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Wang Y, Tang Z, Zhao T, Yang J, Zhang W, Li X, Huan T. BreathXplorer: Processing Online Breathomics Data Generated from Direct Analysis Using High-Resolution Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2024; 35:1818-1825. [PMID: 39052287 DOI: 10.1021/jasms.4c00152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
Nontargeted breath analysis in real time using high-resolution mass spectrometry (HRMS) is a promising approach for high coverage profiling of metabolites in human exhaled breath. However, the information-rich and unique non-Gaussian metabolic signal shapes of real-time HRMS-based data pose a significant challenge for efficient data processing. This work takes a typical real-time HRMS technique as an example, i.e. secondary electrospray ionization high-resolution mass spectrometry (SESI-HRMS), and presents BreathXplorer, an open-source Python package designed for the processing of real-time exhaled breath data comprising multiple exhalations. BreathXplorer is composed of four main modules. The first module applies either a topological algorithm or a Gaussian mixture model (GMM) to determine the start and end points of each exhalation. Next, density-based spatial clustering of applications with noise (DBSCAN) is employed to cluster m/z values belonging to the same metabolic feature, followed by applying an intensity relative standard deviation (RSD) filter to extract real breath metabolic features. BreathXplorer also offers functions of (1) feature alignment across the samples and (2) associating MS/MS spectra with their corresponding metabolic features for downstream compound annotation. Manual inspection of the metabolic features extracted from SESI-HRMS breath data suggests that BreathXplorer can achieve 100% accuracy in identifying the start and end points of each exhalation and acquire accurate quantitative measurements of each breath feature. In a proof-of-concept study on exercise breathomics using SESI-HRMS, BreathXplorer successfully reveals the significantly changed metabolites that are pertinent to exercise. BreathXplorer is publicly available on GitHub (https://github.com/HuanLab/breathXplorer). It provides a powerful and convenient-to-use tool for the researchers to process breathomics data obtained by directly analysis using HRMS.
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Affiliation(s)
- Yukai Wang
- Department of Chemistry, Faculty of Science, University of British Columbia, Vancouver Campus, 2036 Main Mall, Vancouver V6T 1Z1, BC, Canada
| | - Zhifeng Tang
- Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Key Laboratory of Speed Capability Research, Jinan University, Guangzhou 510632, China
| | - Tingting Zhao
- Department of Chemistry, Faculty of Science, University of British Columbia, Vancouver Campus, 2036 Main Mall, Vancouver V6T 1Z1, BC, Canada
| | - Jianming Yang
- Guangdong Provincial Key Laboratory of Speed Capability Research; Su Bingtian Center for Speed Research and Training; School of Physical Education, Jinan University, Guangzhou 510632, China
| | - Wei Zhang
- Guangdong A-HealthX Technologies Co., Ltd, Dongguan 523830, China
| | - Xue Li
- Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Key Laboratory of Speed Capability Research, Jinan University, Guangzhou 510632, China
| | - Tao Huan
- Department of Chemistry, Faculty of Science, University of British Columbia, Vancouver Campus, 2036 Main Mall, Vancouver V6T 1Z1, BC, Canada
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Obeidat YM, Bany Hamad N, Rawashdeh AM. A solid state electrolyte based enzymatic acetone sensor. Sci Rep 2024; 14:15461. [PMID: 38965300 PMCID: PMC11224388 DOI: 10.1038/s41598-024-66498-9] [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: 03/29/2024] [Accepted: 07/02/2024] [Indexed: 07/06/2024] Open
Abstract
This paper introduces a novel solid-state electrolyte-based enzymatic sensor designed for the detection of acetone, along with an examination of its performance under various surface modifications aimed at optimizing its sensing capabilities. To measure acetone concentrations in both liquid and vapor states, cyclic voltammetry and amperometry techniques were employed, utilizing disposable screen-printed electrodes consisting of a platinum working electrode, a platinum counter electrode, and a silver reference electrode. Four different surface modifications, involving different combinations of Nafion (N) and enzyme (E) layers (N + E; N + E + N; N + N + E; N + N + E + N), were tested to identify the most effective configuration for a sensor that can be used for breath acetone detection. The sensor's essential characteristics, including linearity, sensitivity, reproducibility, and limit of detection, were thoroughly evaluated through a range of experiments spanning concentrations from 1 µM to 25 mM. Changes in acetone concentration were monitored by comparing currents readings at different acetone concentrations. The sensor exhibited high sensitivity, and a linear response to acetone concentration in both liquid and gas phases within the specified concentration range, with correlation coefficients ranging from 0.92 to 0.98. Furthermore, the sensor achieved a rapid response time of 30-50 s and an impressive detection limit as low as 0.03 µM. The results indicated that the sensor exhibited the best linearity, sensitivity, and limit of detection when four layers were employed (N + N + E + N).
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Affiliation(s)
- Yusra M Obeidat
- Department of Electronics Engineering, Hijjawi Faculty for Engineering Technology, Yarmouk University, Irbid, Jordan.
| | - Nour Bany Hamad
- Department of Chemistry, Faculty of Science and Arts, JUST University, Irbid, Jordan
| | - Abdel Monem Rawashdeh
- Department of Chemistry, Faculty of Sciences, Yarmouk University, P.O. Box 566, Irbid, Jordan
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Vinhas M, Leitão PM, Raimundo BS, Gil N, Vaz PD, Luis-Ferreira F. AI Applied to Volatile Organic Compound (VOC) Profiles from Exhaled Breath Air for Early Detection of Lung Cancer. Cancers (Basel) 2024; 16:2200. [PMID: 38927906 PMCID: PMC11201396 DOI: 10.3390/cancers16122200] [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: 05/10/2024] [Revised: 06/05/2024] [Accepted: 06/10/2024] [Indexed: 06/28/2024] Open
Abstract
Volatile organic compounds (VOCs) are an increasingly meaningful method for the early detection of various types of cancers, including lung cancer, through non-invasive methods. Traditional cancer detection techniques such as biopsies, imaging, and blood tests, though effective, often involve invasive procedures or are costly, time consuming, and painful. Recent advancements in technology have led to the exploration of VOC detection as a promising non-invasive and comfortable alternative. VOCs are organic chemicals that have a high vapor pressure at room temperature, making them readily detectable in breath, urine, and skin. The present study leverages artificial intelligence (AI) and machine learning algorithms to enhance classification accuracy and efficiency in detecting lung cancer through VOC analysis collected from exhaled breath air. Unlike other studies that primarily focus on identifying specific compounds, this study takes an agnostic approach, maximizing detection efficiency over the identification of specific compounds focusing on the overall compositional profiles and their differences across groups of patients. The results reported hereby uphold the potential of AI-driven techniques in revolutionizing early cancer detection methodologies towards their implementation in a clinical setting.
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Affiliation(s)
- Manuel Vinhas
- Departamento de Engenharia Electrotécnica e de Computadores, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte da Caparica, Portugal;
| | - Pedro M. Leitão
- Unidade de Pulmão, Centro Clínico Champalimaud, Fundação Champalimaud, Av. Brasília, 1400-038 Lisbon, Portugal; (P.M.L.); (B.S.R.); (N.G.)
| | - Bernardo S. Raimundo
- Unidade de Pulmão, Centro Clínico Champalimaud, Fundação Champalimaud, Av. Brasília, 1400-038 Lisbon, Portugal; (P.M.L.); (B.S.R.); (N.G.)
| | - Nuno Gil
- Unidade de Pulmão, Centro Clínico Champalimaud, Fundação Champalimaud, Av. Brasília, 1400-038 Lisbon, Portugal; (P.M.L.); (B.S.R.); (N.G.)
| | - Pedro D. Vaz
- Unidade de Pulmão, Centro Clínico Champalimaud, Fundação Champalimaud, Av. Brasília, 1400-038 Lisbon, Portugal; (P.M.L.); (B.S.R.); (N.G.)
| | - Fernando Luis-Ferreira
- Departamento de Engenharia Electrotécnica e de Computadores, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte da Caparica, Portugal;
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Zhang J, Xia J, Zhang Q, Yang N, Li G, Zhang F. Identification of agricultural quarantine materials in passenger's luggage using ion mobility spectroscopy combined with a convolutional neural network. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:4690-4702. [PMID: 36353817 DOI: 10.1039/d2ay01478e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
As economic globalization intensifies, the recent increase in agricultural products and travelers from abroad has led to an increase in the probability of invasive alien species. A major pathway for invasive alien species is agricultural quarantine materials (AQMs) in travelers' baggage. Thus, it is meaningful to develop efficient methods for early detection and prompt action against AQMs. In this study, a method based on the combination of odor detection of AQMs using ion mobility spectroscopy (IMS) and convolutional neural network (CNN) analysis for the identification of AQM species in luggage was developed. Two different ways were investigated to feed the IMS data of AQMs into the CNN, either as one-dimensional data (1D) (as a spectrum) or as two-dimensional data (2D) (as an IMS topographic map). The performances of CNN models were also compared to those of the commonly used classification algorithms: partial least squares discriminant analysis (PLS-DA) and soft independent modeling of class analogy (SIMCA). By doing gradient-weighted class activation mapping (Grad-CAM), the essential IMS feature regions from the CNN models to predict different AQM species were also identified. The results of this research demonstrated that the application of the CNN to the IMS data of AQMs yielded superior classification performance compared to PLS-DA and SIMCA. Especially, the CNN-2D model which utilized the IMS topographic map as input achieved the best classification accuracy both on the calibration and validation sets. In addition, the Grad-CAM method had an ability to detect critical discriminating spectral regions for different types of AQM samples, and could provide explanation for the CNNs' decision-making. Despite the inherent limitations of the present analytical protocol, the results showed that the method of IMS in combination with a CNN has great potential to be a complement for sniffer dogs and X-ray imaging techniques to detect AQMs.
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Affiliation(s)
- Jixiong Zhang
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing, 100193, China.
- National Observation and Research Station of Agriculture Green Development, Quzhou, 057250, China
| | - Jingjing Xia
- Institute of Materia Medica, Xinjiang University, Urumqi, 830017, China
| | | | - Nei Yang
- Nucteh Company Limited, Beijing, 100084, China.
| | - Guangqin Li
- Nucteh Company Limited, Beijing, 100084, China.
| | - Fusuo Zhang
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing, 100193, China.
- National Observation and Research Station of Agriculture Green Development, Quzhou, 057250, China
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Exhaled Aldehydes as Biomarkers for Lung Diseases: A Narrative Review. Molecules 2022; 27:molecules27165258. [PMID: 36014494 PMCID: PMC9415864 DOI: 10.3390/molecules27165258] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/11/2022] [Accepted: 08/12/2022] [Indexed: 11/17/2022] Open
Abstract
Breath analysis provides great potential as a fast and non-invasive diagnostic tool for several diseases. Straight-chain aliphatic aldehydes were repeatedly detected in the breath of patients suffering from lung diseases using a variety of methods, such as mass spectrometry, ion mobility spectrometry, or electro-chemical sensors. Several studies found increased concentrations of exhaled aldehydes in patients suffering from lung cancer, inflammatory and infectious lung diseases, and mechanical lung injury. This article reviews the origin of exhaled straight-chain aliphatic aldehydes, available detection methods, and studies that found increased aldehyde exhalation in lung diseases.
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Gasparri R, Capuano R, Guaglio A, Caminiti V, Canini F, Catini A, Sedda G, Paolesse R, Di Natale C, Spaggiari L. Volatolomic urinary profile analysis for diagnosis of the early stage of lung cancer. J Breath Res 2022; 16. [PMID: 35952625 DOI: 10.1088/1752-7163/ac88ec] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 08/11/2022] [Indexed: 12/24/2022]
Abstract
Nowadays in clinical practice there is a pressing need for potential biomarkers that can identify lung cancer at early stage before becoming symptomatic or detectable by conventional means. Several researchers have independently pointed out that the volatile organic compounds (VOCs) profile can be considered as a lung cancer fingerprint useful for diagnosis. In particular, 16% of volatiles contributing to the human volatilome are found in urine, which is therefore an ideal sample medium. Its analysis through non-invasive, relatively low-cost and straightforward techniques could offer great potential for the early diagnosis of lung cancer. In this study, urinary VOCs were analysed with a gas chromatography-ion mobility spectrometer (GC-IMS) and an electronic nose (e-nose) made by a matrix of twelve quartz microbalances (QMBs) complemented by a photoionization detector (PID). This clinical prospective study involved 127 individuals, divided into two groups: 46 with lung cancer stage I-II-III confirmed by computerized tomography (CT) or positron emission tomography-(PET) imaging techniques and histology (biopsy), and 81 healthy controls. Both instruments provided a multivariate signal which, after being analysed by a machine learning algorithm, identified eight VOCs that could distinguish lung cancer patients from healthy ones. The eight VOCs are 2-pentanone, 2-hexenal, 2-hexen-1-ol, hept-4-en-2-ol, 2-heptanone, 3-octen-2-one, 4-methylpentanol, 4-methyl-octane. Results show that GC-IMS identifies lung cancer with respect to the control group with a diagnostic accuracy of 88%. Sensitivity resulted as being 85%, and specificity was 90% - Area Under the Receiver Operating Characteristics (AUROC): 0.91. The contribution made by the e-nose was also important, even though the results were slightly less sensitive with an accuracy of 71.6%. Moreover, of the eight VOCs identified as potential biomarkers, five VOCs had a high sensitivity (p≤ 0.06) for early stage (stage I) lung cancer.
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Affiliation(s)
- Roberto Gasparri
- Department of Thoracic Surgery, Istituto Europeo di Oncologia, Via Giuseppe Ripamonti, 435, Milan, Milan, 20141, ITALY
| | - Rosamaria Capuano
- Department of Electronic Engineering, Universita di Roma 'Tor Vergata', via di tor Vergata 133, 00133 Roma, Roma, 00133, ITALY
| | - Alessandra Guaglio
- General toracic surgery, European Institute of Oncology, Via Ripamonti 435, 20141 Milan, Milano, Lombardia, 20141, ITALY
| | - Valentina Caminiti
- Department of Thoracic Surgery, European Institute of Oncology, Via Giuseppe Ripamonti, 435, Milan, Milan, 20141, ITALY
| | - Federico Canini
- Department of Electronic Engineering, Universita di Roma 'Tor Vergata', via di tor Vergata 133, 00133 Roma, Roma, 00133, ITALY
| | - Alexandro Catini
- Department of Electronic Engineering, Universita di Roma 'Tor Vergata', via di tor Vergata 133, 00133 Roma, Roma, 00133, ITALY
| | - Giulia Sedda
- Department of Thoracic Surgery, European Institute of Oncology, Via Giuseppe Ripamonti, 435, Milan, Milan, 20141, ITALY
| | - Roberto Paolesse
- Department of Chemical Science and Technology, Via della Ricerca Scientifica, University of Rome 'Tor Vergata', Rome, Rome, 00133, ITALY
| | - Corrado Di Natale
- Department of Electronic Engineering, Universita di Roma 'Tor Vergata', via di tor Vergata 133, 00133 Roma, Roma, 00133, ITALY
| | - Lorenzo Spaggiari
- Division of Thoracic Surgery, European Institute of Oncology, Via Ripamonti 435, Milano, Lombardia, 20141, ITALY
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Deep Learning for Type 1 Diabetes Mellitus Diagnosis Using Infrared Quantum Cascade Laser Spectroscopy. MATERIALS 2022; 15:ma15092984. [PMID: 35591319 PMCID: PMC9099836 DOI: 10.3390/ma15092984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/12/2022] [Accepted: 04/17/2022] [Indexed: 12/05/2022]
Abstract
An estimated 10.5% of the world’s population aged 20–79 years are currently living with diabetes in 2021. An urgent task is to develop a non-invasive express-diagnostics of diabetes with high accuracy. Type 1 diabetes mellitus (T1DM) diagnostic method based on infrared laser spectroscopy of human exhaled breath is described. A quantum cascade laser emitting in a pulsed mode with a peak power of up to 150 mW in the spectral range of 5.3–12.8 μm and Herriot multipass gas cell with an optical path length of 76 m were used. We propose a method for collecting and drying an exhaled human air sample and have measured 1200 infrared exhaled breath spectra from 60 healthy volunteers (the control group) and 60 volunteers with confirmed T1DM (the target group). A 1-D convolutional neural network for the classification of healthy and T1DM volunteers with an accuracy of 99.7%, recall 99.6% and AUC score 99.9% was used. The demonstrated results require clarification on a larger dataset and series of clinical studies and, further, the method can be implemented in routine medical practice.
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Kaur N, Sharma P, Aditya A, Shanavas A. Taking leads out of nature, can nano deliver us from COVID-like pandemics? Biomed Phys Eng Express 2022; 8. [PMID: 35078168 DOI: 10.1088/2057-1976/ac4ec8] [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: 10/19/2021] [Accepted: 01/25/2022] [Indexed: 11/11/2022]
Abstract
The COVID-19 crisis has alerted the research community to re-purpose scientific tools that can effectively manage emergency pandemic situations. Researchers were never so desperate to discover a 'magic bullet' that has significant clinical benefits with minimal or no side effects. At the beginning of the pandemic, due to restricted access to traditional laboratory techniques, many research groups delved into computational screening of thousands of lead molecules that could inhibit SARS-CoV-2 at one or more stages of its infectious cycle. Several in silico studies on natural derivatives point out their potency against SARS-CoV-2 proteins. However, theoretical predictions and existing knowledge on related molecules reflect their poor oral bioavailability due to biotransformation in the gut and liver. Nanotechnology has evolved into a key field for precise and controlled delivery of various drugs that lack aqueous solubility, have low oral bioavailability and possess pronounced toxicity in their native form. In this review, we discuss various nanoformulations of natural products with favorable ADME properties, and also briefly explore nano-drug delivery to lungs, the primary site of SARS-CoV-2 infection. Natural products are also envisioned to augment nanotechnology-based 1) personnel protective equipment for ex vivo viral inactivation and 2) wearable sensors that perform rapid and non-invasive analysis of volatile organic compounds in exhaled breath of the infected person after therapeutic food consumption.
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Affiliation(s)
- Navneet Kaur
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
| | - Priyanka Sharma
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
| | - Adrija Aditya
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
| | - Asifkhan Shanavas
- Institute of Nano Science and Technology, Sector 81, Knowledge city, Mohali, 140306, INDIA
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Identification of volatile compounds from bacteria by spectrometric methods in medicine diagnostic and other areas: current state and perspectives. Appl Microbiol Biotechnol 2021; 105:6245-6255. [PMID: 34415392 PMCID: PMC8377328 DOI: 10.1007/s00253-021-11469-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 07/20/2021] [Accepted: 07/22/2021] [Indexed: 10/25/2022]
Abstract
Diagnosis of bacterial infections until today mostly relies on conventional microbiological methods. The resulting long turnaround times can lead to delayed initiation of adequate antibiotic therapy and prolonged periods of empiric antibiotic therapy (e.g., in intensive care medicine). Therewith, they contribute to the mortality of bacterial infections and the induction of multidrug resistances. The detection of species specific volatile organic compounds (VOCs) emitted by bacteria has been proposed as a possible diagnostic approach with the potential to serve as an innovative point-of-care diagnostic tool with very short turnaround times. A range of spectrometric methods are available which allow the detection and quantification of bacterial VOCs down to a range of part per trillion. This narrative review introduces the application of spectrometric analytical methods for the purpose of detecting VOCs of bacterial origin and their clinical use for diagnosing different infectious conditions over the last decade. KEY POINTS: • Detection of VOCs enables bacterial differentiation in various medical conditions. • Spectrometric methods may function as point-of-care diagnostics in near future.
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Lorenz D, Maurer F, Philipp D, Albrecht F, Hüppe T, Sessler DI, Wolf B, Volk T, Kreuer S, Fink T. Changes in volatile organic compounds provoked by lipopolysaccharide- or alpha toxin-induced inflammation in ventilated rats. J Breath Res 2020; 15:016003. [PMID: 33103661 DOI: 10.1088/1752-7163/abb449] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Inflammation may alter volatile organic compounds (VOCs) in exhaled breath. We therefore used ion mobility spectrometry (IMS) to evaluate exhaled breath components in two non-infectious inflammatory models. Fifty male Sprague Dawley rats were anesthetized and ventilated for 24 h. Five treatments were randomly assigned: (1) lipopolysaccharide low dose [5 mg/kg]; (2) lipopolysaccharide high dose [10 mg/kg]; (3) alpha toxin low dose [40 µg/kg]; (4) alpha toxin high dose [80 µg/kg]; and, (5) NaCl 0.9% as control group. Gas was sampled from the expiratory line of the ventilator every 20 min and analyzed with IMS combined with a multi-capillary column. VOCs were identified by comparison with an established database. Survival analysis was performed by log-rank test, other analyses by one-way or paired ANOVA-tests and post-hoc analysis according to Holm-Sidak. Rats given NaCl and low-dose alpha toxin survived 24 h. The median survival time in alpha toxin high-dose group was 23 (95%-confidence interval (CI): 21, 24) h. In contrast, the median survival time in rats given high-dose lipopolysaccharide was 12 (95% CI: 9, 14) and only 13 (95% CI: 10, 16) h in those given high-dose lipopolysaccharide. 73 different VOCs were detected, of which 35 were observed only in the rats, 38 could be found both in the blank measurements of ventilator air and in the exhaled air of the rats. Forty-nine of the VOCs were identifiable from a registry of compounds. Exhaled volatile compounds were comparable in each group before injection of lipopolysaccharide and alpha toxin. In the LPS groups, 1-pentanol increased and 2-propanol decreased. After alpha toxin treatment, 1-butanol and 1-pentanol increased whereas butanal and isopropylamine decreased. Induction of a non-infectious systemic inflammation (niSI) by lipopolysaccharide and alpha toxin changes VOCs in exhaled breath. Exhalome analysis may help identify niSI.
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Affiliation(s)
- Dominik Lorenz
- CBR - Center of Breath Research, Department of Anaesthesiology, Intensive Care and Pain Therapy, Saarland University Medical Center and Saarland University Faculty of Medicine, Building 57, 66421, Homburg, Germany
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Kulas P, Seidel M, Bozzato A, Schick B, Sessler DI, Kreuer S, Hüppe T. Volatile organic compounds in head and neck squamous cell carcinoma-An in vitro pilot study. Biomed Chromatogr 2020; 34:e4811. [PMID: 32059060 DOI: 10.1002/bmc.4811] [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: 09/22/2019] [Revised: 02/02/2020] [Accepted: 02/11/2020] [Indexed: 11/07/2022]
Abstract
Owing to the lack of specific symptoms, diagnosis of head and neck squamous cell carcinoma (HNSCC) may be delayed. We evaluated volatile organic compounds in tumor samples from patients suffering from HNSCC and tested the hypothesis that there is a characteristic altered composition in the headspace of HNSCC compared with control samples from the same patient with normal squamous epithelium. These results provide the basis for future noninvasive breath analysis in HNSCC. Headspace air of suspected tumor and contralateral control samples in 20 patients were analyzed using ion-mobility spectrometry. Squamous cell carcinoma was diagnosed in 16 patients. In total, we observed 93 different signals in headspace measurements. Squamous cell carcinomas revealed significantly higher levels of volatile cyclohexanol (0.54 ppbv , 25th to 75th percentiles 0.35-0.86) compared with healthy squamous epithelium (0.24 ppbv , 25th to 75th percentiles 0.12-0.3; p < 0.001). In conclusion, head and neck squamous cell carcinoma emitted significantly higher levels of volatile cyclohexanol in headspace compared with normal squamous epithelium. These findings form the basis for future breath analysis for diagnosis, therapy control and the follow-up of HNSSC to improve therapy and aftercare.
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Affiliation(s)
- Philipp Kulas
- Department of Otorhinolaryngology, Head and Neck Surgery, Saarland University Medical Center, Homburg (Saar), Germany
| | - Martin Seidel
- Center of Breath Research, Department of Anesthesiology, Intensive Care and Pain Therapy, Saarland University Medical Center, Homburg (Saar), Germany
| | - Alessandro Bozzato
- Department of Otorhinolaryngology, Head and Neck Surgery, Saarland University Medical Center, Homburg (Saar), Germany
| | - Bernhard Schick
- Department of Otorhinolaryngology, Head and Neck Surgery, Saarland University Medical Center, Homburg (Saar), Germany
| | - Daniel I Sessler
- Department of Outcomes Research, Anesthesiology Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Sascha Kreuer
- Center of Breath Research, Department of Anesthesiology, Intensive Care and Pain Therapy, Saarland University Medical Center, Homburg (Saar), Germany
| | - Tobias Hüppe
- Center of Breath Research, Department of Anesthesiology, Intensive Care and Pain Therapy, Saarland University Medical Center, Homburg (Saar), Germany
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Volatile Organic Compounds in Patients With Acute Kidney Injury and Changes During Dialysis. Crit Care Med 2019; 47:239-246. [PMID: 30365402 DOI: 10.1097/ccm.0000000000003523] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVES To characterize volatile organic compounds in breath exhaled by ventilated care patients with acute kidney injury and changes over time during dialysis. DESIGN Prospective observational feasibility study. SETTING Critically ill patients on an ICU in a University Hospital, Germany. PATIENTS Twenty sedated, intubated, and mechanically ventilated patients with acute kidney injury and indication for dialysis. INTERVENTIONS Patients exhalome was evaluated from at least 30 minutes before to 7 hours after beginning of continuous venovenous hemodialysis. MEASUREMENTS AND MAIN RESULTS Expired air samples were aspirated from the breathing circuit at 20-minute intervals and analyzed using multicapillary column ion-mobility spectrometry. Volatile organic compound intensities were compared with a ventilated control group with normal renal function. A total of 60 different signals were detected by multicapillary column ion-mobility spectrometry, of which 44 could be identified. Thirty-four volatiles decreased during hemodialysis, whereas 26 remained unaffected. Forty-five signals showed significant higher intensities in patients with acute kidney injury compared with control patients with normal renal function. Among these, 30 decreased significantly during hemodialysis. Volatile cyclohexanol (23 mV; 2575th, 19-38), 3-hydroxy-2-butanone (16 mV, 9-26), 3-methylbutanal (20 mV; 14-26), and dimer of isoprene (26 mV; 18-32) showed significant higher intensities in acute kidney impairment compared with control group (12 mV; 10-16 and 8 mV; 7-14 and not detectable and 4 mV; 0-6; p < 0.05) and a significant decline after 7 hours of continuous venovenous hemodialysis (16 mV; 13-21 and 7 mV; 6-13 and 9 mV; 8-13 and 14 mV; 10-19). CONCLUSIONS Exhaled concentrations of 45 volatile organic compounds were greater in critically ill patients with acute kidney injury than in patients with normal renal function. Concentrations of two-thirds progressively decreased during dialysis. Exhalome analysis may help quantify the severity of acute kidney injury and to gauge the efficacy of dialysis.
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Gorbunov IS, Gubal’ AR, Ganeev AA, Rodinkov OV, Kartsova LA, Bessonova EA, Arsen’ev AI, Nefedov AO, Kraeva LA. Optimization of the Conditions of Analysis of Exhaled Air by Gas Chromatography–Mass Spectrometry for the Noninvasive Diagnostics of Lung Cancer. JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1134/s1061934819110042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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14
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Hybrid Analytical Platform Based on Field-Asymmetric Ion Mobility Spectrometry, Infrared Sensing, and Luminescence-Based Oxygen Sensing for Exhaled Breath Analysis. SENSORS 2019; 19:s19122653. [PMID: 31212768 PMCID: PMC6630267 DOI: 10.3390/s19122653] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/07/2019] [Accepted: 06/09/2019] [Indexed: 12/19/2022]
Abstract
The reliable online analysis of volatile compounds in exhaled breath remains a challenge, as a plethora of molecules occur in different concentration ranges (i.e., ppt to %) and need to be detected against an extremely complex background matrix. Although this complexity is commonly addressed by hyphenating a specific analytical technique with appropriate preconcentration and/or preseparation strategies prior to detection, we herein propose the combination of three different detector types based on truly orthogonal measurement principles as an alternative solution: Field-asymmetric ion mobility spectrometry (FAIMS), Fourier-transform infrared (FTIR) spectroscopy-based sensors utilizing substrate-integrated hollow waveguides (iHWG), and luminescence sensing (LS). By carefully aligning the experimental needs and measurement protocols of all three methods, they were successfully integrated into a single compact analytical platform suitable for online measurements. The analytical performance of this prototype system was tested via artificial breath samples containing nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and acetone as a model volatile organic compound (VOC) commonly present in breath. All three target analytes could be detected within their respectively breath-relevant concentration range, i.e., CO2 and O2 at 3-5 % and at ~19.6 %, respectively, while acetone could be detected with LOQs as low as 165-405 ppt. Orthogonality of the three methods operating in concert was clearly proven, which is essential to cover a possibly wide range of detectable analytes. Finally, the remaining challenges toward the implementation of the developed hybrid FAIMS-FTIR-LS system for exhaled breath analysis for metabolic studies in small animal intensive care units are discussed.
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Horsch S, Baumbach JI, Rahnenführer J. Statistical analysis of MCC-IMS data for two group comparisons-an exemplary study on two devices. J Breath Res 2019; 13:036011. [PMID: 31048567 DOI: 10.1088/1752-7163/ab1ee2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The Multi-capillary-column-Ion-mobility-spectrometry (MCC-IMS) technology for measuring breath gas can be used for distinguishing between healthy and diseased subjects or between different types of diseases. The statistical methods for classifying the corresponding breath samples typically neglects potential confounding clinical and technical variables, reducing both accuracy and generalizability of the results. Especially measuring samples on different technical devices can heavily influence the results. We conducted a controlled breath gas study including 49 healthy volunteers to evaluate the effect of the variables sex, smoking habits and technical device. Every person was measured twice, once before and once after consuming a glass of orange juice. The two measurements were obtained on two different devices. The evaluation of the MCC-IMS data regarding metabolite detection was performed once using the software VisualNow, which requires manual interaction, and once using the fully automated algorithm SGLTR-DBSCAN. We present statistical solutions, peak alignment and scaling, to adjust for the different devices. For the other potential confounders sex and smoking, in our study no significant influence was identified.
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Affiliation(s)
- S Horsch
- Department of Statistics, TU Dortmund, D-44221, Dortmund, Germany
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Pu D, Zhang H, Zhang Y, Sun B, Ren F, Chen H, He J. Characterization of the aroma release and perception of white bread during oral processing by gas chromatography-ion mobility spectrometry and temporal dominance of sensations analysis. Food Res Int 2019; 123:612-622. [PMID: 31285010 DOI: 10.1016/j.foodres.2019.05.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 05/08/2019] [Accepted: 05/12/2019] [Indexed: 11/24/2022]
Abstract
The purpose of this study was to investigate the aroma release and perception from white bread during oral processing by gas chromatography-ion mobility spectrometry (GC-IMS) and dynamic sensory evaluation of temporal dominance of sensations (TDS). TDS curves indicated that two maximum aroma perception signals, fermentation-like and flour-like attributes, were perceived at the beginning and swallowing, respectively. The fermentation-like, flour-like, and sour attributes were the 3 dominant aromas during oral processing. A total of 35 volatile compounds were detected in the mouth cavity during chewing white bread, 19 of them were confirmed and quantified by using the respective external standard. Based on PLSR analysis, 8 aroma compounds were predicted as potent odorants contributing to the aroma perception from chewing white bread. By application of odor activity values analysis and addition experiments, ethyl butanoate, butyl acetate, hexanal, 3-(methylthio)-propanal, 3-methylbutanal, and 2,3-butanedione were confirmed as the key odorants contributing to the aroma perception during chewing of white bread.
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Affiliation(s)
- Dandan Pu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China; Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University (BTBU), Beijing 100048, China.
| | - Huiying Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China; Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University (BTBU), Beijing 100048, China.
| | - Yuyu Zhang
- Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University (BTBU), Beijing 100048, China.
| | - Baoguo Sun
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China; Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University (BTBU), Beijing 100048, China.
| | - Fazheng Ren
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China.
| | - Haitao Chen
- Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University (BTBU), Beijing 100048, China.
| | - Jinna He
- Shandong Hanon Instruments Co., Ltd., Dezhou 253000, China
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Kirk AT, Bohnhorst A, Raddatz CR, Allers M, Zimmermann S. Ultra-high-resolution ion mobility spectrometry-current instrumentation, limitations, and future developments. Anal Bioanal Chem 2019; 411:6229-6246. [PMID: 30957205 DOI: 10.1007/s00216-019-01807-0] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 03/15/2019] [Accepted: 03/25/2019] [Indexed: 12/29/2022]
Abstract
With recent advances in ionization sources and instrumentation, ion mobility spectrometers (IMS) have transformed from a detector for chemical warfare agents and explosives to a widely used tool in analytical and bioanalytical applications. This increasing measurement task complexity requires higher and higher analytical performance and especially ultra-high resolution. In this review, we will discuss the currently used ion mobility spectrometers able to reach such ultra-high resolution, defined here as a resolving power greater than 200. These instruments are drift tube IMS, traveling wave IMS, trapped IMS, and field asymmetric or differential IMS. The basic operating principles and the resulting effects of experimental parameters on resolving power are explained and compared between the different instruments. This allows understanding the current limitations of resolving power and how ion mobility spectrometers may progress in the future. Graphical abstract.
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Affiliation(s)
- Ansgar T Kirk
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstr. 9A, 30167, Hannover, Germany.
| | - Alexander Bohnhorst
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstr. 9A, 30167, Hannover, Germany
| | - Christian-Robert Raddatz
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstr. 9A, 30167, Hannover, Germany
| | - Maria Allers
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstr. 9A, 30167, Hannover, Germany
| | - Stefan Zimmermann
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover, Appelstr. 9A, 30167, Hannover, Germany
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18
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Umapathy S, Nasimsha N, Kumar M, Kalidoss R, Thomas AC, Lakshmi M, Gafoor ER. Design and development of portable prototype for human breath analysis: a comparative study between haemodialysis patients and healthy subjects. Biomed Phys Eng Express 2019. [DOI: 10.1088/2057-1976/ab005c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Steinbach J, Goedicke-Fritz S, Tutdibi E, Stutz R, Kaiser E, Meyer S, Baumbach JI, Zemlin M. Bedside Measurement of Volatile Organic Compounds in the Atmosphere of Neonatal Incubators Using Ion Mobility Spectrometry. Front Pediatr 2019; 7:248. [PMID: 31275910 PMCID: PMC6591267 DOI: 10.3389/fped.2019.00248] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 05/30/2019] [Indexed: 11/17/2022] Open
Abstract
Background: Early and non-invasive diagnosis of common diseases is of great importance in the care of preterm infants. We hypothesized that volatile organic compounds (VOC) can be successfully measured in the neonatal incubator atmosphere. Methods: This is a feasibility study to investigate whether the discrimination of occupied and unoccupied neonatal incubators is possible by bedside measurement of volatile organic compounds (VOCs) on the neonatal intensive care unit. VOC profiles were measured in the incubator air using ion mobility spectrometry coupled to multi-capillary columns (BreathDiscovery B&S Analytik GmbH, Dortmund, Germany). Results: Seventeen incubators occupied by preterm infants (50 measurements) and nine unoccupied neonatal incubators were sampled, using 37 room air measurements as controls. Three VOC signals that allow the discrimination between occupied and unoccupied incubators were identified. The best discrimination was reached by peak P20 exhibiting a sensitivity, specificity, positive predictive value and negative predictive value of 94.0, 88.9, 97.3, and 72.3%, respectively. Use of a decision tree improved these values to 100.0, 88.9, 98.0, and 100.0%, respectively. Discussion: A bedside method that allows the characterization of VOC profiles in the neonatal incubator atmosphere using ion mobility spectrometry was established. Occupied and unoccupied incubators could be discriminated by characterizing VOC profiles. This technique has the potential to yield results within minutes. Thus, future studies are recommended to test the hypothesis that VOCs within neonatal incubators are useful biomarkers for non-invasive diagnostics in preterm neonates.
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Affiliation(s)
- Julia Steinbach
- Department of Applied Chemistry, Reutlingen University, Reutlingen, Germany
| | - Sybelle Goedicke-Fritz
- Department of General Paediatrics and Neonatology, Saarland University Medical School, Homburg, Germany
| | - Erol Tutdibi
- Department of General Paediatrics and Neonatology, Saarland University Medical School, Homburg, Germany
| | - Regine Stutz
- Department of General Paediatrics and Neonatology, Saarland University Medical School, Homburg, Germany
| | - Elisabeth Kaiser
- Department of General Paediatrics and Neonatology, Saarland University Medical School, Homburg, Germany
| | - Sascha Meyer
- Department of General Paediatrics and Neonatology, Saarland University Medical School, Homburg, Germany
| | - Jörg Ingo Baumbach
- Department of Applied Chemistry, Reutlingen University, Reutlingen, Germany
| | - Michael Zemlin
- Department of General Paediatrics and Neonatology, Saarland University Medical School, Homburg, Germany
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20
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Wallace MAG, Pleil JD. Evolution of clinical and environmental health applications of exhaled breath research: Review of methods and instrumentation for gas-phase, condensate, and aerosols. Anal Chim Acta 2018; 1024:18-38. [PMID: 29776545 PMCID: PMC6082128 DOI: 10.1016/j.aca.2018.01.069] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 01/29/2018] [Accepted: 01/31/2018] [Indexed: 12/20/2022]
Abstract
Human breath, along with urine and blood, has long been one of the three major biological media for assessing human health and environmental exposure. In fact, the detection of odor on human breath, as described by Hippocrates in 400 BC, is considered the first analytical health assessment tool. Although less common in comparison to contemporary bio-fluids analyses, breath has become an attractive diagnostic medium as sampling is non-invasive, unlimited in timing and volume, and does not require clinical personnel. Exhaled breath, exhaled breath condensate (EBC), and exhaled breath aerosol (EBA) are different types of breath matrices used to assess human health and disease state. Over the past 20 years, breath research has made many advances in assessing health state, overcoming many of its initial challenges related to sampling and analysis. The wide variety of sampling techniques and collection devices that have been developed for these media are discussed herein. The different types of sensors and mass spectrometry instruments currently available for breath analysis are evaluated as well as emerging breath research topics, such as cytokines, security and airport surveillance, cellular respiration, and canine olfaction.
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Affiliation(s)
- M Ariel Geer Wallace
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC, 27711, USA.
| | - Joachim D Pleil
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC, 27711, USA.
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21
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Jurado-Campos N, Garrido-Delgado R, Martínez-Haya B, Eiceman GA, Arce L. Stability of proton-bound clusters of alkyl alcohols, aldehydes and ketones in Ion Mobility Spectrometry. Talanta 2018; 185:299-308. [DOI: 10.1016/j.talanta.2018.03.030] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 03/06/2018] [Accepted: 03/11/2018] [Indexed: 10/17/2022]
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22
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Halbfeld C, Baumbach JI, Blank LM, Ebert BE. Multi-capillary Column Ion Mobility Spectrometry of Volatile Metabolites for Phenotyping of Microorganisms. Methods Mol Biol 2018; 1671:229-258. [PMID: 29170963 DOI: 10.1007/978-1-4939-7295-1_15] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Rational strain engineering requires solid testing of phenotypes including productivity and ideally contributes thereby directly to our understanding of the genotype-phenotype relationship. Actually, the test step of the strain engineering cycle becomes the limiting step, as ever advancing tools for generating genetic diversity exist. Here, we briefly define the challenge one faces in quantifying phenotypes and summarize existing analytical techniques that partially overcome this challenge. We argue that the evolution of volatile metabolites can be used as proxy for cellular metabolism. In the simplest case, the product of interest is a volatile (e.g., from bulk alcohols to special fragrances) that is directly quantified over time. But also nonvolatile products (e.g., from bulk long-chain fatty acids to natural products) require major flux rerouting that result potentially in altered volatile production. While alternative techniques for volatile determination exist, rather few can be envisaged for medium to high-throughput analysis required for phenotype testing. Here, we contribute a detailed protocol for an ion mobility spectrometry (IMS) analysis that allows volatile metabolite quantification down to the ppb range. The sensitivity can be exploited for small-scale fermentation monitoring. The insights shared might contribute to a more frequent use of IMS in biotechnology, while the experimental aspects are of general use for researchers interested in volatile monitoring.
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Affiliation(s)
- Christoph Halbfeld
- iAMB-Institute of Applied Microbiology, ABBt-Aachen Biology and Biotechnology, RWTH Aachen University, Worringer Weg 1, 52074, Aachen, Germany
| | - Jörg Ingo Baumbach
- Faculty of Applied Chemistry, Reutlingen University, 72762, Reutlingen, Germany
| | - Lars M Blank
- iAMB-Institute of Applied Microbiology, ABBt-Aachen Biology and Biotechnology, RWTH Aachen University, Worringer Weg 1, 52074, Aachen, Germany.
| | - Birgitta E Ebert
- iAMB-Institute of Applied Microbiology, ABBt-Aachen Biology and Biotechnology, RWTH Aachen University, Worringer Weg 1, 52074, Aachen, Germany
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23
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Winters BR, Pleil JD, Boyer JC, Nylander-French LA, Wallace MAG, Madden MC. Review: Endogenously Produced Volatiles for In Vitro Toxicity Testing Using Cell Lines. APPLIED IN VITRO TOXICOLOGY 2018; 4:129-138. [PMID: 31037250 PMCID: PMC5994904 DOI: 10.1089/aivt.2017.0038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Due to the ∼86,000 chemicals registered under the Toxic Substances Control Act and increasing ethical concerns regarding animal testing, it is not economically or technically feasible to screen every registered chemical for toxicity using animal-based toxicity assays. To address this challenge, regulatory agencies are investigating high-throughput screening in vitro methods to increase speed of toxicity testing, while reducing the overall cost. One approach for rapid toxicity testing currently being investigated is monitoring of volatile emissions produced by cell lines in culture. Such a metabolomics approach would measure gaseous emissions from a cell line and determine if such gaseous metabolites are altered upon exposure to a xenobiotic. Herein, we describe the history and rationale of monitoring endogenously produced volatiles for identification of pathologic conditions, as well as emerging applications in toxicity testing for such an approach.
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Affiliation(s)
- Brett R. Winters
- Curriculum in Toxicology, University of North Carolina, Chapel Hill, North Carolina
| | - Joachim D. Pleil
- Exposure Methods and Measurements Division, NERL/ORD, United States Environmental Protection Agency, Research Triangle Park, North Carolina
| | - Jayne C. Boyer
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina
| | - Leena A. Nylander-French
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina
| | - M. Ariel Geer Wallace
- Exposure Methods and Measurements Division, NERL/ORD, United States Environmental Protection Agency, Research Triangle Park, North Carolina
| | - Michael C. Madden
- Environmental Public Health Division, NHEERL/ORD, United States Environmental Protection Agency, Research Triangle Park, North Carolina
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24
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Guo K, Ni K, Song X, Li K, Tang B, Yu Q, Qian X, Wang X. Ion Distribution Profiling in an Ion Mobility Spectrometer by Laser-Induced Fluorescence. Anal Chem 2018; 90:4514-4520. [PMID: 29488746 DOI: 10.1021/acs.analchem.7b04912] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Measuring the ion distribution pattern in a drift tube under atmospheric pressure is very useful for studies of ion motion and design of ion mobility spectrometers (IMS); however, no mature method is available for conducting such measurements at present. We propose a simple and low-cost technique for profiling the two-dimensional ion distribution in any cross section of a drift tube. Similar to particle-image velocimetry, we first send sample ions with fluorescence properties into the drift tube and use a receiving plate to collect and accumulate them. Then, the receiving plate is illuminated by exciting light, and the ion distribution appears as a fluorescence image. In this study, Rhodamine 6G was selected as a typical fluorescence-tracer particle. Electrospray ionization (ESI) was chosen as an ionization source to keep the fluorophore undamaged. A plasma-cleaned coverslip was placed at the detection position as a receiving plate. When a layer of ions was collected, the slide was placed under the exciting light with a wavelength of 473 nm. A camera with a 490 nm high-pass light filter was used to capture the fluorescence image representing the ion distribution. The measured-ion detection efficiency of the method was 156 ion/dN, which is equivalent to the level of IonCCD. In addition, we studied the ion-passing characteristics of a Bradbury-Nielsen (BN) ion shutter and the ion-focusing effect in the drift tube using this method. The two-dimensional ion-distribution images behind the ion shutter and the images of the focused ion spot were first observed experimentally. Further theoretical analysis yielded the same conclusions as the experimental results, proving the feasibility of this method and producing a deeper understanding of ion motion in the IMS. This method has promising prospective application to the design, debugging, and optimization of IMS instruments and hyphenated systems.
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Affiliation(s)
- Kaitai Guo
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Kai Ni
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Xiangxiang Song
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Kunxiao Li
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Binchao Tang
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Quan Yu
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Xiang Qian
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China
| | - Xiaohao Wang
- Division of Advanced Manufacturing, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China.,State Key Laboratory of Precision Measure Technology and Instruments , Tsinghua University , Beijing 100084 , China
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Abstract
INTRODUCTION Human breath can contain thousands of volatile organic compounds (VOCs) and semi-volatile compounds that are related to metabolism and other biochemical processes. The presence of cancer cells can affect the identity and abundances of chemicals in breath when compared to those in healthy control subjects, which can be used to indicate the likelihood of a patient having cancer. Recently, the chemical analysis of exhaled breath from patients has been shown to be promising for diagnosing many different types of cancers, including lung, breast, colon, head, neck, and prostate, along with pre-cancerous conditions (dysplasia). AREAS COVERED Here, we reviewed the sampling, analytical and data analysis methods reported in the recent patent literature related to cancer breath testing (2014-2017). In addition, the different types of cancer biomarkers that were disclosed are discussed. EXPERT OPINION The major advantages of breath testing compared to conventional X-ray and imaging based methods includes simplicity of use, non-invasiveness, and the potential to detect cancer at a relatively early stage. Such methods are also suitable to perform population screening because of their non-invasiveness. However, the establishment of standard sampling, detection and quantification methods for breath testing is required before the methods can be employed for clinical diagnosis.
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Affiliation(s)
- K M Mohibul Kabir
- a School of Chemistry , University of New South Wales, NSW , Sydney , Australia
| | - William A Donald
- a School of Chemistry , University of New South Wales, NSW , Sydney , Australia
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Bohnhorst A, Kirk AT, Berger M, Zimmermann S. Fast Orthogonal Separation by Superposition of Time of Flight and Field Asymmetric Ion Mobility Spectrometry. Anal Chem 2017; 90:1114-1121. [PMID: 29271643 DOI: 10.1021/acs.analchem.7b03200] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Ion mobility spectrometry is a powerful and low-cost technique for the identification of chemical warfare agents, toxic chemicals, or explosives in air. Drift tube ion mobility spectrometers (DT-IMS) separate ions by the absolute value of their low field ion mobility, while field asymmetric ion mobility spectrometers (FAIMS) separate them by the change of their ion mobility at high fields. However, using one of these devices alone, some common and harmless substances show the same response as the hazardous target substances. In order to increase the selectivity, orthogonal data are required. Thus, in this work, we present for the first time an ambient pressure ion mobility spectrometer which is able to separate ions both by their differential and low field mobility, providing additional information for selectivity enhancement. This novel field asymmetric time of flight ion mobility spectrometer (FAT-IMS) allows high repetition rates and reaches limits of detection in the low ppb range common for DT-IMS. The device consists of a compact 44 mm drift tube with a tritium ionization source and a resolving power of 70. An increased separation of four substances with similar low field ion mobility is shown: phosgene (K0 = 2.33 cm2/(V s)), 1,1,2-trichlorethane (K0 = 2.31 cm2/(V s)), chlorine (K0 = 2.24 cm2/(V s)), and nitrogen dioxide (K0 = 2.25 cm2/(V s)). Furthermore, the behavior and limits of detection for acetonitrile, dimethyl methylphosphonate, diisopropyl methyl phosphonate in positive polarity and carbon dioxide, sulfur dioxide, hydrochloric acid, cyanogen chloride, and hydrogen cyanide in negative polarity are investigated.
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Affiliation(s)
- Alexander Bohnhorst
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover , Appelstrasse 9A, 30167 Hannover, Germany
| | - Ansgar T Kirk
- Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Leibniz Universität Hannover , Appelstrasse 9A, 30167 Hannover, Germany
| | - Marc Berger
- 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
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Costanzo MT, Boock JJ, Kemperman RHJ, Wei MS, Beekman CR, Yost RA. Portable FAIMS: Applications and Future Perspectives. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 2017; 422:188-196. [PMID: 29335669 PMCID: PMC5765550 DOI: 10.1016/j.ijms.2016.12.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Miniaturized mass spectrometry (MMS) is optimal for a wide variety of applications that benefit from field-portable instrumentation. Like MMS, field asymmetric ion mobility spectrometry (FAIMS) has proven capable of providing in situ analysis, allowing researchers to bring the lab to the sample. FAIMS compliments MMS very well, but has the added benefit of operating at atmospheric pressure, unlike MS. This distinct advantage makes FAIMS uniquely suited for portability. Since its inception, FAIMS has been envisioned as a field-portable device, as it affords less expense and greater simplicity than many similar methods. Ideally, these are simple, robust devices that may be operated by non-professional personnel, yet still provide adequate data when in the field. While reducing the size and complexity tends to bring with it a loss of performance and accuracy, this is made up for by the incredibly high throughput and overall convenience of the instrument. Moreover, the FAIMS device used in the field can be brought back to the lab, and coupled to a conventional mass spectrometer to provide any necessary method development and compound validation. This work discusses the various considerations, uses, and applications for portable FAIMS instrumentation, and how the future of each applicable field may benefit from the development and acceptance of such a device.
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Affiliation(s)
| | | | | | - Michael S. Wei
- Department of Chemistry; University of Florida; Gainesville, FL 32611
| | | | - Richard A. Yost
- Department of Chemistry; University of Florida; Gainesville, FL 32611
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28
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Ahmed WM, Lawal O, Nijsen TM, Goodacre R, Fowler SJ. Exhaled Volatile Organic Compounds of Infection: A Systematic Review. ACS Infect Dis 2017; 3:695-710. [PMID: 28870074 DOI: 10.1021/acsinfecdis.7b00088] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
With heightened global concern of microbial drug resistance, advanced methods for early and accurate diagnosis of infection are urgently needed. Analysis of exhaled breath volatile organic compounds (VOCs) toward detecting microbial infection potentially allows a highly informative and noninvasive alternative to current genomics and culture-based methods. We performed a systematic review of research literature reporting human and animal exhaled breath VOCs related to microbial infections. In this Review, we find that a wide range of breath sampling and analysis methods are used by researchers, which significantly affects interstudy method comparability. Studies either perform targeted analysis of known VOCs relating to an infection, or non-targeted analysis to obtain a global profile of volatile metabolites. In general, the field of breath analysis is still relatively immature, and there is much to be understood about the metabolic production of breath VOCs, particularly in a host where both commensal microflora as well as pathogenic microorganisms may be manifested in the airways. We anticipate that measures to standardize high throughput sampling and analysis, together with an increase in large scale collaborative international trials, will bring routine breath VOC analysis to improve diagnosis of infection closer to reality.
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Affiliation(s)
- Waqar M. Ahmed
- Division of Infection, Immunity & Respiratory Medicine, School of Biological Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
- Philips
Research, Royal Philips B.V., High Tech Campus 34, Eindhoven, 5656 AE, The Netherlands
| | - Oluwasola Lawal
- Division of Infection, Immunity & Respiratory Medicine, School of Biological Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
- Philips
Research, Royal Philips B.V., High Tech Campus 34, Eindhoven, 5656 AE, The Netherlands
| | - Tamara M. Nijsen
- Philips
Research, Royal Philips B.V., High Tech Campus 34, Eindhoven, 5656 AE, The Netherlands
| | - Royston Goodacre
- School of
Chemistry, Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
| | - Stephen J. Fowler
- Division of Infection, Immunity & Respiratory Medicine, School of Biological Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
- Manchester
Academic Health Science Centre, University Hospital of South Manchester NHS Foundation Trust, Southmoor Road, Wythenshawe, Manchester, M23 9LT, United Kingdom
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Horsch S, Kopczynski D, Kuthe E, Baumbach JI, Rahmann S, Rahnenführer J. A detailed comparison of analysis processes for MCC-IMS data in disease classification-Automated methods can replace manual peak annotations. PLoS One 2017; 12:e0184321. [PMID: 28910313 PMCID: PMC5598980 DOI: 10.1371/journal.pone.0184321] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 08/22/2017] [Indexed: 11/24/2022] Open
Abstract
Motivation Disease classification from molecular measurements typically requires an analysis pipeline from raw noisy measurements to final classification results. Multi capillary column—ion mobility spectrometry (MCC-IMS) is a promising technology for the detection of volatile organic compounds in the air of exhaled breath. From raw measurements, the peak regions representing the compounds have to be identified, quantified, and clustered across different experiments. Currently, several steps of this analysis process require manual intervention of human experts. Our goal is to identify a fully automatic pipeline that yields competitive disease classification results compared to an established but subjective and tedious semi-manual process. Method We combine a large number of modern methods for peak detection, peak clustering, and multivariate classification into analysis pipelines for raw MCC-IMS data. We evaluate all combinations on three different real datasets in an unbiased cross-validation setting. We determine which specific algorithmic combinations lead to high AUC values in disease classifications across the different medical application scenarios. Results The best fully automated analysis process achieves even better classification results than the established manual process. The best algorithms for the three analysis steps are (i) SGLTR (Savitzky-Golay Laplace-operator filter thresholding regions) and LM (Local Maxima) for automated peak identification, (ii) EM clustering (Expectation Maximization) and DBSCAN (Density-Based Spatial Clustering of Applications with Noise) for the clustering step and (iii) RF (Random Forest) for multivariate classification. Thus, automated methods can replace the manual steps in the analysis process to enable an unbiased high throughput use of the technology.
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Affiliation(s)
- Salome Horsch
- Department of Statistics, TU Dortmund University, Dortmund, Germany
| | - Dominik Kopczynski
- Bioinformatics, Computer Science XI, TU Dortmund University, Dortmund, Germany
| | - Elias Kuthe
- Genome Informatics, Institute of Human Genetics, University of Duisburg-Essen, University Hospital Essen, Essen, Germany
| | - Jörg Ingo Baumbach
- Faculty of Applied Chemistry, Reutlingen University, Reutlingen, Germany
| | - Sven Rahmann
- Bioinformatics, Computer Science XI, TU Dortmund University, Dortmund, Germany
- Genome Informatics, Institute of Human Genetics, University of Duisburg-Essen, University Hospital Essen, Essen, Germany
| | - Jörg Rahnenführer
- Department of Statistics, TU Dortmund University, Dortmund, Germany
- * E-mail:
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Hüppe T, Lorenz D, Wachowiak M, Maurer F, Meiser A, Groesdonk H, Fink T, Sessler DI, Kreuer S. Volatile organic compounds in ventilated critical care patients: a systematic evaluation of cofactors. BMC Pulm Med 2017; 17:116. [PMID: 28830533 PMCID: PMC5567647 DOI: 10.1186/s12890-017-0460-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 08/11/2017] [Indexed: 01/26/2023] Open
Abstract
Background Expired gas (exhalome) analysis of ventilated critical ill patients can be used for drug monitoring and biomarker diagnostics. However, it remains unclear to what extent volatile organic compounds are present in gases from intensive care ventilators, gas cylinders, central hospital gas supplies, and ambient air. We therefore systematically evaluated background volatiles in inspired gas and their influence on the exhalome. Methods We used multi-capillary column ion-mobility spectrometry (MCC-IMS) breath analysis in five mechanically ventilated critical care patients, each over a period of 12 h. We also evaluated volatile organic compounds in inspired gas provided by intensive care ventilators, in compressed air and oxygen from the central gas supply and cylinders, and in the ambient air of an intensive care unit. Volatiles detectable in both inspired and exhaled gas with patient-to-inspired gas ratios < 5 were defined as contaminating compounds. Results A total of 76 unique MCC-IMS signals were detected, with 39 being identified volatile compounds: 73 signals were from the exhalome, 12 were identified in inspired gas from critical care ventilators, and 34 were from ambient air. Five volatile compounds were identified from the central gas supply, four from compressed air, and 17 from compressed oxygen. We observed seven contaminating volatiles with patient-to-inspired gas ratios < 5, thus representing exogenous signals of sufficient magnitude that might potentially be mistaken for exhaled biomarkers. Conclusions Volatile organic compounds can be present in gas from central hospital supplies, compressed gas tanks, and ventilators. Accurate assessment of the exhalome in critical care patients thus requires frequent profiling of inspired gases and appropriate normalisation of the expired signals.
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Affiliation(s)
- Tobias Hüppe
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany.
| | - Dominik Lorenz
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany
| | - Mario Wachowiak
- Department of Anaesthesiology and Intensive Care, Klinikum Lünen St.-Marien-Hospital, Lünen, Germany
| | - Felix Maurer
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany
| | - Andreas Meiser
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany
| | - Heinrich Groesdonk
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany
| | - Tobias Fink
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany
| | - Daniel I Sessler
- Department of Outcomes Research, Anesthesiology Institute, ASCleveland Clinic, Cleveland, OH, USA
| | - Sascha Kreuer
- Department of Anaesthesiology, Intensive Care and Pain Therapy, Centre of Breath Research, Saarland University Medical Centre, Kirrberger Strasse 100, 66421, Homburg (Saar), Germany
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Schwarz EI, Engler A, Kohler M. Exhaled breath analysis in obstructive sleep apnea. Expert Rev Respir Med 2017; 11:631-639. [DOI: 10.1080/17476348.2017.1338950] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Esther I Schwarz
- Sleep Disorders Center and Pulmonary Division, University Hospital of Zurich, Zurich, Switzerland
| | - Anna Engler
- Sleep Disorders Center and Pulmonary Division, University Hospital of Zurich, Zurich, Switzerland
| | - Malcolm Kohler
- Sleep Disorders Center and Pulmonary Division, University Hospital of Zurich, Zurich, Switzerland
- Center for Interdisciplinary Sleep Research, University of Zurich, Zurich, Switzerland
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Volatile Organic Compounds in Exhaled Breath of Idiopathic Pulmonary Fibrosis for Discrimination from Healthy Subjects. Lung 2017; 195:247-254. [DOI: 10.1007/s00408-017-9979-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 01/16/2017] [Indexed: 01/27/2023]
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33
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Simulation aided design of a low cost ion mobility spectrometer based on printed circuit boards. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s12127-016-0202-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Online Measurement of Exhaled NO Concentration and Its Production Sites by Fast Non-equilibrium Dilution Ion Mobility Spectrometry. Sci Rep 2016; 6:23095. [PMID: 26975333 PMCID: PMC4791560 DOI: 10.1038/srep23095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 03/01/2016] [Indexed: 01/08/2023] Open
Abstract
Exhaled nitric oxide (NO) is one of the most promising breath markers for respiratory diseases. Its profile for exhalation and the respiratory NO production sites can provide useful information for medical disease diagnosis and therapeutic procedures. However, the high-level moisture in exhaled gas always leads to the poor selectivity and sensitivity for ion spectrometric techniques. Herein, a method based on fast non-equilibrium dilution ion mobility spectrometry (NED-IMS) was firstly proposed to directly monitor the exhaled NO profile on line. The moisture interference was eliminated by turbulently diluting the original moisture to 21% of the original with the drift gas and dilution gas. Weak enhancement was observed for humid NO response and its limit of detection at 100% relative humidity was down to 0.58 ppb. The NO concentrations at multiple exhalation flow rates were measured, while its respiratory production sites were determined by using two-compartment model (2CM) and Högman and Meriläinen algorithm (HMA). Last but not the least, the NO production sites were analyzed hourly to tentatively investigate the daily physiological process of NO. The results demonstrated the capacity of NED-IMS in the real-time analysis of exhaled NO and its production sites for clinical diagnosis and assessment.
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Hüppe T, Lorenz D, Maurer F, Albrecht FW, Schnauber K, Wolf B, Sessler DI, Volk T, Fink T, Kreuer S. Exhalation of volatile organic compounds during hemorrhagic shock and reperfusion in rats: an exploratory trial. J Breath Res 2016; 10:016016. [DOI: 10.1088/1752-7155/10/1/016016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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A novel method for the determination of three volatile organic compounds in exhaled breath by solid-phase microextraction–ion mobility spectrometry. Anal Bioanal Chem 2015; 408:839-47. [DOI: 10.1007/s00216-015-9170-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 10/26/2015] [Accepted: 11/03/2015] [Indexed: 01/29/2023]
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38
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Transient simulation of moving ion clouds in time-of-flight ion mobility spectrometers operating with DC and AC fields. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s12127-015-0179-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Hauschild AC, Frisch T, Baumbach JI, Baumbach J. Carotta: Revealing Hidden Confounder Markers in Metabolic Breath Profiles. Metabolites 2015; 5:344-63. [PMID: 26065494 PMCID: PMC4495376 DOI: 10.3390/metabo5020344] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 05/20/2015] [Accepted: 05/25/2015] [Indexed: 12/20/2022] Open
Abstract
Computational breath analysis is a growing research area aiming at identifying volatile organic compounds (VOCs) in human breath to assist medical diagnostics of the next generation. While inexpensive and non-invasive bioanalytical technologies for metabolite detection in exhaled air and bacterial/fungal vapor exist and the first studies on the power of supervised machine learning methods for profiling of the resulting data were conducted, we lack methods to extract hidden data features emerging from confounding factors. Here, we present Carotta, a new cluster analysis framework dedicated to uncovering such hidden substructures by sophisticated unsupervised statistical learning methods. We study the power of transitivity clustering and hierarchical clustering to identify groups of VOCs with similar expression behavior over most patient breath samples and/or groups of patients with a similar VOC intensity pattern. This enables the discovery of dependencies between metabolites. On the one hand, this allows us to eliminate the effect of potential confounding factors hindering disease classification, such as smoking. On the other hand, we may also identify VOCs associated with disease subtypes or concomitant diseases. Carotta is an open source software with an intuitive graphical user interface promoting data handling, analysis and visualization. The back-end is designed to be modular, allowing for easy extensions with plugins in the future, such as new clustering methods and statistics. It does not require much prior knowledge or technical skills to operate. We demonstrate its power and applicability by means of one artificial dataset. We also apply Carotta exemplarily to a real-world example dataset on chronic obstructive pulmonary disease (COPD). While the artificial data are utilized as a proof of concept, we will demonstrate how Carotta finds candidate markers in our real dataset associated with confounders rather than the primary disease (COPD) and bronchial carcinoma (BC). Carotta is publicly available at http://carotta.compbio.sdu.dk [1].
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Affiliation(s)
- Anne-Christin Hauschild
- Computational Systems Biology Group, Max Planck Institute for Informatics, Saarbrücken 66123, Germany.
- Computational Biology Group, Department of Mathematics and Computer Science, University of Southern Denmark, Odense 5230, Denmark.
| | - Tobias Frisch
- Computational Systems Biology Group, Max Planck Institute for Informatics, Saarbrücken 66123, Germany.
- Department of Mathematics and Computer Science, Freie Universität Berlin, Berlin 14195, Germany.
| | - Jörg Ingo Baumbach
- Faculty of Applied Chemistry, Reutlingen University, Reutlingen 72762, Germany.
| | - Jan Baumbach
- Computational Biology Group, Department of Mathematics and Computer Science, University of Southern Denmark, Odense 5230, Denmark.
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Albrecht FW, Hüppe T, Fink T, Maurer F, Wolf A, Wolf B, Volk T, Baumbach JI, Kreuer S. Influence of the respirator on volatile organic compounds: an animal study in rats over 24 hours. J Breath Res 2015; 9:016007. [DOI: 10.1088/1752-7155/9/1/016007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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LIU Y, GONG Y, WANG C, WANG X, ZHOU Q, WANG D, GUO L, PI X, ZHANG X, LUO S, LI H, LI E. Online breath analysis of propofol during anesthesia: clinical application of membrane inlet-ion mobility spectrometry. Acta Anaesthesiol Scand 2015; 59:319-28. [PMID: 25565144 DOI: 10.1111/aas.12448] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 11/17/2014] [Indexed: 12/20/2022]
Abstract
BACKGROUND Breath analysis of propofol is a potential noninvasive method for approximating the plasma propofol concentration. There have been various reported techniques for measuring the exhaled propofol concentration at steady state; however, the propofol concentration undergoes marked changes during clinical anesthesia. Therefore, this study investigated the use of membrane inlet-ion mobility spectrometry (MI-IMS) to monitor exhaled propofol discontinuously and continuously during propofol anesthesia. METHODS The study included 19 patients of American Society of Anesthesiologists physical status I or II. In experiment I (discontinuous study), breath and blood samples were collected discontinuously, with stable target propofol concentrations of 2.8 μg/ml, 3.2 μg/ml, 3.5 μg/ml, and 3.8 μg/ml. In experiment II (continuous study), propofol concentration was maintained at 3.5 μg/ml after induction, and exhaled breath was collected continuously every 3 min during propofol infusion. Relationships of the exhaled propofol concentration with the plasma propofol concentration, measured by high-performance liquid chromatography and the continuously measured bispectral (BIS) index were investigated. RESULTS Comparison of the exhaled and plasma propofol concentrations revealed a bias ± precision of 2.1% ± 14.6% (95% limits of agreement: - 26.5-30.7%) in experiment I and - 10.4% ± 13.2 (- 36.3-15.4%) in experiment II. In both experiments, exhaled propofol concentrations measured by MI-IMS were consistent with, the propofol effect represented by the BIS index. CONCLUSIONS MI-IMS may be a suitable method to predict plasma propofol concentration online during propofol anesthesia. Monitoring exhaled propofol may improve the safety of propofol anesthesia.
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Affiliation(s)
- Y. LIU
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - Y. GONG
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - C. WANG
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - X. WANG
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian Liaoning China
| | - Q. ZHOU
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian Liaoning China
| | - D. WANG
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - L. GUO
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - X. PI
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - X. ZHANG
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - S. LUO
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
| | - H. LI
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian Liaoning China
| | - E. LI
- Department of Anesthesiology; The First Affiliated Hospital of Harbin Medical University; Harbin Heilongjiang China
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Pereira J, Porto-Figueira P, Cavaco C, Taunk K, Rapole S, Dhakne R, Nagarajaram H, Câmara JS. Breath analysis as a potential and non-invasive frontier in disease diagnosis: an overview. Metabolites 2015; 5:3-55. [PMID: 25584743 PMCID: PMC4381289 DOI: 10.3390/metabo5010003] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 12/12/2014] [Indexed: 02/06/2023] Open
Abstract
Currently, a small number of diseases, particularly cardiovascular (CVDs), oncologic (ODs), neurodegenerative (NDDs), chronic respiratory diseases, as well as diabetes, form a severe burden to most of the countries worldwide. Hence, there is an urgent need for development of efficient diagnostic tools, particularly those enabling reliable detection of diseases, at their early stages, preferably using non-invasive approaches. Breath analysis is a non-invasive approach relying only on the characterisation of volatile composition of the exhaled breath (EB) that in turn reflects the volatile composition of the bloodstream and airways and therefore the status and condition of the whole organism metabolism. Advanced sampling procedures (solid-phase and needle traps microextraction) coupled with modern analytical technologies (proton transfer reaction mass spectrometry, selected ion flow tube mass spectrometry, ion mobility spectrometry, e-noses, etc.) allow the characterisation of EB composition to an unprecedented level. However, a key challenge in EB analysis is the proper statistical analysis and interpretation of the large and heterogeneous datasets obtained from EB research. There is no standard statistical framework/protocol yet available in literature that can be used for EB data analysis towards discovery of biomarkers for use in a typical clinical setup. Nevertheless, EB analysis has immense potential towards development of biomarkers for the early disease diagnosis of diseases.
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Affiliation(s)
- Jorge Pereira
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus Universitário da Penteada, Funchal 9000-390, Portugal.
| | - Priscilla Porto-Figueira
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus Universitário da Penteada, Funchal 9000-390, Portugal.
| | - Carina Cavaco
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus Universitário da Penteada, Funchal 9000-390, Portugal.
| | - Khushman Taunk
- Proteomics Lab, National Centre for Cell Science, Ganeshkhind, Pune 411007, India.
| | - Srikanth Rapole
- Proteomics Lab, National Centre for Cell Science, Ganeshkhind, Pune 411007, India.
| | - Rahul Dhakne
- Laboratory of Computational Biology, Centre for DNA Fingerprinting & Diagnostics, Hyderabad, Andhra Pradesh 500 001, India.
| | - Hampapathalu Nagarajaram
- Laboratory of Computational Biology, Centre for DNA Fingerprinting & Diagnostics, Hyderabad, Andhra Pradesh 500 001, India.
| | - José S Câmara
- CQM-Centro de Química da Madeira, Universidade da Madeira, Campus Universitário da Penteada, Funchal 9000-390, Portugal.
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Exhaled breath analysis for lung cancer detection using ion mobility spectrometry. PLoS One 2014; 9:e114555. [PMID: 25490772 PMCID: PMC4260864 DOI: 10.1371/journal.pone.0114555] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 11/11/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Conventional methods for lung cancer detection including computed tomography (CT) and bronchoscopy are expensive and invasive. Thus, there is still a need for an optimal lung cancer detection technique. METHODS The exhaled breath of 50 patients with lung cancer histologically proven by bronchoscopic biopsy samples (32 adenocarcinomas, 10 squamous cell carcinomas, 8 small cell carcinomas), were analyzed using ion mobility spectrometry (IMS) and compared with 39 healthy volunteers. As a secondary assessment, we compared adenocarcinoma patients with and without epidermal growth factor receptor (EGFR) mutation. RESULTS A decision tree algorithm could separate patients with lung cancer including adenocarcinoma, squamous cell carcinoma and small cell carcinoma. One hundred-fifteen separated volatile organic compound (VOC) peaks were analyzed. Peak-2 noted as n-Dodecane using the IMS database was able to separate values with a sensitivity of 70.0% and a specificity of 89.7%. Incorporating a decision tree algorithm starting with n-Dodecane, a sensitivity of 76% and specificity of 100% was achieved. Comparing VOC peaks between adenocarcinoma and healthy subjects, n-Dodecane was able to separate values with a sensitivity of 81.3% and a specificity of 89.7%. Fourteen patients positive for EGFR mutation displayed a significantly higher n-Dodecane than for the 14 patients negative for EGFR (p<0.01), with a sensitivity of 85.7% and a specificity of 78.6%. CONCLUSION In this prospective study, VOC peak patterns using a decision tree algorithm were useful in the detection of lung cancer. Moreover, n-Dodecane analysis from adenocarcinoma patients might be useful to discriminate the EGFR mutation.
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