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Volatile sulfur compounds

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https://www.readbyqxmd.com/read/28403513/a-new-negative-and-positive-gas-ion-source-for-isotope-ratio-mass-spectrometry
#1
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
#2
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/28400840/comparative-evaluation-of-sulfur-compounds-contents-and-antiobesity-properties-of-allium-hookeri-prepared-by-different-drying-methods
#3
Min Hye Yang, Na-Hyun Kim, Jeong-Doo Heo, Jung-Rae Rho, Kwang Ju Ock, Eui-Cheol Shin, Eun Ju Jeong
Despite the nutritional and medicinal values of Allium hookeri, its unique flavor (onion or garlic taste and smell) coming from sulfur containing compounds limits its usage as functional food. For comparative study, A. hookeri roots were prepared under two different drying conditions, namely, low-temperature drying that minimizes the volatilization of sulfur components and hot-air drying that minimizes the garlic odor and spicy taste of A. hookeri. In GC/MS olfactory system, the odorous chemicals and organosulfur compounds such as diallyl trisulfide, dimethyl trisulfide, and dipropyl trisulfide were significantly decreased in hot-air drying compared to low-temperature drying...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28395265/current-and-future-emissions-of-primary-pollutants-from-coal-fired-power-plants-in-shaanxi-china
#4
Yong Xu, Jianlin Hu, Qi Ying, Hongke Hao, Dexiang Wang, Hongliang Zhang
A high-resolution inventory of primary atmospheric pollutants from coal-fired power plants in Shaanxi in 2012 was built based on a detailed database compiled at unit level involving unit capacity, boiler size and type, commission time, corresponding control technologies, and average coal quality of 72 power plants. The pollutants included SO2, NOx, fine particulate matter (PM2.5), inhalable particulate matter (PM10), organic carbon (OC), elemental carbon (EC), carbon monoxide (CO) and non-methane volatile organic compounds (NMVOC)...
April 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28391664/effect-of-green-tea-added-tablets-on-volatile-sulfur-containing-compounds-in-the-oral-cavity
#5
Pier Francesco Porciani, Simone Grandini
OBJECTIVES: A controlled, clinical, double-blind, cross-over study was conducted to assess the efficacy of sugar-free tablets containing green tea extract on oral volatile sulfur-containing compounds (VSC) versus placebo tablets for 30 minutes. METHODS: To join the study, subjects had to have at least 24 teeth, no report of oral and systemic diseases, and no removable dentures. All eligible participants had to avoid professional oral hygiene and drugs for two weeks, to not be menstruating, to avoid brushing their teeth and tongue, to not smoke, to not consume alcohol, coffee or tea, nor onion, garlic, or licorice for six hours before the test...
December 2016: Journal of Clinical Dentistry
https://www.readbyqxmd.com/read/28365124/contribution-of-the-novel-sulfur-producing-adjunct-lactobacillus-nodensis-to-flavor-development-in-gouda-cheese
#6
Elaine O'Brien, Susan Mills, Alleson Dobson, L Mariela Serrano, John Hannon, Siobhan P Ryan, Kieran N Kilcawley, Johannes B Brandsma, Wilco C Meijer, Colin Hill, R Paul Ross
We assessed the efficacy of Lactobacillus nodensis CSK964 as an adjunct culture in Gouda cheese under various industrial conditions. We set up 4 different systems: a direct vat inoculum with and without adjunct using the calf rennet Kalase, and an undefined bulk starter culture with and without adjunct using the microbial rennet Milase (both rennets from CSK Food Enrichment, Ede, the Netherlands). During ripening, we subjected the cheeses to the following analyses: viability of starter and adjunct cells, composition, proteolysis, and flavor development by detection of sulfur compounds and descriptive sensory analysis...
March 29, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28345694/metal-organic-frameworks-for-the-removal-of-toxic-industrial-chemicals-and-chemical-warfare-agents
#7
REVIEW
N Scott Bobbitt, Matthew L Mendonca, Ashlee J Howarth, Timur Islamoglu, Joseph T Hupp, Omar K Farha, Randall Q Snurr
Owing to the vast diversity of linkers, nodes, and topologies, metal-organic frameworks can be tailored for specific tasks, such as chemical separations or catalysis. Accordingly, these materials have attracted significant interest for capture and/or detoxification of toxic industrial chemicals and chemical warfare agents. In this paper, we review recent experimental and computational work pertaining to the capture of several industrially-relevant toxic chemicals, including NH3, SO2, NO2, H2S, and some volatile organic compounds, with particular emphasis on the challenging issue of designing materials that selectively adsorb these chemicals in the presence of water...
March 27, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28328644/identification-of-key-odorants-in-used-disposable-absorbent-incontinence-products
#8
Gunnar Hall, Susanne Alenljung, Ulla Forsgren-Brusk
PURPOSE: The purpose of this study was to identify key odorants in used disposable absorbent incontinence products. DESIGN: Descriptive in vitro study SUBJECTS AND SETTING:: Samples of used incontinence products were collected from 8 residents with urinary incontinence living in geriatric nursing homes in the Gothenburg area of Sweden. Products were chosen from a larger set of products that had previously been characterized by descriptive odor analysis. METHODS: Pieces of the used incontinence products were cut from the wet area, placed in glass bottles, and kept frozen until dynamic headspace sampling of volatile compounds was completed...
March 22, 2017: Journal of Wound, Ostomy, and Continence Nursing
https://www.readbyqxmd.com/read/28326773/germanium-compounds-containing-ge%C3%A2-e-double-bonds-e-s-se-te-as-single-source-precursors-for-germanium-chalcogenide-materials
#9
Hyo-Suk Kim, Eun Ae Jung, Seong Ho Han, Jeong Hwan Han, Bo Keun Park, Chang Gyoun Kim, Taek-Mo Chung
New germanium chalcogenide precursors, S═Ge(dmamp)2 (3), S═Ge(dmampS)2 (4), Se═Ge(dmamp)2 (5), Se═Ge(dmampS)2 (6), Te═Ge(dmamp)2 (7), and Te═Ge(dmampS)2 (8), were synthesized from Ge(dmamp)2 (1) and Ge(dmampS)2 (2) using sulfur, selenium, and tellurium powders (dmamp = 1-dimethylamino-2-methyl-2-propanolate, dmampS = 1-dimethylamino-2-methylpropane-2-thiolate). Complexes 1 and 2 were synthesized from metathesis reactions of GeCl2·dioxane with 2 equiv of aminoalkoxide or aminothiolate ligands. Thermogravimetric analysis of complex 1 displayed good thermal stability and volatility...
March 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28319129/changes-in-salivary-microbiota-increase-volatile-sulfur-compounds-production-in-healthy-male-subjects-with-academic-related-chronic-stress
#10
Bruno Dias Nani, Patricia Oliveira de Lima, Fernanda Klein Marcondes, Francisco Carlos Groppo, Gustavo Sattolo Rolim, Antonio Bento Alves de Moraes, Karina Cogo-Müller, Michelle Franz-Montan
OBJECTIVE: To investigate the associations among salivary bacteria, oral emanations of volatile sulfur compounds, and academic-related chronic stress in healthy male subjects. MATERIALS AND METHODS: Seventy-eight healthy male undergraduate dental students were classified as stressed or not by evaluation of burnout, a syndrome attributed to academic-related chronic stress. This evaluation was carried out using the Maslach Burnout Inventory-Student Survey questionnaire...
2017: PloS One
https://www.readbyqxmd.com/read/28291597/diel-rhythms-in-the-volatile-emission-of-apple-and-grape-foliage
#11
Valentino Giacomuzzi, Luca Cappellin, Stefano Nones, Iuliia Khomenko, Franco Biasioli, Alan L Knight, Sergio Angeli
This study investigated the diel emission of volatile organic compounds (VOCs) from intact apple (Malus x domestica Borkh., cv. Golden Delicious) and grape (Vitis vinifera L., cv. Pinot Noir) foliage. Volatiles were monitored continuously for 48 h by proton transfer reaction - time of flight - mass spectrometry (PTR-ToF-MS). In addition, volatiles were collected by closed-loop-stripping-analysis (CLSA) and characterized by gas chromatography-mass spectrometry (GC-MS) after 1 h and again 24 and 48 h later...
March 11, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28278029/overview-of-surface-measurements-and-spatial-characterization-of-submicron-particulate-matter-during-the-discover-aq-2013-campaign-in-houston
#12
Y J Leong, N P Sanchez, H W Wallace, B Karakurt Cevik, C S Hernandez, Y Han, J H Flynn, P Massoli, C Floerchinger, E C Fortner, S Herndon, J K Bean, L Hildebrandt Ruiz, W Jeon, Y Choi, B Lefer, R J Griffin
The sources of submicron particulate matter (PM1) remain poorly characterized in the industrialized city of Houston. A mobile sampling approach was used to characterize PM1 composition and concentration across Houston based on high time resolution measurements of non-refractory PM1 and trace gases during the DISCOVER-AQ Texas 2013 campaign. Two pollution zones with marked differences in PM1 levels, character, and dynamics were established based on cluster analysis of organic aerosol mass loadings sampled at sixteen sites...
February 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28260736/recombinant-sox-enzymes-from-paracoccus-pantotrophus-degrade-hydrogen-sulfide-a-major-component-of-oral-malodor
#13
Atik Ramadhani, Miki Kawada-Matsuo, Hitoshi Komatsuzawa, Takahiko Oho
Hydrogen sulfide (H2S) is emitted from industrial activities, and several chemotrophs possessing Sox enzymes are used for its removal. Oral malodor is a common issue in the dental field and major malodorous components are volatile sulfur compounds (VSCs), including H2S and methyl mercaptan. Paracoccus pantotrophus is an aerobic, neutrophilic facultatively autotrophic bacterium that possesses sulfur-oxidizing (Sox) enzymes in order to use sulfur compounds as an energy source. In the present study, we cloned the Sox enzymes of P...
March 31, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28260381/copper-ii-mediated-hydrogen-sulfide-and-thiol-oxidation-to-disulfides-and-organic-polysulfanes-and-their-reductive-cleavage-in-wine-mechanistic-elucidation-and-potential-applications
#14
Gal Y Kreitman, John C Danilewicz, David W Jeffery, Ryan J Elias
Fermentation-derived volatile sulfur compounds (VSCs) are undesirable in wine and are often remediated in a process known as copper fining. In the present study, the addition of Cu(II) to model and real wine systems containing hydrogen sulfide (H2S) and thiols provided evidence for the generation of disulfides (disulfanes) and organic polysulfanes. Cu(II) fining of a white wine spiked with glutathione, H2S, and methanethiol (MeSH) resulted in the generation of MeSH-glutathione disulfide and trisulfane. In the present study, the mechanisms underlying the interaction of H2S and thiols with Cu(II) is discussed, and a prospective diagnostic test for releasing volatile sulfur compounds from their nonvolatile forms in wine is investigated...
March 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28244373/lactic-acid-fermentation-drives-the-optimal-volatile-flavor-aroma-profile-of-pomegranate-juice
#15
Raffaella Di Cagno, Pasquale Filannino, Marco Gobbetti
Pomegranate juice (PJ) fermented with Lactobacillus plantarum C2, POM1, and LP09, unstarted-PJ, and raw-PJ were characterized for the profile of the volatile components (VOC) by PT-GC-MS. Lactic acid fermentation through selected strains enhanced the flavor profile of PJ. Concentrations of desired compounds (e.g., alcohols, ketones, and terpenes) were positively affected, whereas those of non-desired aldehydes decreased. Unstarted-PJ mainly differentiated from fermented PJs for the highest levels of aldehydes and sulfur compounds, and in lesser extent of furans, whereas alcohols, ketones, and alkenes followed by terpenes and benzene derivatives mainly differentiated fermented PJs...
May 2, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28221854/effects-of-fish-derived-biological-preservatives-on-cold-storage-of-grass-carp-ctenopharyngodon-idellus-fillets
#16
Tingting Li, Yang Jiang, Gaowei Jin, Qiancheng Zhao, Jianrong Li
Two kinds of fish-derived natural antimicrobial substances, protamine and catfish ( Clarias fuscus ) epidermal mucus extract (CEME), were evaluated for their effect on the quality of grass carp fillets. Fillets were atmosphere packaged in cast polypropylene bags and were stored at 4°C in a low-temperature incubator without light. Solutions (0.5%, wt/vol) of CEME and protamine were used for dip pretreatment, respectively. Bacteriological (aerobic plate count, Shewanella putrefaciens , Pseudomonas fluorescens ) and physicochemical (pH, total volatile basic nitrogen, K value, surface color, texture profiles, water distribution) parameters and volatile odor compounds were measured on days 0, 3, 6, 9, 12, and 15...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28212110/the-impact-of-chewing-gum-on-halitosis-parameters-a-systematic-review
#17
Francisco Wilker Mustafa Gomes Muniz, Stephanie Anagnostopoulos Friedrich, Carina Folgearini Silveira, Cassiano Kuchenbecker Rösing
This study aimed to analyze the impact of chewing gum on halitosis parameters. Three databases were searched with the following focused question: 'Can chewing gum additionally reduce halitosis parameters, such as organoleptic scores and volatile sulfur compounds (VSC), when compared to a control treatment'? Controlled clinical trials presenting at least two halitosis measurements (organoleptic scores and/or VSC) were included. Ten studies were included, and different active ingredients were used. One study was performed using a chewing gum without any active ingredient...
February 17, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28198438/heterogeneous-nucleation-of-trichloroethylene-ozonation-products-in-the-formation-of-new-fine-particles
#18
Ning Wang, Xiaomin Sun, Jianmin Chen, Xiang Li
Free radicals in atmosphere have played an important role in the atmospheric chemistry. The chloro-Criegee free radicals are produced easily in the decomposition of primary ozonide (POZ) of the trichloroethylene, and can react with O2, NO, NO2, SO2 and H2O subsequently. Then the inorganic salts, polar organic nitrogen and organic sulfur compounds, oxygen-containing heterocyclic intermediates and polyhydroxy compounds can be obtained. The heterogeneous nucleation of oxidation intermediates in the formation of fine particles is investigated using molecular dynamics simulation...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193474/a-new-mouthwash-with-low-concentrations-of-chlorhexidine-seems-to-reduce-intraoral-halitosis-and-volatile-sulfur-compounds-in-patients-after-12-hours-of-use
#19
Romina Brignardello-Petersen
No abstract text is available yet for this article.
February 10, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28157284/mechanisms-of-increased-particle-and-voc-emissions-during-dpf-active-regeneration-and-practical-emissions-considering-regeneration
#20
Hiroyuki Yamada, Satoshi Inomata, Hiroshi Tanimoto
Mechanisms involved in increased particle and volatile organic compound (VOC) emissions during active and parked active regenerations of a diesel particulate filter (DPF) were investigated using heavy-duty trucks equipped with both a urea selective catalytic reduction system and a DPF (SCR + DPF) and a DPF-only. Particle emissions increased in the later part of the regeneration period but the mechanisms were different above and below 23 nm. Particles above 23 nm were emitted due to the lower filtering efficiency of the DPF because of the decreasing amount of soot trapped during regeneration...
February 27, 2017: Environmental Science & Technology
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