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Volatile organic compound analysis

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https://www.readbyqxmd.com/read/28819124/long-term-2001-2013-observations-of-water-soluble-dicarboxylic-acids-and-related-compounds-over-the-western-north-pacific-trends-seasonality-and-source-apportionment
#1
Suresh K R Boreddy, Kimitaka Kawamura, Eri Tachibana
To better understand the impact of East Asian pollutants on the molecular composition of marine organic aerosols, we conducted long-term (2001-2013) observations of water-soluble dicarboxylic acids and related compounds in total suspended particulate samples collected at Chichijima Island in the western North Pacific (WNP). Seasonal variations of all the diacids and related compounds showed maxima in winter and spring and minima in summer, except for azelaic acid (C9), which maximized in summer to autumn. The overall annual concentrations of the total diacids, ω-oxoacids and α-dicarbonyls showed an increase during 2001-2013...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28812956/toxicity-identification-and-evaluation-for-the-effluent-from-a-nonmetallic-mineral-mining-facility-in-korea-using-d-magna
#2
Sungjong Lee, Hongjoo Ha, JinKyung Hong, Guyoung Kang, Chunsang Hong
Industrial wastewater has attracted increasing attention in recent years because of its impact on ecosystems and human health. Whole-effluent tests are generally used to monitor toxicities of unknown chemicals and conventional pollutants from industrial effluent discharges. This study described identification evaluation (TIE) procedures to determine the acute toxicity of a nonmetallic mineral mining facility effluent that was toxic to Daphnia magna. In the characterization step (TIE phase I), toxic effects of heavy metals, organic compounds, oxidants, volatile organic compounds, suspended solids, and ammonia were screened...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28803260/microbial-volatile-compounds-alter-the-soil-microbial-community
#3
Jun Yuan, Mengli Zhao, Rong Li, Qiwei Huang, Waseem Raza, Christopher Rensing, Qirong Shen
Volatile organic compounds (VOCs) from soil bacteria are likely to have an important role in the interactions among soil microorganisms. However, their effects on the soil microbial community have not been extensively studied. In this study, the effect of bacterial VOCs generated by growing Bacillus amyloliquefaciens NJN-6 on modified MS medium on soil microbial community was evaluated. B. amyloliquefaciens NJN-6 was able to produce 48 volatile compounds as determined by solid-phase microextraction-GC/MS. MiSeq sequencing data showed that bacterial VOCs could alter the composition of both soil bacterial and soil fungal communities and could decrease the alpha-diversity of the soil microbial community...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28795953/diagnostic-accuracy-of-breath-tests-for-pneumoconiosis-using-an-electronic-nose
#4
Pau-Chung Chen, Hsin-Yi Peng, Che-Jui Chang, Hsiao-Yu Yang
Breath analyses have attracted substantial attention as screens for occupational environmental lung disease. The objective of this study was to develop breath tests for pneumoconiosis by analysing volatile organic compounds using an electronic nose. A case-control study was designed. We screened 102 subjects from a cohort of stone workers. After excluding three subjects with poorly controlled diabetes mellitus and one subject with asthma, 98 subjects were enrolled, including 34 subjects with pneumoconiosis and 64 healthy controls...
August 10, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28783535/the-individual-contribution-of-starter-and-non-starter-lactic-acid-bacteria-to-the-volatile-organic-compound-composition-of-caciocavallo-palermitano-cheese
#5
Valeria Guarrasi, Ciro Sannino, Marta Moschetti, Adriana Bonanno, Antonino Di Grigoli, Luca Settanni
The contribution of two starter (Lactobacillus delbrueckii and Streptococcus thermophilus) and nine non-starter (Enterococcus casselliflavus, Enterococcus faecalis, Enterococcus durans, Enterococcus gallinarum, Lactobacillus casei, Lactobacillus paracasei, Lactobacillus rhamnosus, Pediococcus acidilactici and Pediococcus pentosaceus) species of lactic acid bacteria (LAB) to the volatile organic compounds (VOCs) of Caciocavallo Palermitano cheese was investigated. The strains used in this study were isolated during the production/ripening of the stretched cheese and tested in a cheese-based medium (CBM)...
July 31, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28782138/a-cautionary-note-on-the-effects-of-laboratory-air-contaminants-on-ambient-ionization-mass-spectrometry-measurements
#6
Sambhav R Kumbhani, Lisa M Wingen, Véronique Perraud, Barbara J Finlayson-Pitts
RATIONALE: Ambient ionization mass spectrometry methods are convenient, sensitive and require little sample preparation. However, they are susceptible to species present in air surrounding the mass spectrometer. This study identifies some challenges associated with the potential impacts of indoor air contaminants on ionization and analysis involving open air methods. METHODS: Unexpected effects of volatile organic compounds from floor maintenance activities on ambient ionization mass spectrometry were studied using three different ambient ionization techniques...
August 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28780675/peat-moss-derived-biochars-as-effective-sorbents-for-vocs-removal-in-groundwater
#7
Jeonggwan Kim, Sang Soo Lee, Jeehyeong Khim
Peat moss-derived biochars were produced at the pyrolytic temperatures of 300, 500, and 700 °C and were tested for evaluating the removal efficiency of volatile organic compounds (VOCs) from waters. As the pyrolytic temperature increases, the carbon contents were increased from 66 to 84%, and the contents of hydrogen and oxygen were decreased from 4 to 1% and from 19 to 4%, respectively. The surface areas of the biochars were 2 m(2) g(-1) at the pyrolysis temperature of 300 °C and were increased to 200 and 300 m(2) g(-1) at 500 and 700 °C, respectively...
August 5, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28780568/biomass-smoke-exposure-as-an-occupational-risk-cross-sectional-study-of-respiratory-health-of-women-working-as-street-cooks-in-nigeria
#8
Olayemi Fehintola Awopeju, Benoit Nemery, Olusegun Tope Afolabi, Katrien Poels, Jeroen Vanoirbeek, Daniel Osagbemworhue Obaseki, Olufemi Olanisun Adewole, Hervé Anicet Lawin, William Vollmer, Gregory Efosa Erhabor
OBJECTIVE: Little is known about respiratory health of women who are occupationally exposed to biomass smoke outside their homes. This study reports the exposure and respiratory health of street cooks in Ile-Ife, Nigeria. METHODS: We assessed exposure to biomass smoke by questionnaire in 188 street cooks and 197 control women and by personal diffusive samplers to quantify volatile organic compounds (VOCs) in a subsample of the women. Respiratory symptoms were assessed by a standardised questionnaire, and pulmonary function was assessed by spirometry before and after bronchodilation...
August 5, 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28774618/showering-in-flint-mi-is-there-a-dbp-problem
#9
Joshua M Allen, Amy A Cuthbertson, Hannah K Liberatore, Susana Y Kimura, Anurag Mantha, Marc A Edwards, Susan D Richardson
Lead contamination in the City of Flint, MI has been well documented over the past two years, with lead levels above the EPA Action Level until summer 2016. This resulted from an ill-fated decision to switch from Detroit water (Lake Huron) with corrosion control, to Flint River water without corrosion control. Although lead levels are now closer to normal, reports of skin rashes have sparked questions surrounding tap water in some Flint homes. This study investigated the presence of contaminants, including disinfection by-products (DBPs), in the hot tap water used for showering in the homes of residents in Flint...
August 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28768897/strategies-for-the-identification-of-disease-related-patterns-of-volatile-organic-compounds-prediction-of-paratuberculosis-in-an-animal-model-using-random-forests
#10
Elisa Kasbohm, Sina Fischer, Anne Küntzel, Peter Oertel, Andreas Bergmann, Phillip Trefz, Wolfram Miekisch, Jochen Schubert, Petra Reinhold, Mario Ziller, Andreas Fröhlich, Volkmar Liebscher, Heike Köhler
Recently, modern statistical methods which were developed for automated pattern recognition are being used increasingly for data analysis in studies on emissions of volatile organic compounds (VOCs). With the detection of disease-related VOC profiles, novel non-invasive diagnostic tools could be developed for clinical applications. However, it is important to bear in mind that not all statistical methods are suited for the investigation of VOC profiles. In particular univariate methods are not able to discover VOC patterns as they consider each compound separately...
August 3, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28768105/exhaled-breath-markers-for-nonimaging-and-noninvasive-measures-for-detection-of-multiple-sclerosis
#11
Yoav Y Broza, Lior Har-Shai, Raneen Jeries, John C Cancilla, Lea Glass-Marmor, Izabella Lejbkowicz, José S Torrecilla, Xuelin Yao, Xinliang Feng, Akimitsu Narita, Klaus Müllen, Ariel Miller, Hossam Haick
Multiple sclerosis (MS) is the most common chronic neurological disease affecting young adults. MS diagnosis is based on clinical characteristics and confirmed by examination of the cerebrospinal fluids (CSF) or by magnetic resonance imaging (MRI) of the brain or spinal cord or both. However, neither of the current diagnostic procedures are adequate as a routine tool to determine disease state. Thus, diagnostic biomarkers are needed. In the current study, a novel approach that could meet these expectations is presented...
August 16, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28765001/xad-2-a-useful-alternative-to-tenax-ta-for-analysis-of-biogenic-volatiles-employing-thermal-desorption-coupled-with-gas-chromatography-mass-spectrometry
#12
Andrea Marcillo, Viktorija Jakimovska, Anja Widdig, Claudia Birkemeyer
Volatile organic compounds (VOCs) are commonly collected from gaseous samples by adsorption to materials such as the porous polymer Tenax TA. Adsorbed compounds are subsequently released from these materials by thermal desorption (TD) and separated then by gas chromatography (GC) with flame ionization (FID) or mass spectrometry (MS) detection. Tenax TA is known to be particularly suitable for non-polar to semipolar volatiles, however, many volatiles from environmental and biological samples possess a rather polar character...
July 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28764052/flavour-production-by-saprochaete-and-geotrichum-yeasts-and-their-close-relatives
#13
Eric Grondin, Alain Shum Cheong Sing, Steve James, Carmen Nueno-Palop, Jean Marie François, Thomas Petit
In this study, a total of 30 yeast strains belonging to the genera Dipodascus, Galactomyces, Geotrichum, Magnusiomyces and Saprochaete were investigated for volatile organic compound production using HS-SPME-GC/MS analysis. The resulting flavour profiles, including 36 esters and 6 alcohols compounds, were statistically evaluated by cluster and PCA analysis. Two main groups of strains were extracted from this analysis, namely a group with a low ability to produce flavour and a group producing mainly alcohols...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28763994/covering-the-different-steps-of-the-coffee-processing-can-headspace-voc-emissions-be-exploited-to-successfully-distinguish-between-arabica-and-robusta
#14
Ilaria Colzi, Cosimo Taiti, Elettra Marone, Susanna Magnelli, Cristina Gonnelli, Stefano Mancuso
This work was performed to evaluate the possible application of PTR-ToF-MS technique in distinguishing between Coffea arabica (Arabica) and Coffea canephora var. robusta (Robusta) commercial stocks in each step of the processing chain (green beans, roasted beans, ground coffee, brews). volatile organic compounds (VOC) spectra from coffee samples of 7 Arabica and 6 Robusta commercial stocks were recorded and submitted to multivariate statistical analysis. Results clearly showed that, in each stage of the coffee processing, the volatile composition of coffee is highly influenced by the species...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28763982/microbial-cell-free-extracts-affect-the-biochemical-characteristics-and-sensorial-quality-of-sourdough-bread
#15
Noemi Cavallo, Maria De Angelis, Maria Calasso, Maurizio Quinto, Annalisa Mentana, Fabio Minervini, Stefan Cappelle, Marco Gobbetti
This study aimed to improve the sensorial quality of sourdough wheat bread by the addition of cell-free enzyme extracts (CFEs) from Lactobacillus sanfranciscensis (SF), Hafnia alvei (HF) and Debaryomyces hansenii (DH). CFEs were suitable sources of peptidases, glutamate dehydrogenase and cystathionine γ-lyase. The concentration of free amino acids (FAA) in the sourdoughs containing CFEs was higher than the control sourdough, produced without addition of CFEs. The community-level catabolic profiles showed that the highest number of carbohydrates, polymers and carboxylic acids were consumed in the SF sourdough...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28763941/assessment-of-biodegradation-potential-at-a-site-contaminated-by-a-mixture-of-btex-chlorinated-pollutants-and-pharmaceuticals-using-passive-sampling-methods-case-study
#16
Ondřej Lhotský, Eva Krákorová, Lucie Linhartová, Zdena Křesinová, Jana Steinová, Lukáš Dvořák, Torgeir Rodsand, Alena Filipová, Kristýna Kroupová, Lenka Wimmerová, Jan Kukačka, Tomáš Cajthaml
The present study describes a pilot remediation test of a co-mingled plume containing BTEX, chlorinated pollutants and pharmaceuticals. Remediation was attempted using a combination of various approaches, including a pump and treat system applying an advanced oxidation process and targeted direct push injections of calcium peroxide. The remediation process was monitored intensively and extensively throughout the pilot test using various conventional and passive sampling methods, including next-generation amplicon sequencing...
July 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28763683/semiquantitative-screening-of-trace-combustion-derived-volatile-substances-in-the-blood-of-fire-victims-using-needlex-%C3%A2-headspace-gas-chromatography-mass-spectrometry
#17
Yasuhito Suzuki, Fujio Ishizawa, Katsuya Honda
BACKGROUND: Various autopsy findings are used for the diagnosis of burning death, including inhalation injury, soot in the respiratory tract, vital reaction, blood carboxyhemoglobin (COHb), and blood cyanide. However, not all findings are necessarily complete, and autopsy diagnosis can be difficult in cases where there are few findings. In this study, we analyzed combustion-derived volatile substances (CVSs) in post-mortem blood in fire-related cases, focusing on those that occur when buildings and furniture thermally decompose during a fire, and evaluated these as potential new autopsy findings...
July 18, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28763042/optimization-of-a-voc-sensor-with-a-bilayered-diaphragm-using-fbar-as-strain-sensing-elements
#18
Huihui Guo, Aohui Guo, Yang Gao, Tingting Liu
Film bulk acoustic resonators (FBARs) are widely applied in mass bio-sensing and pressure sensors, owing to their extreme sensitivity and integration ability, and ability to miniaturize circuits. A volatile organic compound (VOC) sensor with a polymer-coated diaphragm, using FBARs as a strain sensing element is proposed and optimized. This vapor sensor is based on organic vapor-induced changes of mechanical deformation of the micro-diaphragm. The four FBARs are located at the edge of the bi-layer diaphragm comprising silicon nitride and silicon oxide for strain extraction...
August 1, 2017: Sensors
https://www.readbyqxmd.com/read/28753948/selective-detection-of-target-volatile-organic-compounds-in-contaminated-humid-air-using-a-sensor-array-with-principal-component-analysis
#19
Toshio Itoh Takafumi Akamatsu, Akihiro Tsuruta, Woosuck Shin
We investigated selective detection of the target volatile organic compounds (VOCs) nonanal, n-decane, and acetoin for lung cancer-related VOCs, and acetone and methyl i-butyl ketone for diabetes-related VOCs, in humid air with simulated VOC contamination (total concentration: 300 μg/m³). We used six "grain boundary-response type" sensors, including four commercially available sensors (TGS 2600, 2610, 2610, and 2620) and two Pt, Pd, and Au-loaded SnO₂ sensors (Pt, Pd, Au/SnO₂), and two "bulk-response type" sensors, including Zr-doped CeO₂ (CeZr10), i...
July 19, 2017: Sensors
https://www.readbyqxmd.com/read/28752074/co-liquefaction-with-acetone-and-gc-analysis-of-volatile-compounds-in-exhaled-breath-as-lung-cancer-biomarkers
#20
Abolghasem Jouyban, Djavanshir Djozan, Parastou Mohammadandashti, Aliakbar Alizadeh-Nabil, Hooshangh Ghorbanpour, Maryam Khoubnasabjafari, Mohammad Mohammadzadeh
Introduction: A simple, rapid and low cost method for enrichment of volatile organic compounds (VOCs) from exhaled breath (EB) is presented. Methods: A 1000 mL home-made extraction device was filled with EB. The VOCs were extracted and condensed in 0.5 mL acetone. Recognition of volatiles in the real studied EB samples was performed by a GC-MS. Results: The method displays an extraction efficiency of >86% with the enrichment factor of 1929 for octanal. Limits of detection and quantification, and linear dynamic range were 0...
2017: BioImpacts: BI
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