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Volatile organic compound analysis

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https://www.readbyqxmd.com/read/28091587/bacillus-volatiles-adversely-affect-the-physiology-and-ultra-structure-of-ralstonia-solanacearum-and-induce-systemic-resistance-in-tobacco-against-bacterial-wilt
#1
Hafiz Abdul Samad Tahir, Qin Gu, Huijun Wu, Yuedi Niu, Rong Huo, Xuewen Gao
Volatile organic compounds (VOCs) produced by various bacteria have significant potential to enhance plant growth and to control phytopathogens. Six of the most effective antagonistic Bacillus spp. were used in this study against Ralstonia solanacearum (Rsc) TBBS1, the causal agent of bacterial wilt disease in tobacco. Bacillus amyloliquefaciens FZB42 and Bacillus artrophaeus LSSC22 had the strongest inhibitory effect against Rsc. Thirteen VOCs produced by FZB42 and 10 by LSSC22 were identified using gas chromatography-mass spectrometry analysis...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28089301/time-since-discharge-of-9mm-cartridges-by-headspace-analysis-part-2-ageing-study-and-estimation-of-the-time-since-discharge-using-multivariate-regression
#2
M Gallidabino, F S Romolo, C Weyermann
Estimating the time since discharge of spent cartridges can be a valuable tool in the forensic investigation of firearm-related crimes. To reach this aim, it was previously proposed that the decrease of volatile organic compounds released during discharge is monitored over time using non-destructive headspace extraction techniques. While promising results were obtained for large-calibre cartridges (e.g., shotgun shells), handgun calibres yielded unsatisfying results. In addition to the natural complexity of the specimen itself, these can also be attributed to some selective choices in the methods development...
December 27, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28089297/time-since-discharge-of-9mm-cartridges-by-headspace-analysis-part-1-comprehensive-optimisation-and-validation-of-a-headspace-sorptive-extraction-hsse-method
#3
M Gallidabino, F S Romolo, C Weyermann
Estimating the time since discharge of spent cartridges can be a valuable tool in the forensic investigation of firearm-related crimes. To reach this aim, it was previously proposed that the decrease of volatile organic compounds released during discharge is monitored over time using non-destructive headspace extraction techniques. While promising results were obtained for large-calibre cartridges (e.g., shotgun shells), handgun calibres yielded unsatisfying results. In addition to the natural complexity of the specimen itself, these can also be attributed to some selective choices in the methods development...
December 24, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28078400/characterization-of-four-endophytic-fungi-as-potential-consolidated-bioprocessing-hosts-for-conversion-of-lignocellulose-into-advanced-biofuels
#4
Weihua Wu, Ryan W Davis, Mary Bao Tran-Gyamfi, Alan Kuo, Kurt LaButti, Sirma Mihaltcheva, Hope Hundley, Mansi Chovatia, Erika Lindquist, Kerrie Barry, Igor V Grigoriev, Bernard Henrissat, John M Gladden
Recently, several endophytic fungi have been demonstrated to produce volatile organic compounds (VOCs) with properties similar to fossil fuels, called "mycodiesel," while growing on lignocellulosic plant and agricultural residues. The fact that endophytes are plant symbionts suggests that some may be able to produce lignocellulolytic enzymes, making them capable of both deconstructing lignocellulose and converting it into mycodiesel, two properties that indicate that these strains may be useful consolidated bioprocessing (CBP) hosts for the biofuel production...
January 12, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28063579/classification-of-nine-malathion-emulsion-samples-by-using-carbon-isotope-ratios-and-the-ratio-of-organic-solvents
#5
Nana Suto, Hiroto Kawashima
The compound specific isotope analysis is nowadays an important and powerful tool in geochemical, environmental and forensics field. On November 2013, Aqli Foods Corporation in Japan dealt with complaints about stench from frozen foods produced. Subsequently, very high concentrations of organophosphorus pesticide as malathion, ethylbenzene and xylene were detected in recovered frozen foods. In particular case, we present the method to measure the stable carbon isotope ratio (δ(13)C) of nine malathion emulsion pesticides using gas chromatography/isotope ratio mass spectrometry (GC/IRMS) to identify the source...
January 2017: Science & Justice: Journal of the Forensic Science Society
https://www.readbyqxmd.com/read/28049457/breathdx-molecular-analysis-of-exhaled-breath-as-a-diagnostic-test-for-ventilator-associated-pneumonia-protocol-for-a-european-multicentre-observational-study
#6
Pouline M P van Oort, Tamara Nijsen, Hans Weda, Hugo Knobel, Paul Dark, Timothy Felton, Nicholas J W Rattray, Oluwasola Lawal, Waqar Ahmed, Craig Portsmouth, Peter J Sterk, Marcus J Schultz, Tetyana Zakharkina, Antonio Artigas, Pedro Povoa, Ignacio Martin-Loeches, Stephen J Fowler, Lieuwe D J Bos
BACKGROUND: The diagnosis of ventilator-associated pneumonia (VAP) remains time-consuming and costly, the clinical tools lack specificity and a bedside test to exclude infection in suspected patients is unavailable. Breath contains hundreds to thousands of volatile organic compounds (VOCs) that result from host and microbial metabolism as well as the environment. The present study aims to use breath VOC analysis to develop a model that can discriminate between patients who have positive cultures and who have negative cultures with a high sensitivity...
January 3, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28045447/investigation-of-indoor-air-quality-in-houses-of-macedonia
#7
Silvia Vilčeková, Ilija Zoran Apostoloski, Ľudmila Mečiarová, Eva Krídlová Burdová, Jozef Kiseľák
People who live in buildings are exposed to harmful effects of indoor air pollution for many years. Therefore, our research is aimed to investigate the indoor air quality in family houses. The measurements of indoor air temperature, relative humidity, total volatile organic compounds (TVOC), particulate matters (PM) and sound pressure level were carried out in 25 houses in several cities of the Republic of Macedonia. Mean values of indoor air temperature and relative humidity ranged from 18.9 °C to 25.6 °C and from 34...
January 1, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28043256/-determination-of-volatile-organic-compounds-in-air-by-portable-gas-chromatography-mass-spectroscopy
#8
W F Rong, J H He, R B Meng, W J Ling, J W Hu, J J Qiu, M Dong
Objective: To investigate the method of portable gas chromatography-mass spectroscopy (GC-MS) for the determination of common volatile organic compounds in air. Methods: The static volumetric method was used, with highly purified nitrogen gas as the diluents gas, to prepare the mixed standard gas of common volatile organic compounds with various mass concentrations. A portable GC-MS handheld probe was used for sampling and measurement, retention time and characteristic ion were used for qualitative analysis, and the full-scan mode was used for quantitative analysis...
October 20, 2016: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28043076/bio-sniffer-gas-phase-biosensor-with-secondary-alcohol-dehydrogenase-s-adh-for-determination-of-isopropanol-in-exhaled-air-as-a-potential-volatile-biomarker
#9
Po-Jen Chien, Takuma Suzuki, Masato Tsujii, Ming Ye, Koji Toma, Takahiro Arakawa, Yasuhiko Iwasaki, Kohji Mitsubayashi
Exhaled breath analysis has attracted lots of researchers attention in the past decades due to its advantages such as its non-invasive property and the possibility of continuous monitoring. In addition, several volatile organic compounds in breath have been identified as biomarkers for some diseases. Particularly, studies have pointed out that concentration of isopropanol (IPA) in exhaled air might relate with certain illnesses such as liver disease, chronic obstructive pulmonary (COPD), and lung cancer. In this study, a highly sensitive and selective biochemical gas sensor (bio-sniffer) for the breath IPA concentration determination was constructed and optimized...
December 22, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28042686/fe3-o4-polyethylene-glycol-nanocomposite-as-a-solid-phase-microextraction-fiber-coating-for-the-determination-of-some-volatile-organic-compounds-in-water
#10
Manoochehr Farjaminezhad, Mohammad Saber Tehrani, Parviz Aberoomand Azar, Shahab Bohlooli, Syed Waqif Hussain
A high-performance metal oxide-polymer magnetite/polyethylene glycol nanocomposite was prepared and coated in situ on the surface of the optical fiber by sol-gel technology. The magnetite nanoparticles as nanofillers were synthesized by co-precipitation method and bonded with polyethylene glycol as polymer. The chemically bonded coating was evaluated for the headspace-solid phase microextraction of some environmentally important volatile organic compounds, from aqueous samples in combination with gas chromatography and mass spectrometry...
January 2, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28040800/identification-introgression-and-validation-of-fruit-volatile-qtls-from-a-red-fruited-wild-tomato-species
#11
José L Rambla, Aurora Medina, Asun Fernández-Del-Carmen, Walter Barrantes, Silvana Grandillo, Maria Cammareri, Gloria López-Casado, Guillermo Rodrigo, Arancha Alonso, Santiago García-Martínez, Jaime Primo, Juan J Ruiz, Rafael Fernández-Muñoz, Antonio J Monforte, Antonio Granell
Volatile organic compounds (VOCs) are major determinants of fruit flavor, a primary objective in tomato breeding. A recombinant inbred line (RIL) population consisting of 169 lines derived from a cross between Solanum lycopersicum and a red-fruited wild tomato species Solanum pimpinellifolium accession (SP) was characterized for VOCs in three different seasons. Correlation and hierarchical cluster analyses were performed on the 52 VOCs identified, providing a tool for the putative assignation of individual compounds to metabolic pathways...
December 30, 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28040184/effect-of-osmotic-dehydration-of-olives-as-pre-fermentation-treatment-and-partial-substitution-of-sodium-chloride-by-monosodium-glutamate-in-the-fermentation-profile-of-kalamata-natural-black-olives
#12
Stamatoula Bonatsou, Vasilis Iliopoulos, Athanasios Mallouchos, Eleni Gogou, Vasiliki Oikonomopoulou, Magdalini Krokida, Petros Taoukis, Efstathios Z Panagou
This study examined the effect of osmotic dehydration of Kalamata natural black olives as pre-fermentation treatment in combination with partial substitution of NaCl by monosodium glutamate (MSG) on the fermentation profile of olives. Osmotic dehydration was undertaken by immersing the olives in 70% (w/w) glucose syrup overnight at room temperature. Further on, three different mixtures of NaCl and MSG with/without prior osmotic dehydration of olives were investigated, namely (i) 6.65% NaCl - 0.35% MSG (5% substitution), (ii) 6...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28039810/zeolite-loaded-poly-dimethylsiloxane-hybrid-films-for-highly-efficient-thin-film-microextraction-of-organic-volatiles-in-water
#13
Tao Wang, Toshihiro Ansai, Seung-Woo Lee
ZSM-5 zeolite-loaded poly(dimethylsiloxane) (PDMS) hybrid thin films were demonstrated for efficient thin-film microextraction (TFME) coupled with gas chromatography-mass spectrometry for analyzing organic volatiles in water. The extraction efficiency for a series of aliphatic alcohols and two aromatic compounds was significantly improved owing to the presence of ZSM-5 zeolites. The extraction efficiency of the hybrid films was increased in proportion to the content of ZSM-5 in the PDMS film, with 20wt% of ZSM-5 showing the best results...
January 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28038926/the-ecological-role-of-volatile-and-soluble-secondary-metabolites-produced-by-soil-bacteria
#14
REVIEW
Olaf Tyc, Chunxu Song, Jeroen S Dickschat, Michiel Vos, Paolina Garbeva
The rich diversity of secondary metabolites produced by soil bacteria has been appreciated for over a century, and advances in chemical analysis and genome sequencing continue to greatly advance our understanding of this biochemical complexity. However, we are just at the beginning of understanding the physicochemical properties of bacterial metabolites, the factors that govern their production and ecological roles. Interspecific interactions and competitor sensing are among the main biotic factors affecting the production of bacterial secondary metabolites...
December 27, 2016: Trends in Microbiology
https://www.readbyqxmd.com/read/28028595/comprehensive-two-dimensional-gas-chromatographic-profiling-and-chemometric-interpretation-of-the-volatile-profiles-of-sweat-in-knit-fabrics
#15
A Paulina de la Mata, Rachel H McQueen, Seo Lin Nam, James J Harynuk
Human axillary sweat is a poorly explored biofluid within the context of metabolomics when compared to other fluids such as blood and urine. In this paper, we explore the volatile organic compounds emitted from two different types of fabric samples (cotton and polyester) which had been worn repeatedly during exercise by participants. Headspace solid-phase microextraction (SPME) and comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC×GC-TOFMS) were employed to profile the (semi)volatile compounds on the fabric...
December 27, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28013218/genetic-targets-of-acute-toluene-inhalation-in-drosophila-melanogaster
#16
Philip J Bushnell, William Ward, Tatiana V Morozova, Wendy M Oshiro, Mimi T Lin, Richard S Judson, Susan D Hester, John M McKee, Mark Higuchi
Interpretation and use of data from high-throughput assays for chemical toxicity require links between effects at molecular targets and adverse outcomes in whole animals. The well-characterized genome of Drosophila melanogaster provides a potential model system by which phenotypic responses to chemicals can be mapped to genes associated with those responses, which may in turn suggest adverse outcome pathways associated with those genes. To determine the utility of this approach, we used the Drosophila Genetics Reference Panel (DGRP), a collection of ~200 homozygous lines of fruit flies whose genomes have been sequenced...
December 24, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28010745/optical-nose-based-on-porous-silicon-photonic-crystal-infiltrated-with-ionic-liquids
#17
Haijuan Zhang, Leimiao Lin, Dong Liu, Qiaofen Chen, Jianmin Wu
A photonic-nose for the detection and discrimination of volatile organic compounds (VOCs) was constructed. Each sensing element on the photonic sensor array was formed by infiltrating a specific type of ionic liquid (IL) into the pore channel of a patterned porous silicon (PSi) chip. Upon exposure to VOC, the density of IL dramatically decreased due to the nano-confinement effect. As a result, the IL located in pore channel expanded its volume and protrude out of the pore channel, leading to the formation of microdroplets on the PSi surface...
February 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28004102/toluene-methanol-and-benzaldehyde-removal-from-gas-streams-by-adsorption-onto-natural-clay-and-faujasite-y-type-zeolite
#18
Hicham Zaitan, Elham F Mohamed, Héctor Valdés, Mostafa Nawdali, Salah Rafqah, Marie Hélène Manero
A great number of pollution problems come as a result of the emission of Volatile Organic Compounds (VOCs) into the environment and their control becomes a serious challenge for the global chemical industry. Adsorption is a widely used technique for the removal of VOCs due to its high efficiency, low cost, and convenient operation. In this study, the feasibility to use a locally available clay, as adsorbent material to control VOCs emissions is evaluated. Natural clay is characterised by different physical-chemical methods and adsorptive interaction features between VOCs and natural clay are identified...
December 2016: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28002503/atmospheric-oxidation-of-halogenated-aromatics-comparative-analysis-of-reaction-mechanisms-and-reaction-kinetics
#19
Goran Kovacevic, Aleksandar Sabljic
Atmospheric transport is the major route for global distribution of semi-volatile compounds such as halogenated aromatics as well as their major exposure route for humans. Their major atmospheric removal process is oxidation by hydroxyl radicals. There is very little information on the reaction mechanism or reaction-path dynamics of atmospheric degradation of halogenated benzenes. Furthermore, the measured reaction rate constants are missing for the range of environmentally relevant temperatures, i.e. 230-330 K...
December 21, 2016: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28000444/diagnosis-and-classification-of-17-diseases-from-1404-subjects-via-pattern-analysis-of-exhaled-molecules
#20
Morad K Nakhleh, Haitham Amal, Raneen Jeries, Yoav Y Broza, Manal Aboud, Alaa Gharra, Hodaya Ivgi, Salam Khatib, Shifaa Badarneh, Lior Har-Shai, Lea Glass-Marmor, Izabella Lejbkowicz, Ariel Miller, Samih Badarny, Raz Winer, John Finberg, Sylvia Cohen-Kaminsky, Frédéric Perros, David Montani, Barbara Girerd, Gilles Garcia, Gérald Simonneau, Farid Nakhoul, Shira Baram, Raed Salim, Marwan Hakim, Maayan Gruber, Ohad Ronen, Tal Marshak, Ilana Doweck, Ofer Nativ, Zaher Bahouth, Da-You Shi, Wei Zhang, Qing-Ling Hua, Yue-Yin Pan, Li Tao, Hu Liu, Amir Karban, Eduard Koifman, Tova Rainis, Roberts Skapars, Armands Sivins, Guntis Ancans, Inta Liepniece-Karele, Ilze Kikuste, Ieva Lasina, Ivars Tolmanis, Douglas Johnson, Stuart Z Millstone, Jennifer Fulton, John W Wells, Larry H Wilf, Marc Humbert, Marcis Leja, Nir Peled, Hossam Haick
We report on an artificially intelligent nanoarray based on molecularly modified gold nanoparticles and a random network of single-walled carbon nanotubes for noninvasive diagnosis and classification of a number of diseases from exhaled breath. The performance of this artificially intelligent nanoarray was clinically assessed on breath samples collected from 1404 subjects having one of 17 different disease conditions included in the study or having no evidence of any disease (healthy controls). Blind experiments showed that 86% accuracy could be achieved with the artificially intelligent nanoarray, allowing both detection and discrimination between the different disease conditions examined...
December 21, 2016: ACS Nano
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