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Volatile organic compounds

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https://www.readbyqxmd.com/read/28240875/direct-and-air-mediated-transfer-of-labeled-svocs-from-indoor-sources-to-dust
#1
Vilma Sukiene, Natalie von Goetz, Andreas C Gerecke, Martine I Bakker, Christiaan J E Delmaar, Konrad Hungerbuehler
Two small-scale field studies were conducted to investigate the transfer of substances from products into dust due to direct and air-mediated transfer. The project focused on semi-volatile organic compounds (SVOCs), which are frequently found in and re-emitted from dust. For the field studies, four artificial products containing deuterium-labelled SVOCs (eight phthalates and adipates) were installed in residential indoor environments. Two plastic products were installed vertically to consider substance transfer due to evaporation into air...
February 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28239876/the-potential-of-volatile-organic-compounds-for-the-detection-of-active-disease-in-patients-with-ulcerative-colitis
#2
A Smolinska, A G L Bodelier, J W Dallinga, A A M Masclee, D M Jonkers, F-J van Schooten, M J Pierik
BACKGROUND: To optimise treatment of ulcerative colitis (UC), patients need repeated assessment of mucosal inflammation. Current non-invasive biomarkers and clinical activity indices do not accurately reflect disease activity in all patients and cannot discriminate UC from non-UC colitis. Volatile organic compounds (VOCs) in exhaled air could be predictive of active disease or remission in Crohn's disease. AIM: To investigate whether VOCs are able to differentiate between active UC, UC in remission and non-UC colitis...
February 26, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28238366/modeling-potential-occupational-inhalation-exposures-and-associated-risks-of-toxic-organics-from-chemical-storage-tanks-used-in-hydraulic-fracturing-using-aermod
#3
Huan Chen, Kimberly E Carter
Various toxic chemicals used in hydraulic fracturing fluids may influence the inherent health risks associated with these operations. This study investigated the possible occupational inhalation exposures and potential risks related to the volatile organic compounds (VOCs) from chemical storage tanks and flowback pits used in hydraulic fracturing. Potential risks were evaluated based on radial distances between 5 m and 180 m from the wells for 23 contaminants with known inhalation reference concentration (RfC) or inhalation unit risks (IUR)...
February 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28238364/design-and-performance-of-subgrade-biogeochemical-reactors
#4
Jeff Gamlin, Doug Downey, Brad Shearer, Paul Favara
Subgrade biogeochemical reactors (SBGRs), also commonly referred to as in situ bioreactors, are a unique technology for treatment of contaminant source areas and groundwater plume hot spots. SBGRs have most commonly been configured for enhanced reductive dechlorination (ERD) applications for chlorinated solvent treatment. However, they have also been designed for other contaminant classes using alternative treatment media. The SBGR technology typically consists of removal of contaminated soil via excavation or large-diameter augers, and backfill of the soil void with gravel and treatment amendments tailored to the target contaminant(s)...
February 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28238110/electronic-nose-technology-in-respiratory-diseases
#5
REVIEW
Silvano Dragonieri, Giorgio Pennazza, Pierluigi Carratu, Onofrio Resta
Electronic noses (e-noses) are based on arrays of different sensor types that respond to specific features of an odorant molecule, mostly volatile organic compounds (VOCs). Differently from gas chromatography and mass spectrometry, e-noses can distinguish VOCs spectrum by pattern recognition. E-nose technology has successfully been used in commercial applications, including military, environmental, and food industry. Human-exhaled breath contains a mixture of over 3000 VOCs, which offers the postulate that e-nose technology can have medical applications...
February 25, 2017: Lung
https://www.readbyqxmd.com/read/28236484/characterization-and-source-profiling-of-volatile-organic-compounds-in-indoor-air-of-private-residences-in-selangor-state-malaysia
#6
Nobumitsu Sakai, Shuta Yamamoto, Yasuto Matsui, Md Firoz Khan, Mohd Talib Latif, Mustafa Ali Mohd, Minoru Yoneda
Volatile Organic Compounds (VOCs) in indoor air were investigated at 39 private residences in Selangor State, Malaysia to characterize the indoor air quality and to identify pollution sources. Twenty-two VOCs including isomers (14 aldehydes, 5 aromatic hydrocarbons, acetone, trichloroethylene and tetrachloroethylene) were collected by 2 passive samplers for 24h and quantitated using high performance liquid chromatography and gas chromatography mass spectrometry. Source profiling based on benzene/toluene ratio as well as statistical analysis (cluster analysis, bivariate correlation analysis and principal component analysis) was performed to identify pollution sources of the detected VOCs...
February 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28231688/study-on-removal-difference-in-indoor-particulate-matter-and-volatile-organic-compounds-through-application-of-the-plants
#7
Seung-Han Hong, Jiyeon Hong, Jihyeon Yu, Young-Wook Lim
This study was conducted to evaluate the ability of plants to purify indoor air by observing the effective reduction rate among pollutant types of particulate matter and volatile organic compounds. Particulate matter and four types of volatile organic compounds were measured in a new building that is less than 3 years old and under three different conditions: before applying the plant, after applying the plant, and a room without a plant. The removal rate of each pollutant type due to the plant was also compared and analyzed...
February 22, 2017: Environmental Health and Toxicology
https://www.readbyqxmd.com/read/28228762/chronic-drought-decreases-anabolic-and-catabolic-bvoc-emissions-of-quercus-pubescens-in-a-mediterranean-forest
#8
Amélie Saunier, Elena Ormeño, Henri Wortham, Brice Temime-Roussel, Caroline Lecareux, Christophe Boissard, Catherine Fernandez
Biogenic volatile organic compounds (BVOC) emitted by plants can originate from both anabolism (metabolite production through anabolic processes) and catabolism (metabolite degradation by oxidative reactions). Drought can favor leaf oxidation by increasing the oxidative pressure in plant cells. Thus, under the precipitation decline predicted for the Mediterranean region, it can be expected both strong oxidation of anabolic BVOC within leaves and, as a result, enhanced catabolic BVOC emissions. Using an experimental rain exclusion device in a natural forest, we compared the seasonal course of the emissions of the main anabolic BVOC released by Q...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28227610/unraveling-fabrication-and-calibration-of-wearable-gas-monitor-for-use-under-free-living-conditions
#9
Yue Deng, Cheng Chen, Francis Tsow, Xiaojun Xian, Erica Forzani, Yue Deng, Cheng Chen, Francis Tsow, Xiaojun Xian, Erica Forzani, Yue Deng, Xiaojun Xian, Erica Forzani, Cheng Chen, Francis Tsow
Volatile organic compounds (VOC) are organic chemicals that have high vapor pressure at regular conditions. Some VOC could be dangerous to human health, therefore it is important to determine real-time indoor and outdoor personal exposures to VOC. To achieve this goal, our group has developed a wearable gas monitor with a complete sensor fabrication and calibration protocol for free-living conditions. Correction factors for calibrating the sensors, including sensitivity, aging effect, and temperature effect are implemented into a Quick Response Code (QR code), so that the pre-calibrated quartz tuning fork (QTF) sensor can be used with the wearable monitor under free-living conditions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225105/elucidating-the-biosynthetic-pathways-of-volatile-organic-compounds-in-mycobacterium-tuberculosis-through-a-computational-approach
#10
Purva Bhatter, Karthik Raman, Vani Janakiraman
Microbial volatile organic compounds (VOCs) have gained prominence in the recent past for their potential use as disease markers. The discovery of microbial VOCs has benefited 'difficult to detect' diseases such as tuberculosis (TB). Few of the identified VOCs of Mycobacterium tuberculosis (Mtb) are currently being explored for their diagnostic potential. However, very little is known about the biosynthesis of these small lipophilic molecules. Here, we propose putative biosynthetic pathways in Mycobacterium tuberculosis for three VOCs, namely methyl nicotinate, methyl phenylacetate and methyl p-anisate, using computational approaches...
February 22, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28224910/identification-of-sink-spots-in-two-thermal-desorption-gc-ms-systems-for-the-analysis-of-polycyclic-aromatic-hydrocarbons
#11
Yingjie Li, Jiping Zhu
Thermal desorption (TD) GC/MS has been used for the analysis of polycyclic aromatic hydrocarbons (PAHs) and other semi-volatile organic compounds. However, thermal desorption recovery of PAHs have not been well studied and the cause of PAH residues in a TD system has not been clearly understood. Our results showed that low volatility of PAHs can lead to their incomplete recovery in a TD system: for the PAHs with low vapour pressures, up to 10% and 3% could be lost in a two-stage (TS) TD system and a short-path (SP) TD system, respectively...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28224154/unexpectedly-high-concentrations-of-monoterpenes-in-a-study-of-uk-homes
#12
Chunting Michelle Wang, Benjamin Barratt, Nicola Carslaw, Artemis Doutsi, Rachel E Dunmore, Martyn W Ward, Alastair C Lewis
The abundance of volatile organic compounds (VOCs) found in homes depends on many factors such as emissions, ventilation and the oxidative environment and these are evolving over time, reflecting changes in chemical use, behaviour and building design/materials. The concentrations of VOCs in 25 UK homes of varying ages, design and occupancy were quantified using continuous indoor air sampling over five days. Air was collected through low flow (1 mL min(-1)) constant flow restrictors into evacuated 6 L internally silica-treated canisters until the canisters reached atmospheric pressure...
February 22, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28223976/plant-growth-promotion-by-volatile-organic-compounds-produced-by-bacillus-subtilis-syst2
#13
Hafiz A S Tahir, Qin Gu, Huijun Wu, Waseem Raza, Alwina Hanif, Liming Wu, Massawe V Colman, Xuewen Gao
Bacterial volatiles play a significant role in promoting plant growth by regulating the synthesis or metabolism of phytohormones. In vitro and growth chamber experiments were conducted to investigate the effect of volatile organic compounds (VOCs) produced by the plant growth promoting rhizobacterium Bacillus subtilis strain SYST2 on hormone regulation and growth promotion in tomato plants. We observed a significant increase in plant biomass under both experimental conditions; we observed an increase in photosynthesis and in the endogenous contents of gibberellin, auxin, and cytokinin, while a decrease in ethylene levels was noted...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28221854/effects-of-fish-derived-biological-preservatives-on-cold-storage-of-grass-carp-ctenopharyngodon-idellus-fillets
#14
Tingting Li, Yang Jiang, Gaowei Jin, Qiancheng Zhao, Jianrong Li
Two kinds of fish-derived natural antimicrobial substances, protamine and catfish ( Clarias fuscus ) epidermal mucus extract (CEME), were evaluated for their effect on the quality of grass carp fillets. Fillets were atmosphere packaged in cast polypropylene bags and were stored at 4°C in a low-temperature incubator without light. Solutions (0.5%, wt/vol) of CEME and protamine were used for dip pretreatment, respectively. Bacteriological (aerobic plate count, Shewanella putrefaciens , Pseudomonas fluorescens ) and physicochemical (pH, total volatile basic nitrogen, K value, surface color, texture profiles, water distribution) parameters and volatile odor compounds were measured on days 0, 3, 6, 9, 12, and 15...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28218729/exhaled-breath-metabolomics-for-the-diagnosis-of-pneumonia-in-intubated-and-mechanically-ventilated-intensive-care-unit-icu-patients
#15
Pouline M P van Oort, Sanne de Bruin, Hans Weda, Hugo H Knobel, Marcus J Schultz, Lieuwe D Bos, On Behalf Of The Mars Consortium
The diagnosis of hospital-acquired pneumonia remains challenging. We hypothesized that analysis of volatile organic compounds (VOCs) in exhaled breath could be used to diagnose pneumonia or the presence of pathogens in the respiratory tract in intubated and mechanically-ventilated intensive care unit patients. In this prospective, single-centre, cross-sectional cohort study breath from mechanically ventilated patients was analysed using gas chromatography-mass spectrometry. Potentially relevant VOCs were selected with a p-value < 0...
February 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28218253/environmental-conditions-regulate-the-impact-of-plants-on-cloud-formation
#16
D F Zhao, A Buchholz, R Tillmann, E Kleist, C Wu, F Rubach, A Kiendler-Scharr, Y Rudich, J Wildt, Th F Mentel
The terrestrial vegetation emits large amounts of volatile organic compounds (VOC) into the atmosphere, which on oxidation produce secondary organic aerosol (SOA). By acting as cloud condensation nuclei (CCN), SOA influences cloud formation and climate. In a warming climate, changes in environmental factors can cause stresses to plants, inducing changes of the emitted VOC. These can modify particle size and composition. Here we report how induced emissions eventually affect CCN activity of SOA, a key parameter in cloud formation...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28216165/isolation-and-identification-of-new-chemical-constituents-from-chinese-chive-allium-tuberosum-and-toxicological-evaluation-of-raw-and-cooked-chinese-chive
#17
Quan Gao, Xia-Bing Li, Jia Sun, Er-Dong Xia, Feng Tang, Hai-Qun Cao, Hang Xun
Chinese chive (jiu cai) is a popular vegetable in China and has a unique flavour and aroma. The molecular basis of the characteristic fragrance and nutritional properties of Chinese chive has not been previously identified. Sequential extractions in a series of solvents and high-performance liquid chromatography were used to isolate 40 compounds from Chinese chive. The compounds were identified based on high-resolution electrospray ionization mass spectra, 1D and 2D nuclear magnetic resonance techniques, and circular dichroism spectra...
February 20, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28215812/indoor-air-pollutants-ventilation-rate-determinants-and-potential-control-strategies-in-chinese-dwellings-a-literature-review
#18
Wei Ye, Xu Zhang, Jun Gao, Guangyu Cao, Xiang Zhou, Xing Su
After nearly twenty years of rapid modernization and urbanization in China, huge achievements have transformed the daily lives of the Chinese people. However, unprecedented environmental consequences in both indoor and outdoor environments have accompanied this progress and have triggered public awareness and demands for improved living standards, especially in residential environments. Indoor pollution data measured for >7000 dwellings (approximately 1/3 were newly decorated and were tested for volatile organic compound (VOC) measurements, while the rest were tested for particles, phthalates and other semi-volatile organic compounds (SVOCs), moisture/mold, inorganic gases and radon) in China within the last ten years were reviewed, summarized and compared with indoor concentration recommendations based on sensory or health end-points...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28214624/effect-of-cobalt-loading-on-the-solid-state-properties-and-ethyl-acetate-oxidation-performance-of-cobalt-cerium-mixed-oxides
#19
M Konsolakis, S A C Carabineiro, G E Marnellos, M F Asad, O S G P Soares, M F R Pereira, J J M Órfão, J L Figueiredo
Cobalt-cerium mixed oxides were prepared by the wet impregnation method and evaluated for volatile organic compounds (VOCs) abatement, using ethyl acetate (EtAc) as model molecule. The impact of Co content on the physicochemical characteristics of catalysts and EtAc conversion was investigated. The materials were characterized by various techniques, including N2 adsorption at -196°C, scanning electron microscopy (SEM), X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) to reveal the structure-activity relationship...
February 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213543/functional-characterization-of-a-28-kb-catabolic-island-from-pseudomonas-sp-m1-involved-in-biotransformation-of-%C3%AE-myrcene-and-related-plant-derived-volatiles
#20
Pedro Soares-Castro, Pedro Montenegro-Silva, Hermann J Heipieper, Pedro M Santos
Pseudomonas sp. M1 is able to mineralize highly hydrophobic and recalcitrant compounds such as benzene, phenol and their methylated/halogenated derivatives, as well as the backbone of several monoterpenes. The ability to use such spectrum of compounds as sole carbon source is, most probably, associated with a genetic background evolved under different environmental constraints. The outstanding performance of M1 strain regarding β-myrcene catabolism was elucidated in this work, with focus on the biocatalytical potential of β-myrcene-associated core-code, comprised in a 28-kb genomic island (GI), predicted to be organized in 8 transcriptional units...
February 17, 2017: Applied and Environmental Microbiology
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