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Volatile organic compound analysis

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https://www.readbyqxmd.com/read/29780668/impact-of-front-range-sources-on-reactive-nitrogen-concentrations-and-deposition-in-rocky-mountain-national-park
#1
Katherine B Benedict, Anthony J Prenni, Amy P Sullivan, Ashley R Evanoski-Cole, Emily V Fischer, Sara Callahan, Barkley C Sive, Yong Zhou, Bret A Schichtel, Jeffrey L Collett
Human influenced atmospheric reactive nitrogen (RN) is impacting ecosystems in Rocky Mountain National Park (ROMO). Due to ROMO's protected status as a Class 1 area, these changes are concerning, and improving our understanding of the contributions of different types of RN and their sources is important for reducing impacts in ROMO. In July-August 2014 the most comprehensive measurements (to date) of RN were made in ROMO during the Front Range Air Pollution and Photochemistry Éxperiment (FRAPPÉ). Measurements included peroxyacetyl nitrate (PAN), C1 -C5 alkyl nitrates, and high-time resolution NOx , NOy , and ammonia...
2018: PeerJ
https://www.readbyqxmd.com/read/29779386/gas-analysis-by-electron-ionization-combined-with-chemical-ionization-in-a-compact-ft-icr-mass-spectrometer
#2
Michel Heninger, Hélène Mestdagh, Essyllt Louarn, Gérard Mauclaire, Pierre Boissel, Julien Leprovost, Elsa Bauchard, Sebastien Thomas, Joel Lemaire
In this paper, a compact Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer based on a permanent magnet is presented. This instrument has been developed for real-time analysis of gas emissions. The instrument is well suited to industrial applications or analysis of toxic and complex samples where the concentrations can vary rapidly on a wide range. The novelty of this instrument is the ability to use either electron ionization (EI) or chemical ionization (CI) individually or both of them alternatively...
May 20, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29771243/breath-volatile-organic-compounds-of-lung-transplant-recipients-with-and-without-chronic-lung-allograft-dysfunction
#3
Lucas Küppers, Olaf Holz, Sven Schuchardt, Jens Gottlieb, Jan Fuge, Mark Greer, Jens Hohlfeld
Chronic lung allograft dysfunction (CLAD) with its clinical correlative of bronchiolitis obliterans syndrome (BOS) remains the major limiting factor for long-term graft survival. Currently there are no established methods for the early diagnosis or prediction of BOS. To assess the feasibility of breath collection as a non-invasive tool and the potential of breath volatile organic compounds (VOC) for the early detection of BOS, we compared the breath VOC composition between transplant patients without and different stages of BOS...
May 17, 2018: Journal of Breath Research
https://www.readbyqxmd.com/read/29770906/volatile-and-contact-chemical-cues-associated-with-host-and-mate-recognition-behavior-of-sphenophorus-venatus-and-sphenophorus-parvulus-coleoptera-dryophthoridae
#4
Alexandra G Duffy, Gabriel P Hughes, Matthew D Ginzel, Douglas S Richmond
Beetles in the genus Sphenophorus Schönherr, or billbugs, potentially utilize both volatile and non-volatile behavior-modifying chemical signals. These insects are widely distributed across North America, often occurring in multi-species assemblages in grasses. However, details about their host- and mate-finding behavior are poorly understood. This study tested the hypothesis that volatile organic compounds from host-plants and conspecifics direct the dispersal behavior of hunting billbug S. venatus Say. Further, we characterized the cuticular hydrocarbon profiles of two widespread pest species, S...
May 17, 2018: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/29770884/activated-carbon-fiber-filters-could-reduce-the-risk-of-surgical-smoke-exposure-during-laparoscopic-surgery-application-of-volatile-organic-compounds
#5
Seock Hwan Choi, Dong Hee Choi, Dong Hwa Kang, Yun-Sok Ha, Jun Nyung Lee, Bum Soo Kim, Hyun Tae Kim, Eun Sang Yoo, Tae Gyun Kwon, Sung Kwang Chung, Tae-Hwan Kim
BACKGROUND: Generation of smoke is inevitable during surgical procedures. Some volatile organic compounds (VOCs) in surgical smoke are known to be strong carcinogens. We used a prototype of a multi-layered complex filter in an attempt to eliminate VOCs. METHODS: From June 2015 to July 2015, 20 patients underwent transperitoneal laparoscopic nephrectomy for renal cell carcinoma. Smoke (pre-filter) was collected 20 min after the electrocautery device was first used during the surgery, by the direct collection method, with a 5-L Tedlar® gas-sampling bag...
May 16, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29767961/real-time-monitoring-of-tricarboxylic-acid-metabolites-in-exhaled-breath
#6
Alberto Tejero Rioseras, Kapil Dev Singh, Nora Nowak, Martin T Gaugg, Tobias Bruderer, Renato Zenobi, Pablo M-L Sinues
The tricarboxylic acid (TCA) cycle is one of the most important metabolic pathway for cellular respiration in aerobic organisms. It provides and collects intermediates for many other interconnecting pathways and acts as a hub connecting metabolism of carbohydrates, fatty acids, and amino acids. Alteration in intracellular levels of its intermediates has been linked with a wide range of illnesses ranging from cancer to cellular necrosis or liver cirrhosis. Therefore, there exists an intrinsic interest in monitoring such metabolites...
May 16, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29762468/multivariate-analysis-as-a-tool-to-identify-concentrations-from-strongly-overlapping-gas-spectra
#7
Yannick Saalberg, Marcus Wolff
We applied a multivariate analysis (MVA) to spectroscopic data of gas mixtures in the mid-IR in order to calculate the concentrations of the single components which exhibit strongly overlapping absorption spectra. This is a common challenge in broadband spectroscopy. Photoacoustic (PA) measurements of different volatile organic compounds (VOCs) in the wavelength region of 3250 nm to 3550 nm served as the exemplary detection technique. Partial least squares regression (PLS) was used to calculate concentrations from the PA spectra...
May 15, 2018: Sensors
https://www.readbyqxmd.com/read/29761519/evaluation-of-needle-trap-micro-extraction-and-solid-phase-micro-extraction-obtaining-comprehensive-information-on-volatile-emissions-from-in-vitro-cultures
#8
Peter Oertel, Andreas Bergmann, Sina Fischer, Phillip Trefz, Anne Küntzel, Petra Reinhold, Heike Köhler, Jochen K Schubert, Wolfram Miekisch
Volatile organic compounds (VOCs) emitted from in vitro cultures may reveal information on species and metabolism. Due to low nmol L-1 concentration ranges, pre-concentration techniques are required for gas-chromatography mass-spectrometry (GC-MS) based analyses. This study was intended to compare the efficiency of established micro-extraction techniques - solid-phase micro-extraction (SPME) and needle-trap micro-extraction (NTME) - for the analysis of complex VOC patterns. For SPME, a 75 μm Carboxen®/Polydimethylsiloxane fibre was used...
May 14, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29760879/smell-the-change-on-the-potential-of-gas-chromatographic-ion-mobility-spectrometry-in-ecosystem-monitoring
#9
Wolfgang Vautz, Chandrasekhara Hariharan, Maximilian Weigend
Plant volatile organic compounds (pVOCs) are being recognized as an important factor in plant-environment interactions. Both the type and amount of the emissions appear to be heavily affected by climate change. A range of studies therefore has been directed toward understanding pVOC emissions, mostly under laboratory conditions (branch/leaf enclosure). However, there is a lack of rapid, sensitive, and selective analytical methods, and therefore, only little is known about VOC emissions under natural, outdoor conditions...
May 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29760294/breath-profiles-of-children-on-ketogenic-therapy
#10
Vera Ruzsanyi, Miklós Péter Kalapos, Christine Schmidl, Daniela Karall, Sabine Scholl-Buergi, Matthias Baumann
Ketogenic diets (KD) were initially introduced to clinical practice as alimentary approaches with the aim to control drug-resistant epilepsies. Therapy control, particularly at initiation, happens through regular blood analysis and control of urine ketone levels. However, there is a lack of fast, reliable and preferably non-invasive methods of analysis. The exhaled breath contains hundreds of volatile organic compounds (VOCs), which can be modified by diet. The instrumental development of VOC detection converges in the direction of low cost sensors, which can facilitate the self-monitoring of the patients in the future if reliable breath markers are available...
May 15, 2018: Journal of Breath Research
https://www.readbyqxmd.com/read/29756445/multicapillary-gas-chromatography-temperature-modulated-metal-oxide-semiconductor-sensors-array-detector-for-monitoring-of-volatile-organic-compounds-in-closed-atmosphere-using-gaussian-apodization-factor-analysis
#11
Amir Hossein Alinoori, Saeed Masoum
A unique metal oxide semiconductor sensor (MOS) array detector with eight sensors was designed and fabricated in a PTFE chamber as an interface for coupling with multicapillary gas chromatography. This design consists of eight transfer lines with equal length between the multicapillary columns (MCC) and sensors. The deactivated capillary columns were passed through each transfer line and homemade flow splitter to distribute the same gas flow on each sensor. Using eight ports flow splitter design helps us to equal the length of carrier gas path and flow for each sensor, minimizing the dead volume of the sensor's chamber and increasing chromatographic resolution...
May 14, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29751541/compact-fticr-mass-spectrometry-for-real-time-monitoring-of-volatile-organic-compounds
#12
Joël Lemaire, Sébastien Thomas, Allan Lopes, Essyllt Louarn, Hélène Mestdagh, Hubert Latappy, Julien Leprovost, Michel Heninger
In this paper, we present a compact Fourier transform ion cyclotron resonance mass spectrometer (FTICR-MS) designed for real time analysis of volatile organic compounds (VOCs) in air or in water. The spectrometer is based on a structured permanent magnet made with NdFeB segments. Chemical ionization is implemented inside the ICR cell. The most widely used reaction is the proton transfer reaction using H₃O⁺ precursor ions, but other ionic precursors can be used to extend the range of species that can be detected...
May 3, 2018: Sensors
https://www.readbyqxmd.com/read/29750194/thirdhand-smoke-uptake-to-aerosol-particles-in-the-indoor-environment
#13
Peter F DeCarlo, Anita M Avery, Michael S Waring
Aerosol composition measurements made in an indoor classroom indicate the uptake of thirdhand smoke (THS) species to indoor particles, a novel exposure route for THS to humans indoors. Chemical speciation of the organic aerosol fraction using mass spectrometric data and factor analysis identified a reduced nitrogen component, predominantly found in the indoor environment, contributing 29% of the indoor submicron aerosol mass. We identify this factor as THS compounds partitioning from interior surfaces to gas phase and then aerosol phase...
May 2018: Science Advances
https://www.readbyqxmd.com/read/29750030/validation-of-exhaled-volatile-organic-compounds-analysis-using-electronic-nose-as-index-of-copd-severity
#14
Panaiotis Finamore, Claudio Pedone, Simone Scarlata, Alessandra Di Paolo, Simone Grasso, Marco Santonico, Giorgio Pennazza, Raffaele Antonelli Incalzi
Aim: Six-minute walking test distance (6MWD) and body mass index, obstruction, dyspnea and exercise (BODE) index are measures of functional status in COPD patients, but require space, time and patient's compliance. Exhaled volatile organic compounds (VOCs) analysis via electronic nose is a quick and easy method that has already been used to discriminate COPD phenotypes. The aim of this study is to evaluate whether VOCs analysis can predict functional status and its variation over time in COPD patients...
2018: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29728093/pancreatic-ductal-adenocarcinoma-can-be-detected-by-analysis-of-volatile-organic-compounds-vocs-in-alveolar-air
#15
Andrea Princivalle, Lorenzo Monasta, Giovanni Butturini, Claudio Bassi, Luigi Perbellini
BACKGROUND: In the last decade many studies showed that the exhaled breath of subjects suffering from several pathological conditions has a peculiar volatile organic compound (VOC) profile. The objective of the present work was to analyse the VOCs in alveolar air to build a diagnostic tool able to identify the presence of pancreatic ductal adenocarcinoma in patients with histologically confirmed disease. METHODS: The concentration of 92 compounds was measured in the end-tidal breath of 65 cases and 102 controls...
May 4, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29727932/can-chemical-and-molecular-biomarkers-help-discriminate-between-industrial-rural-and-urban-environments
#16
Sonia Garcia-Alcega, Zaheer Ahmad Nasir, Robert Ferguson, Cyril Noël, Cristiana Cravo-Laureau, Corinne Whitby, Alex J Dumbrell, Ian Colbeck, Sean Tyrrel, Frederic Coulon
Air samples from four contrasting outdoor environments including a park, an arable farm, a waste water treatment plant and a composting facility were analysed during the summer and winter months. The aim of the research was to study the feasibility of differentiating microbial communities from urban, rural and industrial areas between seasons with chemical and molecular markers such as microbial volatile organic compounds (MVOCs) and phospholipid fatty acids (PLFAs). Air samples (3l) were collected every 2h for a total of 6h in order to assess the temporal variations of MVOCs and PLFAs along the day...
August 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29725734/analysis-of-isocyanates-in-indoor-dust
#17
Kanae Bekki, Shigehisa Uchiyama, Naoki Kunugita
Isocyanates are harmful semi-volatile organic compounds that are emitted from various consumer products like polyurethane foam-based mattresses. Although it is a concern that isocyanates might accumulate in indoor dust, causing infants and toddlers, in particular, to be exposed to them, little information is available on the levels of isocyanates in the indoor environment. In this study, we investigated the suitability of an analytical method for determining the presence and level of isocyanates in the indoor dust...
May 4, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29725275/td-gc-ms-analysis-of-volatile-markers-emitted-from-mono-and-co-cultures-of-enterobacter-cloacae-and-pseudomonas-aeruginosa-in-artificial-sputum
#18
Oluwasola Lawal, Hugo Knobel, Hans Weda, Tamara M E Nijsen, Royston Goodacre, Stephen J Fowler
Introduction: Infections such as ventilator-associated pneumonia (VAP) can be caused by one or more pathogens. Current methods for identifying these pathogenic microbes often require invasive sampling, and can be time consuming, due to the requirement for prolonged cultural enrichment along with selective and differential plating steps. This results in delays in diagnosis which in such critically ill patients can have potentially life-threatening consequences. Therefore, a non-invasive and timely diagnostic method is required...
2018: Metabolomics: Official Journal of the Metabolomic Society
https://www.readbyqxmd.com/read/29725240/mutagenic-atmospheres-resulting-from-the-photooxidation-of-aromatic-hydrocarbon-and-no-x-mixtures
#19
Theran P Riedel, David M DeMarini, Jose Zavala, Sarah H Warren, Eric W Corse, John H Offenberg, Tadeusz E Kleindienst, Michael Lewandowski
Although many volatile organic compounds (VOCs) are regulated to limit air pollution and the consequent health effects, the photooxidation products generally are not. Thus, we examined the mutagenicity in Salmonella TA100 of photochemical atmospheres generated in a steady-state atmospheric simulation chamber by irradiating mixtures of single aromatic VOCs, NOx , and ammonium sulfate seed aerosol in air. The 10 VOCs examined were benzene; toluene; ethylbenzene; o -, m -, and p -xylene; 1,2,4- and 1,3,5-trimethylbenzene; m -cresol; and naphthalene...
April 2018: Atmospheric Environment
https://www.readbyqxmd.com/read/29724960/cluster-analysis-on-breath-print-of-newly-diagnosed-copd-patients-effects-of-therapy
#20
Simone Scarlata, Panaiotis Finamore, Simona Santangelo, Gilda Giannunzio, Giorgio Pennazza, Simone Grasso, Marco Santonico, Raffaele Antonelli Incalzi
Chronic obstructive pulmonary disease (COPD) is a highly heterogeneous disease and airflow limitation and symptoms only partially capture such heterogeneity. Since COPD is known to affect the production of volatile organic compounds (VOCs), we aimed at verifying to which extent exhaled VOCs can characterize newly diagnosed COPD patients and changes in response to inhaled therapy.
 Materials and methods: Fifty newly diagnosed COPD patients were consecutively recruited among those attending the pulmonary medicine outpatient clinic at "Campus Bio-Medico" University Hospital...
May 4, 2018: Journal of Breath Research
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