: 10.1039/d1ay01555a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Identifying the characteristics of bacterial species can improve treatment outcomes and mass spectrometry methods have been shown to be capable of identifying biomarkers of bacterial species. This study is the first to use volatile atmospheric pressure chemical ionisation mass spectrometry to directly and non-invasively analyse the headspace of E. coli and S. aureus bacterial cultures, enabling major biological classification at species level (Gram negative/positive respectively). Four different protocols were used to collect data, three utilising discrete 5 min samples taken between 2 and 96 h after inoculation and one method employing 24 h continuous sampling. Characteristic marker ions were found for both E. coli and S. aureus. A model to distinguish between sample types was able to correctly identify the bacteria samples after sufficient growth (24-48 h), with similar results obtained across different sampling methods. This demonstrates that this is a robust method to analyse and classify bacterial cultures accurately and within a relevant time frame, offering a promising technique for both clinical and research applications.
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Affiliation(s)
- Kerry Rosenthal
- School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough, UK.
| | - Eugenie Hunsicker
- Department of Mathematical Sciences, Loughborough University, Loughborough, UK
| | - Elizabeth Ratcliffe
- Department of Chemical Engineering, Loughborough University, Loughborough, UK
| | - Martin R Lindley
- School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough, UK.
- Translational Chemical Biology Research Group, Loughborough University, Loughborough, UK
| | - Joshua Leonard
- Department of Chemistry, Loughborough University, Loughborough, UK
| | - Jack R Hitchens
- Department of Chemistry, Loughborough University, Loughborough, UK
| | - Matthew A Turner
- Translational Chemical Biology Research Group, Loughborough University, Loughborough, UK
- Department of Chemistry, Loughborough University, Loughborough, UK
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10
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Zanella D, Liden T, York J, Franchina FA, Focant JF, Schug KA. Exploiting targeted and untargeted approaches for the analysis of bacterial metabolites under altered growth conditions. Anal Bioanal Chem 2021; 413:5321-5332. [PMID: 34254157 DOI: 10.1007/s00216-021-03505-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 06/22/2021] [Accepted: 06/25/2021] [Indexed: 11/28/2022]
Abstract
In the host, pathogenic microorganisms have developed stress responses to cope with constantly changing environments. Stress responses are directly related to changes in several metabolomic pathways, which could hamper microorganisms' unequivocal identification. We evaluated the effect of various in vitro stress conditions (acidic, basic, oxidative, ethanolic, and saline conditions) on the metabolism of Staphylococcus aureus, Bacillus cereus, and Pseudomonas aeruginosa, which are common lung pathogens. The metabolite profiles of the bacteria were analyzed using liquid chromatography coupled to triple quadrupole and quadrupole time-of-flight mass spectrometry. The advantages of targeted and untargeted analysis combined with univariate and multivariate statistical analysis (principal component analysis, hierarchical cluster analysis, partial least square discriminant analysis, random forest) were combined to unequivocally identify bacterial species. In normal in vitro conditions, the targeted methodology, based on the analysis of primary metabolites, enabled the rapid and efficient discrimination of the three bacteria. In changing in vitro conditions and specifically in presence of the various stressors, the untargeted methodology proved to be more valuable for the global and accurate differentiation of the three bacteria, also considering the type of stress environment within each species. In addition, species-specific metabolites (i.e., fatty acids, polysaccharides, peptides, and nucleotide bases derivatives) were putatively identified. Good intra-day repeatability and inter-day repeatability (< 10% RSD and < 15% RSD, respectively) were obtained for the targeted and the untargeted methods. This untargeted approach highlights its importance in unusual (and less known) bacterial growth environments, being a powerful tool for infectious disease diagnosis, where the accurate classification of microorganisms is sought.
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Affiliation(s)
- Delphine Zanella
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liege, 11 Allee du Six Aout, 4000, Liege, Belgium
| | - Tiffany Liden
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Box 19065, Arlington, TX, 76019, USA
| | - Jamie York
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Box 19065, Arlington, TX, 76019, USA
| | - Flavio A Franchina
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liege, 11 Allee du Six Aout, 4000, Liege, Belgium
| | - Jean-François Focant
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liege, 11 Allee du Six Aout, 4000, Liege, Belgium
| | - Kevin A Schug
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Box 19065, Arlington, TX, 76019, USA. .,Affiliate of Collaborative Laboratories for Environmental Analysis and Remediation, The University of Texas at Arlington, Arlington, TX, 76019, USA.
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11
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Stilo F, Bicchi C, Jimenez-Carvelo AM, Cuadros-Rodriguez L, Reichenbach SE, Cordero C. Chromatographic fingerprinting by comprehensive two-dimensional chromatography: Fundamentals and tools. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2020.116133] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Practical Considerations in Method Development for Gas Chromatography-Based Metabolomic Profiling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1336:139-157. [PMID: 34628631 DOI: 10.1007/978-3-030-77252-9_8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This chapter discusses the fundamentals of gas chromatography (GC) to improve method development for metabolic profiling of complex biological samples. The selection of column geometry and phase ratio impacts analyte mass transfer, which must be carefully optimized for fast analysis. Stationary phase selection is critical to obtain baseline resolution of critical pairs, but such selection must consider important aspects of metabolomic protocols, such as derivatization and dependence of analyte identification on existing databases. Sample preparation methods are also addressed depending on the sample matrix, including liquid-liquid extraction and solid-phase microextraction.
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Trinklein TJ, Schöneich S, Sudol PE, Warren CG, Gough DV, Synovec RE. Total-transfer comprehensive three-dimensional gas chromatography with time-of-flight mass spectrometry. J Chromatogr A 2020; 1634:461654. [DOI: 10.1016/j.chroma.2020.461654] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/19/2020] [Accepted: 10/26/2020] [Indexed: 12/25/2022]
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14
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Franchina FA, Zanella D, Dubois LM, Focant J. The role of sample preparation in multidimensional gas chromatographic separations for non‐targeted analysis with the focus on recent biomedical, food, and plant applications. J Sep Sci 2020; 44:188-210. [DOI: 10.1002/jssc.202000855] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/22/2020] [Accepted: 10/23/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Flavio A. Franchina
- Molecular System Organic & Biological Analytical Chemistry Group University of Liège Liège Belgium
| | - Delphine Zanella
- Molecular System Organic & Biological Analytical Chemistry Group University of Liège Liège Belgium
| | - Lena M. Dubois
- Molecular System Organic & Biological Analytical Chemistry Group University of Liège Liège Belgium
| | - Jean‐François Focant
- Molecular System Organic & Biological Analytical Chemistry Group University of Liège Liège Belgium
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15
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Schöneich S, Trinklein TJ, Warren CG, Synovec RE. A systematic investigation of comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry with dynamic pressure gradient modulation for high peak capacity separations. Anal Chim Acta 2020; 1134:115-124. [DOI: 10.1016/j.aca.2020.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 08/06/2020] [Accepted: 08/14/2020] [Indexed: 10/23/2022]
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Franchina FA, Zanella D, Dejong T, Focant JF. Impact of the adsorbent material on volatile metabolites during in vitro and in vivo bio-sampling. Talanta 2020; 222:121569. [PMID: 33167263 DOI: 10.1016/j.talanta.2020.121569] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/10/2020] [Accepted: 08/11/2020] [Indexed: 12/16/2022]
Abstract
The increased attraction of biological volatile compounds has opened the route to a wide variety of sampling techniques, amongst which trap tubes packed with adsorbent materials are commonly used. Many types of adsorbent materials are available and the choice of the adsorbent can impact the obtained results in untargeted analysis. Therefore, a proper combination of the adsorbent material and the sample is necessary to increase the robustness and reproducibility of biological studies. In this study, the sampling performance of thermal desorption tubes with six common adsorbent material combinations, i.e., Tenax® TA, Tenax® TA/Carbopack™ B, Tenax® TA/Sulficarb, Tenax® TA/Carbograph™ 5TD, Tenax® TA/Carbograph™ 1TD/Carboxen® 1003, and Carboxen® 1016/Carbograph™ 5TD, was evaluated in two different setups: in vitro and in vivo sampling. The in vitro setup consisted of the headspace dynamic extraction of spiked serum, and a mixture of 19 standards was evaluated in terms of response and reproducibility. The in vivo setup consisted into two parts: the first one was based the evaluation of the standard mixture, which was flash-vaporised into Tedlar® bags containing exhaled breath; the second part was based on the longitudinal monitoring of breath metabolites originating from a beverage intake (i.e., brewed coffee), over a 90 min time period. The tubes were all desorbed and analysed in a comprehensive two-dimensional gas chromatography system coupled to a high-resolution time-of-flight mass spectrometer (GC × GC-HR ToF MS). In both sampling setups, the widest analytes coverage and the overall best extraction yield on the selected compounds were obtained using Tenax® TA, followed by Tenax® TA/Carbopack™ B. Tenax® TA provided the highest sampling reproducibility with 12 %RSD, 10 %RSD and <5 %RSD of the response during the experiments using the in vitro setup, the in vivo setup, and during the longitudinal tracking, respectively.
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Affiliation(s)
- Flavio A Franchina
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liège, Liège, Belgium.
| | - Delphine Zanella
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liège, Liège, Belgium
| | - Thibaut Dejong
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liège, Liège, Belgium
| | - Jean-François Focant
- Molecular System, Organic & Biological Analytical Chemistry Group, University of Liège, Liège, Belgium
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Jenkins CL, Bean HD. Dependence of the Staphylococcal Volatilome Composition on Microbial Nutrition. Metabolites 2020; 10:metabo10090347. [PMID: 32867100 PMCID: PMC7569959 DOI: 10.3390/metabo10090347] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/16/2020] [Accepted: 08/23/2020] [Indexed: 01/09/2023] Open
Abstract
In vitro cultivation of staphylococci is fundamental to both clinical and research microbiology, but few studies, to-date, have investigated how the differences in rich media can influence the volatilome of cultivated bacteria. The objective of this study was to determine the influence of rich media composition on the chemical characteristics of the volatilomes of Staphylococcus aureus and Staphylococcus epidermidis. S. aureus (ATCC 12600) and S. epidermidis (ATCC 12228) were cultured in triplicate in four rich complex media (brain heart infusion (BHI), lysogeny broth (LB), Mueller Hinton broth (MHB), and tryptic soy broth (TSB)), and the volatile metabolites produced by each culture were analyzed using headspace solid-phase microextraction combined with comprehensive two-dimensional gas chromatography—time-of-flight mass spectrometry (HS-SPME-GC×GC-TOFMS). When comparing the chemical compositions of the staph volatilomes by the presence versus absence of volatiles produced in each medium, we observed few differences. However, when the relative abundances of volatiles were included in the analyses, we observed that culturing staph in media containing free glucose (BHI and TSB) resulted in volatilomes dominated by acids and esters (67%). The low-glucose media (LB and MHB) produced ketones in greatest relative abundances, but the volatilome compositions in these two media were highly dissimilar. We conclude that the staphylococcal volatilome is strongly influenced by the nutritional composition of the growth medium, especially the availability of free glucose, which is much more evident when the relative abundances of the volatiles are analyzed, compared to the presence versus absence.
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Affiliation(s)
- Carrie L. Jenkins
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA;
- Center for Fundamental and Applied Microbiomics, The Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Heather D. Bean
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA;
- Center for Fundamental and Applied Microbiomics, The Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Correspondence:
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18
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Veenaas C, Ripszam M, Haglund P. Analysis of volatile organic compounds in indoor environments using thermal desorption with comprehensive two-dimensional gas chromatography and high-resolution time-of-flight mass spectrometry. J Sep Sci 2020; 43:1489-1498. [PMID: 32052921 DOI: 10.1002/jssc.201901103] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 01/16/2020] [Accepted: 02/10/2020] [Indexed: 01/31/2023]
Abstract
Building-related health effects are frequently observed. Several factors have been listed as possible causes including temperature, humidity, light conditions, presence of particulate matter, and microorganisms or volatile organic compounds. To be able to link exposure to specific volatile organic compounds to building-related health effects, powerful and comprehensive analytical methods are required. For this purpose, we developed an active air sampling method that utilizes dual-bed tubes loaded with TENAX-TA and Carboxen-1000 adsorbents to sample two parallel air samples of 4 L each. For the comprehensive volatile organic compounds analysis, an automated thermal desorption comprehensive two-dimensional gas chromatography high-resolution time-of-flight mass spectrometry method was developed and used. It allowed targeted analysis of approximately 90 known volatile organic compounds with relative standard deviations below 25% for the vast majority of target volatile organic compounds. It also allowed semiquantification (no matching standards) of numerous nontarget air contaminants using the same data set. The nontarget analysis workflow included peak finding, background elimination, feature alignment, detection frequency filtering, and tentative identification. Application of the workflow to air samples from 68 indoor environments at a large hospital complex resulted in a comprehensive volatile organic compound characterization, including 178 single compounds and 13 hydrocarbon groups.
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Affiliation(s)
| | | | - Peter Haglund
- Department of Chemistry, Umeå University, Umeå, Sweden
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19
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Amaral MSS, Nolvachai Y, Marriott PJ. Comprehensive Two-Dimensional Gas Chromatography Advances in Technology and Applications: Biennial Update. Anal Chem 2019; 92:85-104. [DOI: 10.1021/acs.analchem.9b05412] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Michelle S. S. Amaral
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Yada Nolvachai
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Philip J. Marriott
- Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
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20
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Franchina FA, Zanella D, Lazzari E, Stefanuto P, Focant J. Investigating aroma diversity combining purge‐and‐trap, comprehensive two‐dimensional gas chromatography, and mass spectrometry. J Sep Sci 2019; 43:1790-1799. [DOI: 10.1002/jssc.201900902] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/15/2019] [Accepted: 10/26/2019] [Indexed: 12/27/2022]
Affiliation(s)
- Flavio Antonio Franchina
- Molecular SystemOrganic & Biological Analytical Chemistry GroupUniversity of Liège Liège Belgium
| | - Delphine Zanella
- Molecular SystemOrganic & Biological Analytical Chemistry GroupUniversity of Liège Liège Belgium
| | - Eliane Lazzari
- Molecular SystemOrganic & Biological Analytical Chemistry GroupUniversity of Liège Liège Belgium
- Institute of ChemistryFederal University of Rio Grande do Sul Porto Alegre Rio Grande do Sul Brazil
| | - Pierre‐Hugues Stefanuto
- Molecular SystemOrganic & Biological Analytical Chemistry GroupUniversity of Liège Liège Belgium
| | - Jean‐François Focant
- Molecular SystemOrganic & Biological Analytical Chemistry GroupUniversity of Liège Liège Belgium
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21
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Jia W, Liang G, Jiang Z, Wang J. Advances in Electronic Nose Development for Application to Agricultural Products. FOOD ANAL METHOD 2019. [DOI: 10.1007/s12161-019-01552-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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