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Volatile organic compounds

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https://www.readbyqxmd.com/read/29141132/intra-species-volatile-interactions-affects-growth-rates-and-exometabolomes-in-aspergillus-oryzae-kccm-60345
#1
Digar Singh, Choong Hwan Lee
The volatile organic compounds (VOCs) are increasingly been recognized as the chemical mediators of mold interactions shaping their community dynamic, growth, and metabolism. Herein, we selectively examined the time-correlated (0 D - 11 D) effects of intra-species VOCs mediated interactions (VMI) on Aspergillus oryzae KCCM 60345 (S1), following co-cultivation with partner strain A. oryzae KACC 44967 (S2), in specially designed twin plate assembly. The comparative evaluation of S1VMI (S1 subjected to VMI with S2) and its control (S1con) showed a notable disparity in their radial growth (S1VMI<S1con) at 5 D, protease activity (S1VMI>S1con) at 3-5 D, amylase activity (S1VMI<S1con) at 3-5 D, and antioxidant levels (S1VMI>S1con) at 3 D...
November 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29138416/plant-to-plant-communication-triggered-by-systemin-primes-anti-herbivore-resistance-in-tomato
#2
Mariangela Coppola, Pasquale Cascone, Valentina Madonna, Ilaria Di Lelio, Francesco Esposito, Concetta Avitabile, Alessandra Romanelli, Emilio Guerrieri, Alessia Vitiello, Francesco Pennacchio, Rosa Rao, Giandomenico Corrado
Plants actively respond to herbivory by inducing various defense mechanisms in both damaged (locally) and non-damaged tissues (systemically). In addition, it is currently widely accepted that plant-to-plant communication allows specific neighbors to be warned of likely incoming stress (defense priming). Systemin is a plant peptide hormone promoting the systemic response to herbivory in tomato. This 18-aa peptide is also able to induce the release of bioactive Volatile Organic Compounds, thus also promoting the interaction between the tomato and the third trophic level (e...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137783/probing-the-radical-chemistry-and-the-reaction-zone-during-the-sono-degradation-of-endocrine-disruptor-2-phenoxyethanol-in-water
#3
Zineb Boutamine, Oualid Hamdaoui, Slimane Merouani
Sonochemical degradation at 600 kHz of 2-phenoxyethanol (PhE), an endocrine disrupting compound, was performed in the presence of several organic additives, namely: 2-propanol, Triton X-100 and sucrose, of different volatilities to obtain detailed information on the reaction zone and the oxidation pathway of this priority emerging water contaminate. It was found that sonication at 600 kHz and 120 W completely remove PhE (10 mg L(-1)) from aerated solutions within 100 min of irradiation. Very little removal of PhE (∼7%) and low accumulation of H2O2 took place in the presence of adequate amount of 2-propanol, indicating that reaction with OH radical outside the bubble is the major degradation pathway of PhE...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137702/review-of-recent-developments-in-determining-volatile-organic-compounds-in-exhaled-breath-as-biomarkers-for-lung-cancer-diagnosis
#4
REVIEW
Jiemin Zhou, Zi-Ao Huang, Ujendra Kumar, David D Y Chen
Lung cancer is the most common cause of cancer deaths, its global incidence is rising, and continuing rises are predicted. The potential to diagnose lung cancers based on the determination of volatile organic compounds (VOCs) in human breath has been attracting increasing attention with the development of new techniques and methodologies. However, despite many reports of VOC profiling in lung cancer patients, little is known about how specific biomarkers relate to the biochemical pathways involved in lung cancer development, and there is still no reliable method for diagnosing lung cancer at the early stages...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29136906/comparison-of-common-components-analysis-with-principal-components-analysis-and-independent-components-analysis-application-to-spme-gc-ms-volatolomic-signatures
#5
Jihéne Bouhlel, Delphine Jouan-Rimbaud Bouveresse, Said Abouelkaram, Elisabeth Baéza, Catherine Jondreville, Angélique Travel, Jérémy Ratel, Erwan Engel, Douglas N Rutledge
The aim of this work is to compare a novel exploratory chemometrics method, Common Components Analysis (CCA), with Principal Components Analysis (PCA) and Independent Components Analysis (ICA). CCA consists in adapting the multi-block statistical method known as Common Components and Specific Weights Analysis (CCSWA or ComDim) by applying it to a single data matrix, with one variable per block. As an application, the three methods were applied to SPME-GC-MS volatolomic signatures of livers in an attempt to reveal volatile organic compounds (VOCs) markers of chicken exposure to different types of micropollutants...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29135919/acoustic-sensors-based-on-amino-functionalized-nanoparticles-to-detect-volatile-organic-solvents
#6
Daniel Matatagui, Oleg Kolokoltsev, José Manuel Saniger, Isabel Gràcia, María Jesús Fernández, Jose Luis Fontecha, María Del Carmen Horrillo
Love-wave gas sensors based on surface functionalized iron oxide nanoparticles has been developed in this research. Amino-terminated iron oxide nanoparticles were deposited, by a spin coating technique, onto the surface of Love-wave sensors, as a very reproducible gas-sensing layer. The gases tested were organic solvents, such as butanol, isopropanol, toluene and xylene, for a wide and low concentration range, obtaining great responses, fast response times of a few minutes (the time at which the device produced a signal change equal to 90%), good reproducibilities, and different responses for each detected solvent...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29134407/epiphytic-bacteria-alter-floral-scent-emissions
#7
Carola Helletsgruber, Stefan Dötterl, Ulrike Ruprecht, Robert R Junker
Floral scents are key mediators of biotic interactions between flowers and various organisms such as pollinators, antagonistic animals and bacteria. It has been shown that emissions of floral volatiles are influenced by interactions with other organisms at the levels of roots, leaves and flowers. However, it is largely unknown whether and how epiphytic bacteria associated with flowers affect the composition of floral scent. By comparing volatiles of sterile and inoculated plants we found that bacteria may add components, induce or reduce the emission of compounds, and potentially catabolize others...
November 14, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/29132208/organic-chemical-characterization-and-mass-balance-of-a-hydraulically-fractured-well-from-fracturing-fluid-to-produced-water-over-405-days
#8
James S Rosenblum, E Michael Thurman, Imma Ferrer, George R Aiken, Karl G Linden
A long-term field study (405 days) of a hydraulically fractured well from the Niobrara Formation in the Denver-Julesburg Basin was completed. Characterization of organic chemicals used in hydraulic fracturing and their changes through time, from the pre-injected fracturing fluid to the produced water, was conducted. The characterization consisted of a mass balance by dissolved organic carbon (DOC), volatile organic analysis by gas chromatography/mass spectrometry, and nonvolatile organic analysis by liquid chromatography/mass spectrometry...
November 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29131978/simultaneous-photodegradation-of-voc-mixture-by-tio2-powders
#9
Marta Stucchi, Federico Galli, Claudia L Bianchi, Carlo Pirola, Daria C Boffito, Franco Biasioli, Valentino Capucci
Volatile and semi volatile organic compounds' concentration have dramatically increased in indoor environments in recent years. UV light promotes titanium dioxide, which oxidises various molecules; however, most of the studies report the degradation of a single VOC. Here, we investigate the photo-oxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nanometric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transfer-reaction mass spectrometer measured online the concentration of all the pollutants simultaneously...
November 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29131420/chromatographic-analysis-of-voc-patterns-in-exhaled-breath-from-smokers-and-nonsmokers
#10
Simonetta Capone, Maria Tufariello, Angiola Forleo, Valentina Longo, Lucia Giampietruzzi, Antonio Vincenzo Radogna, Flavio Casino, Pietro Siciliano
Cigarette smoking harms nearly every organ of the body and causes many diseases. The analysis of exhaled breath for exogenous and endogenous Volatile Organic Compounds (VOCs) can provide fundamental information on active smoking and insight into the health damage that smoke is creating. Various exhaled Volatile Organic Compounds (VOCs) have been reported as typical of smoking habit and recent tobacco consumption, but to date, no eligible biomarkers have been identified. Aiming to identify such potential biomarkers, in this pilot study we analysed the chemical patterns of exhaled breath from 26 volunteers divided in groups of nonsmokers and subgroups of smokers sampled at different periods of withdrawal from smoking...
November 13, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29129714/non-invasive-diagnosis-of-pancreatic-cancer-through-detection-of-volatile-organic-compounds-in-urine
#11
Ramesh Arasaradnam, Alfian Wicaksono, Harrison O'Brien, Hemant M Kocher, James A Covington, Tatjana Crnogorac-Jurcevic
No abstract text is available yet for this article.
November 9, 2017: Gastroenterology
https://www.readbyqxmd.com/read/29128825/toluene-and-acetaldehyde-removal-from-air-on-to-graphene-based-adsorbents-with-microsized-pores
#12
Ji Min Kim, Ji Hoon Kim, Chang Yeon Lee, Dong Wook Jerng, Ho Seon Ahn
Volatile organic compound (VOC) gases can cause harm to the human body with exposure over the long term even at very low concentrations (ppmv levels); thus, effective absorbents for VOC gas removal are an important issue. In this study, accordingly, graphene-based adsorbents with microsized pores were used as adsorbents to remove toluene and acetaldehyde gases at low concentrations (30ppm). Sufficient amounts of the adsorbents were prepared for use on filters and were loaded uniformly at 0.1-0.5g on a 50×50mm(2) area, to evaluate their adsorption features with low gas concentrations...
October 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29126936/smoking-influences-fecal-volatile-organic-compounds-composition
#13
J de Swart, N van Gaal, D J C Berkhout, T G J de Meij, N K de Boer
No abstract text is available yet for this article.
November 7, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29125194/amyotrophic-lateral-sclerosis-a-case-report-and-mechanistic-review-of-the-association-with-toluene-and-other-volatile-organic-compounds
#14
Marcia H Ratner, Joe F Jabre, William M Ewing, Mohamed Abou-Donia, L Christine Oliver
Unmasking of latent neurodegenerative disease has been reported following exposure to chemicals that share one or more mechanisms of action in common with those implicated in the specific disease. For example, unmasking of latent Parkinson's disease (PD) has been associated with exposure to anti-dopaminergic agents, while the progression of pre-existing mild cognitive impairment and unmasking of latent Alzheimer's disease has been associated with exposure to general anesthetic agents which promote Aβ protein aggregation...
November 10, 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/29122312/gestational-exposure-to-volatile-organic-compounds-vocs-in-northeastern-british-columbia-canada-a-pilot-study
#15
Élyse Caron-Beaudoin, Naomi Valter, Jonathan Chevrier, Pierre Ayotte, Katherine Frohlich, Marc-André Verner
BACKGROUND: Northeastern British Columbia (Canada) is an area of intense hydraulic fracturing for unconventional natural gas exploitation. There have been multiple reports of air and water contamination by volatile organic compounds in the vicinity of gas wells. Although these chemicals are known developmental toxicants, no biomonitoring effort has been carried out in the region. OBJECTIVE: To evaluate gestational exposure to benzene and toluene in the Peace River Valley, Northeastern British Columbia (Canada)...
January 2018: Environment International
https://www.readbyqxmd.com/read/29121599/polyaniline-pani-an-innovative-support-for-sampling-and-removal-of-vocs-in-air-matrices
#16
Cristina Della Pina, Maria Antonietta De Gregorio, Laura Clerici, Pierluisa Dellavedova, Ermelinda Falletta
Polyaniline (PANI)-based materials for both removal and sampling of volatile organic compounds (VOCs) from air by rapid adsorption/desorption processes have been developed. The polymer was synthesized in form of emeraldine as both salt and base using different synthetic approaches, a traditional one and a "green" one. VOCs adsorption/desorption efficiency was evaluated for all the materials analyzing the desorbed VOCs fractions by GC/MS technique and obtaining results similar to the presently adopted method employing commercial activated carbon...
October 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29121563/benthic-invertebrate-exposure-and-chronic-toxicity-risk-analysis-for-cyclic-volatile-methylsiloxanes-comparison-of-hazard-quotient-and-probabilistic-risk-assessment-approaches
#17
Kent B Woodburn, Rita M Seston, Jaeshin Kim, David E Powell
This study utilized probabilistic risk assessment techniques to compare field sediment concentrations of the cyclic volatile methylsiloxane (cVMS) materials octamethylcyclotetrasiloxane (D4, CAS # 556-67-2), decamethylcyclopentasiloxane (D5, CAS # 541-02-6), and dodecamethylcyclohexasiloxane (D6, CAS # 540-97-6) to effect levels for these compounds determined in laboratory chronic toxicity tests with benthic organisms. The concentration data for D4/D5/D6 in sediment were individually sorted and the 95th centile concentrations determined in sediment on an organic carbon (OC) fugacity basis...
October 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/29119317/prodigiosin-violacein-and-volatile-organic-compounds-produced-by-widespread-cutaneous-bacteria-of-amphibians-can-inhibit-two-batrachochytrium-fungal-pathogens
#18
Douglas C Woodhams, Brandon C LaBumbard, Kelly L Barnhart, Matthew H Becker, Molly C Bletz, Laura A Escobar, Sandra V Flechas, Megan E Forman, Anthony A Iannetta, Maureen D Joyce, Falitiana Rabemananjara, Brian Gratwicke, Miguel Vences, Kevin P C Minbiole
Symbiotic bacteria can produce secondary metabolites and volatile compounds that contribute to amphibian skin defense. Some of these symbionts have been used as probiotics to treat or prevent the emerging disease chytridiomycosis. We examined 20 amphibian cutaneous bacteria for the production of prodigiosin or violacein, brightly colored defense compounds that pigment the bacteria and have characteristic spectroscopic properties making them readily detectable, and evaluated the antifungal activity of these compounds...
November 9, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/29115317/computational-study-of-the-dpap-molecular-rotor-in-various-environments-from-force-field-development-to-molecular-dynamics-simulations-and-spectroscopic-calculations
#19
Marina Macchiagodena, Gianluca Del Frate, Giuseppe Brancato, Balasubramanian Chandramouli, Giordano Mancini, Vincenzo Barone
Fluorescent molecular rotors (FMRs) belong to an important class of environment-sensitive dyes capable of acting as nanoprobes in the measurement of viscosity and polarity of their micro-environment. FMRs have found widespread applications in various research fields, ranging from analytical to biochemical sciences, for example in intracellular imaging studies or in volatile organic compound detection. Here, a computational investigation of a recently proposed FMR, namely 4-(diphenylamino)phthalonitrile (DPAP), in various chemical environments is presented...
November 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29113106/headspace-solid-phase-microextraction-and-ultrasonic-extraction-with-the-solvent-sequences-in-chemical-profiling-of-allium-ursinum-l-honey
#20
Igor Jerković, Piotr M Kuś
A volatile profile of ramson (wild garlic, Allium ursinum L.) honey was investigated by headspace solid-phase microextraction (HS-SPME) and ultrasonic solvent extraction (USE) followed by gas chromatography and mass spectrometry (GC-FID/GC-MS) analyses. The headspace was dominated by linalool derivatives: cis- and trans-linalool oxides (25.3%; 9.2%), hotrienol (12.7%), and linalool (5.8%). Besides direct extraction with dichloromethane and pentane/diethyl ether mixture (1:2, v/v), two solvent sequences (I: pentane → diethyl ether; II: pentane → pentane/diethyl ether (1:2, v/v) → dichloromethane) were applied...
November 6, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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