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Volatile organic compounds

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https://www.readbyqxmd.com/read/28738625/the-screening-of-organic-matter-in-mineral-and-tap-water-by-uhplc-hrms
#1
Marcos A S Ribeiro, Michael Murgu, Valquíria de Moraes Silva, Alexandra C H F Sawaya, Leomara Floriano Ribeiro, Andre Justi, Eduardo C Meurer
It is highly desirable to screen for a large variety of organic compounds in water. Ultra-high performance liquid chromatography coupled to high-resolution mass spectrometry (UHPLC-HRMS) can analyse semi-polar to polar organic compounds in tap and mineral water. The use of UHPLC-HRMS is well consolidated for lipidomic, metabolomic and proteomic studies; based on the detection of a very large number of compounds of a variety of organic functions. Water analysis is usually performed by gas chromatography -mass spectrometry (GC-MS) techniques that are efficient for volatile organic compounds...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738527/evaluation-of-heavy-metal-mobilization-in-creek-sediment-influence-of-rac-values-and-ambient-environmental-factors
#2
Guannan Liang, Bo Zhang, Mao Lin, Simiao Wu, Hao Hou, Jia Zhang, Guangren Qian, Xin Huang, Jizhi Zhou
The risk assessment code (RAC) is a common method for assessing heavy metal (HM) mobility and their potential health risks, based on HM total concentration and chemical speciation. In this study, both the RAC and the influence of ambient environmental factors were investigated in a river sediment system. Sixty-eight sediment samples were collected from the main river system in Shanghai, China. The total concentration and chemical speciation of Cu, Zn, Ni, Pb, Cd, Cr, As, and Hg were determined in the samples...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28737423/mass-spectrometric-techniques-for-the-analysis-of-volatile-organic-compounds-emitted-from-bacteria
#3
Ileana-Andreea Ratiu, Tomasz Ligor, Victor Bocos-Bintintan, Bogusław Buszewski
Bacteria are the main cause of many human diseases. Typical bacterial identification methods, for example culture-based, serological and genetic methods, are time-consuming, delaying the potential for an early and accurate diagnosis and the appropriate subsequent treatment. Nevertheless, there is a stringent need for in situ tests that are rapid, noninvasive and sensitive, which will greatly facilitate timely treatment of the patients. This review article presents volatile organic metabolites emitted from various micro-organism strains responsible for common bacterial infections in humans...
July 24, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28736050/effects-of-aeration-and-leachate-recirculation-on-methyl-mercaptan-emissions-from-landfill
#4
Siyuan Zhang, Yuyang Long, Yuan Fang, Yao Du, Weijia Liu, Dongsheng Shen
The issue of odorous volatile organic sulfur compound methyl mercaptan (MM) released from landfill sites cannot be ignored for its extremely low odor threshold and high toxicity. In this study, we focused on the formation and emission of MM in four lab-scaled simulated landfill reactors running in different operation modes, namely, R1 and R2, without leachate recirculation, running under anaerobic and semi-aerobic atmosphere, R3 and R4, with leachate recirculation, running under anaerobic and semi-aerobic atmosphere, respectively...
July 20, 2017: Waste Management
https://www.readbyqxmd.com/read/28734603/determination-of-volatile-organic-compounds-in-pen-inks-by-a-dynamic-headspace-needle-trap-device-combined-with-gas-chromatography-mass-spectrometry
#5
Xiaohuan Zang, Weiqian Liang, Qingyun Chang, Tong Wu, Chun Wang, Zhi Wang
Some harmful volatile organic compounds (VOCs), such as methylbenzene, ethylbenzene, xylene, chlorobenzene and bromobenzene, are the commonly found chemicals in pen inks. In this work, a dynamic headspace needle-trap device (D-HS-NTD) with a ZIF-8-derived nanoporous carbon (ZIF-8-NPC) as the adsorbent was developed for the extraction of some VOCs in different pen inks prior to GC-MS detection. The main important influencing experimental parameters including the flow rate of the purge gas N2, extraction temperature, extraction time, desorption temperature and desorption time for the extraction were optimized to obtain a high extraction efficiency...
July 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28734266/air-quality-and-health-effects-of-biogenic-volatile-organic-compounds-emissions-from-urban-green-spaces-and-the-mitigation-strategies
#6
Yuan Ren, Zelong Qu, Yuanyuan Du, Ronghua Xu, Danping Ma, Guofu Yang, Yan Shi, Xing Fan, Akira Tani, Peipei Guo, Ying Ge, Jie Chang
Biogenic volatile organic compounds (BVOCs) emissions lead to fine particulate matter (PM2.5) and ground-level ozone pollution, and are harmful to human health, especially in urban areas. However, most BVOCs estimations ignored the emissions from urban green spaces, causing inaccuracies in the understanding of regional BVOCs emissions and their environmental and health effects. In this study, we used the latest local vegetation datasets from our field survey and applied an estimation model to analyze the spatial-temporal patterns, air quality impacts, health damage and mitigating strategies of BVOCs emissions in the Greater Beijing Area...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28733965/molecular-communication-over-gas-stream-channels-using-portable-mass-spectrometry
#7
Stamatios Giannoukos, Alan Marshall, Stephen Taylor, Jeremy Smith
The synthetic generation/coding and transmission of olfactory information over a gas stream or an odor network is a new and unexplored field. Application areas vary from the entertainment or advertisement industry to security and telemedicine. However, current technological limitations frustrate the accurate reproduction of decoded and transmitted olfactory data. This study describes the development, testing, and characterization of a novel odor emitter (OE) that is used to investigate the generation-encoding of gaseous standards with odorous characteristics with a regulatable way, for scent transmission purposes...
July 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28728788/emission-characteristics-and-variation-of-volatile-odorous-compounds-in-the-initial-decomposition-stage-of-municipal-solid-waste
#8
Haobo Tan, Yan Zhao, Yue Ling, Ying Wang, Xuemei Wang
The odour pollution occurring in the initial decomposition stage of municipal solid waste (MSW), including collection, transfer and transportation, has not been sufficiently emphasised. Thus the emission characteristics of and variation in odorant generation in this stage were investigated through simulation experiments at different temperatures, waste composition and processing durations. Out of 120 odorous compounds, 52 were detected in seven categories under all tested conditions, with significant variations...
July 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28727415/hydrophobic-nanosized-all-silica-beta-zeolite-efficient-synthesis-and-adsorption-application
#9
Zhiguo Zhu, Hao Xu, Jingang Jiang, Hai-Hong Wu, Peng Wu
All-silica Beta zeolite, synthesized by conventional hydroxide route, usually possesses small crystal size of a few hundred nanometers but poor hydrophobicity, whereas the fluoride-mediated one exhibits to be highly hydrophobic but microsized. To obtain nanosized all-silica Beta zeolite with excellent hydrophobicity, an innovative and efficient hydrothermal route via interzeolite transformation for synthesizing all-silica Beta zeolite is proposed in present study. With the assistance of Beta seeds and tetraethylammonium hydroxide as the structure-directing agent, siliceous Beta zeolite is well crystallized at a high solid yield via dissolution-recrystallization of all-silica ITQ-1 crystals at an extremely low water content (H2O/SiO2 molar ratio of 1)...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28727229/volatile-organic-compound-detection-as-a-potential-means-of-diagnosing-cutaneous-wound-infections
#10
Mohammed Ashrafi, Matt Bates, Mohamed Baguneid, Teresa Alonso-Rasgado, Riina Rautemaa-Richardson, Ardeshir Bayat
Chronic cutaneous wound infections and surgical site infections (SSIs) present a huge burden on the healthcare system and can lead to increased morbidity and mortality. Current diagnostic methods of identifying and confirming infection involve culture-based and molecular methods. Both techniques are time consuming and delays commonly lead to un-targeted empirical treatment. An ideal diagnostic method would be non-invasive and highly sensitive and detect pathogenic organisms with a high degree of accuracy in order to allow targeted treatment...
July 20, 2017: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/28725238/a-non-targeted-metabolomics-approach-unravels-the-vocs-associated-with-the-tomato-immune-response-against-pseudomonas-syringae
#11
María Pilar López-Gresa, Purificación Lisón, Laura Campos, Ismael Rodrigo, José Luis Rambla, Antonio Granell, Vicente Conejero, José María Bellés
Volatile organic compounds (VOCs) emitted by plants are secondary metabolites that mediate the plant interaction with pathogens and herbivores. These compounds may perform direct defensive functions, i.e., acting as antioxidant, antibacterial, or antifungal agents, or indirectly by signaling the activation of the plant's defensive responses. Using a non-targeted GC-MS metabolomics approach, we identified the profile of the VOCs associated with the differential immune response of the Rio Grande tomato leaves infected with either virulent or avirulent strains of Pseudomonas syringae DC3000 pv...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28722446/hierarchical-morphology-dependent-gas-sensing-performances-of-three-dimensional-sno2-nanostructures
#12
Yi-Xiang Li, Zheng Guo, Yao Su, Xiao-Bo Jin, Xiang-Hu Tang, Jia-Rui Huang, Xing-Jiu Huang, Min-Qiang Li, Jin-Huai Liu
Hierarchical morphology-dependent gas-sensing performances have been demonstrated for three-dimensional SnO2 nanostructures. First, hierarchical SnO2 nanostructures assembled with ultrathin shuttle-shaped nanosheets have been synthesized via a facile and one-step hydrothermal approach. Due to thermal instability of hierarchical nanosheets, they are gradually shrunk into cone-shaped nanostructures and finally deduced into rod-shaped ones under a thermal treatment. Given the intrinsic advantages of three-dimensional hierarchical nanostructures, their gas-sensing properties have been further explored...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722426/tunable-volatile-organic-compound-sensor-by-using-au-nanoparticle-incorporation-on-mos2
#13
Soo-Yeon Cho, Hyeong-Jun Koh, Hae-Wook Yoo, Jong-Seon Kim, Hee-Tae Jung
Controlling the charge concentrations of two-dimensional (2D) materials is a critical requirement for realizing versatility and potential application of these materials in high-performance electronics and sensors. In order to exploit the novel chemical-sensing characteristics of 2D materials for sensitive and selective sensors, various functionalization methods are needed to ensure efficient doping of channels based on 2D materials. In the present study, the gas-sensing performance of MoS2 has been significantly enhanced by controlled Au nanoparticle functionalization...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28715749/self-assembly-of-zinc-hydroxystannate-on-amorphous-hydrous-tio2-solid-sphere-for-enhancing-fire-safety-of-epoxy-resin
#14
Wei Wang, Yongchun Kan, Jiajia Liu, Kim Meow Liew, Lei Liu, Yuan Hu
Zinc hydroxystannate (ZHS) was fabricated on the surface of amorphous hydrous TiO2 solid spheres (AHTSS) via a layer-by-layer method for improving the fire safety of epoxy resin. AHTSS@PEI@ZHS was prepared by self-assembly of AHTSS, PEI and ZHS. The well-organized fabrication process was proved by TEM, XPS, XRD and SEM tests. TG results illustrated that the incorporation of AHTSS@PEI@ZHS show a higher residue compared with the addition of AHTSS or ZHS alone. In addition, AHTSS@PEI@ZHS filled EP composites exhibits improved flame retardancy and smoke suppression properties evaluated by cone calorimeter test...
June 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28714305/a-spme-based-ca-history-method-for-measuring-svoc-diffusion-coefficients-in-clothing-material
#15
Jianping Cao, Ningrui Liu, Yinping Zhang
Clothes play an important role in dermal exposure to indoor semi-volatile organic compounds (SVOCs). The diffusion coefficient of SVOCs in clothing material (Dm) is essential for estimating SVOC sorption by clothing material and subsequent dermal exposure to SVOCs. However, few studies have reported the measured Dm for clothing materials. In this paper, we present the solid-phase micro-extraction (SPME) based Ca-history method. To the best of our knowledge, this is the first try to measure Dm with known relative standard deviation (RSD)...
July 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28712086/pilot-study-investigating-ambient-air-toxics-emissions-near-a-canadian-kraft-pulp-and-paper-facility-in-pictou-county-nova-scotia
#16
Emma Hoffman, Judith R Guernsey, Tony R Walker, Jong Sung Kim, Kate Sherren, Pantelis Andreou
Air toxics are airborne pollutants known or suspected to cause cancer or other serious health effects, including certain volatile organic compounds (VOCs), prioritized by the US Environmental Protection Agency (EPA). While several EPA-designated air toxics are monitored at a subset of Canadian National Air Pollution Surveillance (NAPS) sites, Canada has no specific "air toxics" control priorities. Although pulp and paper (P&P) mills are major industrial emitters of air pollutants, few studies quantified the spectrum of air quality exposures...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28709981/relative-toxicity-for-indoor-semi-volatile-organic-compounds-based-on-neuronal-death
#17
Kevin Fournier, Emmanuel Baumont, Philippe Glorennec, Nathalie Bonvallot
BACKGROUND: Semi Volatile Organic Compounds (SVOCs) are contaminants commonly found in dwellings as a result of their use as plasticizers, flame retardants, or pesticides in building materials and consumer products. Many SVOCs are suspected of being neurotoxic, based on mammal experimentation (impairment of locomotor activity, spatial learning/memory or behavioral changes), raising the question of cumulative risk assessment. The aim of this work is to estimate the relative toxicity of such SVOCs, based on neuronal death...
July 11, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28709937/detection-of-lung-cancer-and-egfr-mutation-by-electronic-nose-system
#18
Dekel Shlomi, Manal Abud, Ori Liran, Jair Bar, Naomi Gai-Mor, Maya Ilouze, Amir Onn, Alon Ben-Nun, Hossam Haick, Nir Peled
BACKGROUND: Early detection of lung cancer (LC) has been well established as a significant key point in patient survival and prognosis. New highly sensitive nanoarray sensors for exhaled Volatile Organic Compounds (VOCs) have been developed and coupled with powerful statistical programs may be used when diseases such as LC are suspected. Detection of genetic aberration mutation by nanoarray sensors is the next target. METHODS: Breath samples were taken from patients who were evaluated for suspicious pulmonary lesions...
July 11, 2017: Journal of Thoracic Oncology
https://www.readbyqxmd.com/read/28709105/fundamental-mechanisms-and-reactions-in-non-catalytic-subcritical-hydrothermal-processes-a-review
#19
REVIEW
Azadeh Yousefifar, Saeid Baroutian, Mohammed M Farid, Daniel J Gapes, Brent R Young
The management and disposal of solid waste is of increasing concern across the globe. Hydrothermal processing of sludge has been suggested as a promising solution to deal with the considerable amounts of sludge produced worldwide. Such a process not only degrades organic compounds and reduces waste volume, but also provides an opportunity to recover valuable substances. Hydrothermal processing comprises two main sub-processes: wet oxidation (WO) and thermal hydrolysis (TH), in which the formation of various free radicals results in the production of different intermediates...
June 30, 2017: Water Research
https://www.readbyqxmd.com/read/28701654/volatile-compounds-from-the-different-organs-of-houttuynia-cordata-and-litsea-cubeba-l-citriodora
#20
Yoshinori Asakawa, Kenichi Tomiyama, Kazutoshi Sakurai, Yukihiro Kawakami, Yoshihiro Yaguchi
The volatile compounds obtained from the different organs of Houttuynia cordata (Saururaceae) and Litsea cubeba (Lauraceae) were analyzed by Gas Chromatography/Mass Spectrometry (GC/MS), Headspace Solid Phase Micro Extraction-Gas Chromatography/Mass Spectrometry (HS-SPME-GC/MS), and GC/olfactometry (GC/O). The major component of all parts of H. cordata is assigned as 4-tridecanone. Each organ produces myrcene as the major monoterpenoid. The major monoterpene in the rhizomes and roots was β-pinene instead of myrcene...
July 12, 2017: Journal of Oleo Science
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