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Volatile organic compound analysis

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https://www.readbyqxmd.com/read/28426293/identifying-thermal-breakdown-products-of-thermoplastics
#1
Marianne Guillemot, Benoît Oury, Sandrine Melin
Polymers processed to produce plastic articles are subjected to temperatures between 150°C and 450°C or more during overheated processing and breakdowns. Heat-based processing of this nature can lead to emission of volatile organic compounds (VOCs) into the thermoplastic processing shop. In this study, laboratory experiments, qualitative and quantitative emissions measurement in thermoplastic factories were carried out. The first step was to identify the compounds released depending on the thermoplastic nature, the temperature and the type of process...
April 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28423218/strain-specific-variation-in-plant-growth-promoting-volatile-organic-compound-production-by-five-different-pseudomonas-spp-as-confirmed-by-response-of-vigna-radiata-seedlings
#2
Jishma P, Nisma Hussain, Rakhi Chellappan, Romy Rajendran, Jyothis Mathew, Radhakrishnan E K
AIM: Analysis of blend of volatile organic compounds (VOCs) released by Pseudomonas spp. with growth promoting effect in Vigna radiata seedlings. METHODS AND RESULTS: Plant growth promoting activity of VOCs produced by five different Pseudomonas spp. was investigated by I-plate technique. VOCs produced by different organisms were extracted by various solvents (methanol, ethyl acetate, hexane and butanol) were identified by gas chromatography-mass spectrometric (GC-MS) analysis...
April 19, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28422253/3d-printed-poly-vinylidene-fluoride-carbon-nanotube-composites-as-a-tunable-low-cost-chemical-vapour-sensing-platform
#3
Z C Kennedy, J F Christ, K A Evans, B W Arey, L E Sweet, M G Warner, R L Erikson, C A Barrett
We report the production of flexible, highly-conductive poly(vinylidene fluoride) (PVDF) and multi-walled carbon nanotube (MWCNT) composites as filament feedstock for 3D printing. This account further describes, for the first time, fused deposition modelling (FDM) derived 3D-printed objects with chemiresistive properties in response to volatile organic compounds. The typically prohibitive thermal expansion and die swell characteristics of PVDF were minimized by the presence of MWCNTs in the composites enabling straightforward processing and printing...
April 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28421982/simultaneous-determination-of-volatile-organic-compounds-in-commercial-alcoholic-beverages-by-gas-chromatography-with-flame-ionization-detection
#4
Hyung Min Kim, Gun Yang, Jung Yoon Kim, Sang Jun Yoon, Byong-Kyu Shin, Jeongmi Lee, Jeong Hill Park, Sung Won Kwon
A simple and fast method was developed for the determination of volatile organic compounds in alcoholic beverages. Eleven volatile organic compounds (acetaldehyde, methanol, 2-propanol, <italic>tert</italic>-butanol, 1-propanol, ethyl acetate, 2-butanol, isobutanol, 1-butanol, 3-methyl-1butanol, and 2-methyl-1-butanol) in alcoholic beverages were analyzed with a simple direct-injection method using GC with flame ionization detection. These compounds should be monitored in the QC of production processes because they are detrimental to human health...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28417171/resolution-optimized-headspace-gas-chromatography-ion-mobility-spectrometry-hs-gc-ims-for-non-targeted-olive-oil-profiling
#5
Natalie Gerhardt, Markus Birkenmeier, Daniel Sanders, Sascha Rohn, Philipp Weller
A prototype gas chromatography-ion mobility spectrometry (GC-IMS) system, hyphenating temperature-ramped headspace GC to a modified drift time IMS cell, was evaluated and compared to a conventional, isothermal capillary column (CC)-IMS system on the example of the geographical differentiation of extra virgin olive oils (EVOO) from Spain and Italy. It allows orthogonal, 2D separation of complex samples and individual detection of compounds in robust and compact benchtop systems. The information from the high-resolution 3D fingerprints of volatile organic compound (VOC) fractions of EVOO samples were extracted by specifically developed chemometric MATLAB® routines to differentiate between the different olive oil provenances...
April 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28408760/fungal-volatile-compounds-induce-production-of-the-secondary-metabolite-sodorifen-in-serratia-plymuthica-pri-2c
#6
Ruth Schmidt, Victor de Jager, Daniela Zühlke, Christian Wolff, Jörg Bernhardt, Katarina Cankar, Jules Beekwilder, Wilfred van Ijcken, Frank Sleutels, Wietse de Boer, Katharina Riedel, Paolina Garbeva
The ability of bacteria and fungi to communicate with each other is a remarkable aspect of the microbial world. It is recognized that volatile organic compounds (VOCs) act as communication signals, however the molecular responses by bacteria to fungal VOCs remain unknown. Here we perform transcriptomics and proteomics analyses of Serratia plymuthica PRI-2C exposed to VOCs emitted by the fungal pathogen Fusarium culmorum. We find that the bacterium responds to fungal VOCs with changes in gene and protein expression related to motility, signal transduction, energy metabolism, cell envelope biogenesis, and secondary metabolite production...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28405774/bacillus-methylotrophicus-m4-96-isolated-from-maize-zea-mays-rhizoplane-increases-growth-and-auxin-content-in-arabidopsis-thaliana-via-emission-of-volatiles
#7
Paola Pérez-Flores, Eduardo Valencia-Cantero, Josué Altamirano-Hernández, Ramón Pelagio-Flores, José López-Bucio, Perla García-Juárez, Lourdes Macías-Rodríguez
Plant growth-promoting rhizobacteria stimulate plant growth and development via different mechanisms. In this study, we characterized the effect of volatiles from Bacillus methylotrophicus M4-96 isolated from the maize rhizosphere on root and shoot development, and auxin homeostasis in Arabidopsis thaliana. Phytostimulation occurred after 4 days of interaction between M4-96 and Arabidopsis grown on opposite sides of divided Petri plates, as revealed by enhanced primary root growth, root branching, leaf formation, and shoot biomass accumulation...
April 12, 2017: Protoplasma
https://www.readbyqxmd.com/read/28403513/a-new-negative-and-positive-gas-ion-source-for-isotope-ratio-mass-spectrometry
#8
Tomasz Pieńkos, Stanisław Halas
RATIONALE: The goal of this research was to construct an effective gas ion source for isotope ratio mass spectrometry, which generates sufficiently strong and stable ion beams for multiple isotope ratio analysis of sulfur and oxygen from readily available gases such as SO2 , CO2 , CO, O2 and chlorine from CH3 Cl gas. METHODS: By means of a 60° sector mass spectrometer equipped with a new type of sensitive ion source and with a dual inlet system and triple collector assembly, we have measured (34) S/(32) S and challenging (36) S/(32) S isotope ratios using positive sulfur ions generated from SO2 gas...
April 12, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28402302/odorous-volatile-organic-compound-voc-emissions-from-ageing-anaerobically-stabilised-biosolids
#9
R M Fisher, R J Barczak, J P Alvarez Gaitan, N Le-Minh, R M Stuetz
Opportunities for the beneficial re-use of biosolids are limited by nuisance odour emissions. Volatile organic compounds (VOCs) from anaerobically stabilised biosolids were measured to identify compounds that could contribute to the overall odour character of nuisance emissions. Flux hood sampling and chemical analysis were used to identify VOCs emitted from biosolids as they were stored in ambient conditions. Compounds emitted varied as the biosolid cakes were stored for a period of 50 days. VOCs detected in the biosolids are likely to occur from catchment sources as well as abiotic and biotic generation in the wastewater processing and the biosolids as they are stored...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28401289/characterization-of-odorants-in-inflatable-aquatic-toys-and-swimming-learning-devices-which-substances-are-causative-for-the-characteristic-odor-and-potentially-harmful
#10
Christoph Wiedmer, Cristina Velasco-Schön, Andrea Buettner
Based on the observation of intense and offensive smells in the product group of aquatic toys, four representative products were exemplarily chosen and sensorially characterized by an expert panel. Panellists reported mostly almond- and rubber-like notes for three of the four samples, whereas the smell of the fourth sample was dominated by organic solvent-associated notes such as "nail polish-like." To elucidate the molecular reasons of these smells, we isolated the volatile fraction of the product by solvent extraction and high vacuum distillation, and identified the main odorants by aroma extract dilution analysis (AEDA), followed by one- and two-dimensional gas chromatography, with parallel mass spectrometric and olfactometric detection...
April 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28401286/identification-of-odorants-in-wood-of-calocedrus-decurrens-torr-florin-by-aroma-extract-dilution-analysis-and-two-dimensional-gas-chromatography-mass-spectrometry-olfactometry
#11
Linda Schreiner, Helene M Loos, Andrea Buettner
General emissions of volatile organic compounds from wood are well investigated, but only limited information is available on the odor-active substances contained therein. To close this gap, we aimed at specifically elucidating the odorous constituents of wood from incense cedar [Calocedrus decurrens (Torr.) Florin]; this material is commonly used for the production of a range of products such as pencils and interior accessories. Targeted odorant analysis requires specialized techniques combining modern odorant analytical tools with human-sensory evaluation...
April 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28399996/microbiota-and-metabolome-during-controlled-and-spontaneous-fermentation-of-nocellara-etnea-table-olives
#12
Cinzia Lucia Randazzo, Aldo Todaro, Alessandra Pino, Iole Pitino, Onofrio Corona, Cinzia Caggia
This study is aimed to investigate bacterial community and its dynamics during the fermentation of Nocellara Etnea table olives and to study its effect on metabolome formation. Six different combination of bacterial cultures (BC1-BC6) were used as starters for table olive fermentation and one additional process, conducted without addition of any starters, was used as control (C). The processes were conducted in triplicate and, overall, 21 vessels were performed at industrial scale. The fermentation was monitored for 120 days through culture-dependent and -independent approaches...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28398534/filth-fly-activity-associated-with-composted-and-noncomposted-beef-cadavers-and-laboratory-studies-on-volatile-organic-compounds
#13
T R Dubie, J L Talley, J B Payne, A W Wayadande, J Dillwith, C Richards
Commercial livestock facilities are faced with the challenge of managing large amounts of waste including manure and animal mortalities. One method of disposing of dead animals is composting. The cadavers are enveloped in carbon material that creates a barrier between the dead tissue and the surrounding environment. Dead tissue can release materials that not only contaminate the soil but also the groundwater and nearby surface water. Animal cadaver composting is designed to facilitate decomposition without the aid of carrion-feeding insects and reduce the presence of common pathogens associated with animal waste and dead tissue...
April 8, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28397711/volatile-organic-compounds-in-exhaled-breath-are-independent-of-systemic-inflammatory-syndrome-caused-by-intravenous-lipopolysaccharide-infusion-in-humans-results-from-an-experiment-in-healthy-volunteers
#14
Anna L Peters, Marije G Gerritsen, Paul Brinkman, Koos A H Zwinderman, Alexander P J Vlaar, Lieuwe D Bos
Systemic inflammatory response syndrome (SIRS) is observed during critical illness in most patients. It is defined by a clinical definition. The composition of volatile organic compounds (VOCs) in exhaled breath may change during SIRS and may thus serve as a diagnostic tool. We investigated whether exhaled breath VOCs can serve as biomarker for SIRS in a human model of endotoxemia. Eighteen healthy volunteers received 2 ng Eschericia coli lipopolysaccharide (LPS) kg(-1) body weight intravenously. Venous blood and exhaled breath were collected before infusion of LPS and every 2 h thereafter, up to 8 h after infusion...
April 11, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28395344/occurrence-of-fumigants-and-hazardous-off-gassing-chemicals-in-shipping-containers-arriving-in-sweden
#15
Urban Svedberg, Gunnar Johanson
Containerized cargo shipment makes up the backbone of international trade. The principal aim of this cross-sectional study was to establish a qualitative and quantitative description of gaseous fumigants and volatile off-gassing substances facing workers tasked with entering shipping containers. A total of 372 packed and 119 empty shipping containers were sampled in six ports and two distribution centers in Sweden. Fourier-transform infrared spectrometry (FTIR) and photoionization detection (PID) were the analytical methods applied to the bulk of samples...
March 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28391862/chemical-and-canine-analysis-as-complimentary-techniques-for-the-identification-of-active-odors-of-the-invasive-fungus-raffaelea-lauricola
#16
Alison G Simon, DeEtta K Mills, Kenneth G Furton
Raffaelea lauricola, a fungus causing a vascular wilt (laurel wilt) in Lauraceae trees, was introduced into the United States in the early 2000s. It has devastated forests in the Southeast and has now moved into the commercial avocado groves in southern Florida. Trained detection canines are currently one of the few successful methods for early detection of pre-symptomatic diseased trees. In order to achieve the universal and frequent training required to have successful detection canines, it is desirable to create accessible, safe, and long-lasting training aids...
June 1, 2017: Talanta
https://www.readbyqxmd.com/read/28391735/diet-derived-changes-by-sourdough-fermented-rye-bread-in-exhaled-breath-aspiration-ion-mobility-spectrometry-profiles-in-individuals-with-mild-gastrointestinal-symptoms
#17
Kaisa Raninen, Jenni Lappi, Mikko Kolehmainen, Marjukka Kolehmainen, Hannu Mykkänen, Kaisa Poutanen, Olavi Raatikainen
The potential of utilising exhaled breath volatile organic compound (VOC) profiles in studying diet-derived metabolic changes was examined. After a four-week initial diet period with white wheat bread (WW), seven participants received in randomised order high-fibre diets containing sourdough whole grain rye bread (WGR) or white wheat bread enriched with bioprocessed rye bran (WW + BRB), both for 4 weeks. Alveolar exhaled breath samples were analysed with ChemPro(®)100i analyser (Environics OY, Mikkeli, Finland) at the end of each diet period in fasting state and after a standardised meal...
April 9, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/28387778/volatile-organic-compounds-concentrations-during-the-construction-process-in-newly-built-timber-frame-houses-source-identification-and-emission-kinetics
#18
H Plaisance, J Vignau-Laulhere, P Mocho, N Sauvat, K Raulin, V Desauziers
Building and furniture materials are known to be major sources of volatile organic compounds (VOCs) indoors. During the construction process, an introduced material can have a more or less long-term impact on the indoor air quality according to the building characteristics. In this study, field measurements were carried out at six construction stages in three energy-efficient timber-frame houses. Data analysis focused on the ten most abundant compounds found among an initial list of fifteen target VOCs, namely formaldehyde, acetaldehyde, hexanal, toluene, m/p-xylenes, ethylbenzene, styrene, α-pinene, 3-carene and d-limonene...
April 7, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28378454/gc-ms-metabolomics-based-approach-for-the-identification-of-a-potential-voc-biomarker-panel-in-the-urine-of-renal-cell-carcinoma-patients
#19
Márcia Monteiro, Nathalie Moreira, Joana Pinto, Ana S Pires-Luís, Rui Henrique, Carmen Jerónimo, Maria de Lourdes Bastos, Ana M Gil, Márcia Carvalho, Paula Guedes de Pinho
The analysis of volatile organic compounds (VOCs) emanating from biological samples appears as one of the most promising approaches in metabolomics for the study of diseases, namely cancer. In fact, it offers advantages, such as non-invasiveness and robustness for high-throughput applications. The purpose of this work was to study the urinary volatile metabolic profile of patients with renal cell carcinoma (RCC) (n = 30) and controls (n = 37) with the aim of identifying a potential specific urinary volatile pattern as a non-invasive strategy to detect RCC...
April 4, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28376835/indoor-air-pollution-and-its-association-with-poor-lung-function-microalbuminuria-and-variations-in-blood-pressure-among-kitchen-workers-in-india-a-cross-sectional-study
#20
Amarnath Singh, Chandrasekharan Nair Kesavachandran, Ritul Kamal, Vipin Bihari, Afzal Ansari, Parappurath Abdul Azeez, Prem Narain Saxena, Anil Kumar Ks, Altaf Hussain Khan
BACKGROUND: The present study is an attempt to explore the association between kitchen indoor air pollutants and physiological profiles in kitchen workers with microalbuminuria (MAU) in north India (Lucknow) and south India (Coimbatore). METHODS: The subjects comprised 145 control subjects, 233 kitchen workers from north India and 186 kitchen workers from south India. Information related to the personal and occupational history and health of the subjects at both locations were collected using a custom-made questionnaire...
April 4, 2017: Environmental Health: a Global Access Science Source
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