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Volatile sulfur compounds

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https://www.readbyqxmd.com/read/28512650/effect-of-antimicrobial-photodynamic-therapy-%C3%A2-and-laser-alone-as-adjunct-to-mechanical-debridement-in-the-management-of-halitosis-a-systematic-review
#1
Sergio Varela Kellesarian, Vanessa Ros Malignaggi, Abdulaziz A Al-Kheraif, Mansour Al-Askar, Michael Yunker, Fawad Javed
OBJECTIVE: The aim of the present study was to assess the efficacy of laser therapy (LT) and antimicrobial photodynamic therapy (aPDT) as adjunct to mechanical debridement (MD) on the management of halitosis. DATA SOURCES: In order to address the focused question "Is MD with adjunct LT and/or aPDT more effective in the management of halitosis compared with MD alone?" an electronic search without time or language restrictions was conducted up to January 2017 in indexed databases using the combination of different key words including photochemotherapy, lasers, light, photodynamic therapy, halitosis, and bad breath...
May 16, 2017: Quintessence International
https://www.readbyqxmd.com/read/28494291/distribution-and-sensorial-relevance-of-volatile-organic-compounds-emitted-throughout-wastewater-biosolids-processing
#2
R M Fisher, N Le-Minh, E C Sivret, J P Alvarez-Gaitan, S J Moore, R M Stuetz
A diverse range of volatile organic compounds (VOCs) are emitted from wastewater biosolids processing. Odorous emissions are predominately made up of volatile sulfur compounds (VSCs) which are typically the only odorants measured. However, a range of VOCs are known to contribute to malodours yet previous studies often overlook the contribution of VOCs in comparison with VSCs. This study aims to evaluate how emissions are affected by different biosolids processing configurations, and if any non-sulfur VOCs should be included in odour measurement and management...
May 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28490149/aroma-profile-and-sensory-characteristics-of-a-sulfur-dioxide-free-mulberry-morus-nigra-wine-subjected-to-non-thermal-accelerating-aging-techniques
#3
William Tchabo, Yongkun Ma, Emmanuel Kwaw, Haining Zhang, Lulu Xiao, Haroon Elrasheid Tahir
The present study was undertaken to assess accelerating aging effects of high pressure, ultrasound and manosonication on the aromatic profile and sensorial attributes of aged mulberry wines (AMW). A total of 166 volatile compounds were found amongst the AMW. The outcomes of the investigation were presented by means of geometric mean (GM), cluster analysis (CA), principal component analysis (PCA), partial least squares regressions (PLSR) and principal component regression (PCR). GM highlighted 24 organoleptic attributes responsible for the sensorial profile of the AMW...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28472208/ambient-air-pollution-and-risk-of-gestational-hypertension
#4
Yeyi Zhu, Cuilin Zhang, Danping Liu, Sandie Ha, Sung Soo Kim, Anna Pollack, Pauline Mendola
Air pollution has been linked to hypertension in the general population, but data on gestational hypertension (GH) are limited. We investigated air pollutants and toxics during preconception and early gestation in relation to GH risk in the Consortium on Safe Labor/Air Quality and Reproductive Health Study (2002-2008). Modified Community Multiscale Air Quality models estimated air pollution exposures among 6,074 singleton pregnancies with GH and 199,980 normotensives. Generalized estimating equations estimated relative risks per interquartile-range increment for pollutants and high exposure (≥75th percentile) for toxics, after adjustment for major risk factors...
May 4, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28467079/allium-cepa-l-response-to-sodium-selenite-se-iv-studied-in-plant-roots-by-a-lc-ms-based-proteomic-approach
#5
Jakub Karasinski, Kazimierz Wrobel, Alma Rosa Corrales Escobosa, Anna Konopka, Ewa Bulska, Katarzyna Wrobel
Liquid chromatography-high-resolution mass spectrometry was used for the first time to investigate the impact of Se(IV) (10 mgSe L(-1) as sodium selenite) on Allium cepa L. root proteome. Using MaxQuant platform, more than 600 proteins were found; 42 were identified based on at least 2 razor + unique peptides, score > 25, and were found to be differentially expressed in the exposed versus control roots with t-test difference > ±0.70 (p < 0.05, Perseus). Se(IV) caused growth inhibition and the decrease of total RNA in roots...
May 8, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28463751/influence-of-physicochemical-characteristics-and-high-pressure-processing-on-the-volatile-fraction-of-iberian-dry-cured-ham
#6
Nerea Martínez-Onandi, Ana Rivas-Cañedo, Marta Ávila, Sonia Garde, Manuel Nuñez, Antonia Picon
The volatile fraction of 30 Iberian dry-cured hams of different physicochemical characteristics and the effect of high pressure processing (HPP) at 600MPa on volatile compounds were investigated. According to the analysis of variance carried out on the levels of 122 volatile compounds, intramuscular fat content influenced the levels of 8 benzene compounds, 5 carboxylic acids, 2 ketones, 2 furanones, 1 alcohol, 1 aldehyde and 1 sulfur compound, salt concentration influenced the levels of 1 aldehyde and 1 ketone, salt-in-lean ratio had no effect on volatile compounds, and water activity influenced the levels of 3 sulfur compounds, 1 alcohol and 1 aldehyde...
April 25, 2017: Meat Science
https://www.readbyqxmd.com/read/28458205/assessing-iron-and-aluminum-based-coagulants-for-odour-and-pathogen-reductions-in-sludge-digesters-and-enhanced-digestate-dewaterability
#7
Deniz Akgul, Timothy Abbott, Cigdem Eskicioglu
Anaerobic digestion (AD) is an effective way of recovering energy and nutrients from organic waste. However, several issues including the production of corrosive, highly odorous and toxic volatile sulfur compounds (VSCs) in digester biogas, and long digestion times to achieve sufficient pathogen reductions can limit its wider adoption. In this study, Kemira™ PIX-311 (ferric chloride), PAX XL-6 (aluminum chloride hydroxide sulfate), and PAX XL-19 (polyaluminum chlorohydrate) were added to the digester feeds to evaluate the effects on digester stability, organic removal, VSCs formation in digester headspace, pathogen removal and sludge dewaterability...
April 27, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28449999/the-effects-of-copper-fining-on-the-wine-content-in-sulfur-off-odors-and-on-their-evolution-during-accelerated-anoxic-storage
#8
Eduardo Vela, Purificación Hernández-Orte, Ernesto Franco-Luesma, Vicente Ferreira
Three different red wines with reductive character have been treated with two different doses of copper sulfate (0.06 and 0.5mg/L) and with a commercial copper-containing product at the recommended dose (0.6mg/L). Wines were in contact with copper one week, centrifuged and stored at 50°C in strict anoxia for 2weeks (up to 7 in one case). Brine-releasable (BR-) and free fractions of Volatile Sulfur Compounds were determined throughout the process. Relevant increases of BR-H2S suggest that those wines contained other H2S precursors non-detectable by the brine dilution method...
September 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28448151/methoxysulfinyl-radical-ch3oso-gas-phase-generation-photochemistry-and-oxidation
#9
Qifan Liu, Zhuang Wu, Jian Xu, Yan Lu, Hongmin Li, Xiaoqing Zeng
Methylsulfoxide radicals CH3SOx (x = 1-4) are key reactive sulfur species (RSS) in the atmospheric oxidation of volatile organic sulfur compounds (VOSCs). Through flash vacuum pyrolysis (FVP) of trifluoromethanesulfinic acid methyl ester CF3S(O)OCH3 at 1000 K, the methoxysulfinyl radical CH3OSO has been generated in the gas phase and subsequently characterized in cryogenic N2, Ar, and Ne matrices by IR spectroscopy. Upon 266 nm laser irradiation, CH3OSO efficiently isomerizes to the less stable methylsulfonyl radical CH3SO2 in matrices without noticeable decomposition...
May 4, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28442132/gas-chromatography-with-diode-array-detection-in-series-with-flame-ionisation-detection
#10
Ronda Gras, Jim Luong, Robert A Shellie
We introduce a gas chromatography detection approach that uses diode array detection operated in series with flame ionisation detection and demonstrate the utility of the detection approach for determination of volatile organic compounds. Diode array detection brings ultraviolet - visible spectroscopy (over a range of 190-640nm) onto the capillary gas chromatography time-scale, where average peak widths of analytes are on the order of 3-5s. The non-destructive nature of the diode array detector affords serially-coupled flame ionisation detection...
April 12, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28436828/sensory-profile-and-volatile-aroma-composition-of-reduced-alcohol-merlot-wines-fermented-with-metschnikowia-pulcherrima-and-saccharomyces-uvarum
#11
C Varela, A Barker, T Tran, A Borneman, C Curtin
Strategies for production of wines containing lower alcohol concentrations are in strong demand, for reasons of quality, health, and taxation. Development and application of wine yeasts that are less efficient at transforming grape sugars into ethanol has the potential to allow winemakers the freedom to make lower alcohol wines from grapes harvested at optimal ripeness, without the need for post-fermentation processes aimed at removing ethanol. We have recently shown that two non-conventional wine yeast species Metschnikowia pulcherrima and Saccharomyces uvarum were both able to produce wine with reduced alcohol concentration...
April 12, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28403513/a-new-negative-and-positive-gas-ion-source-for-isotope-ratio-mass-spectrometry
#12
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
#13
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
#14
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
#15
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)...
October 1, 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
#16
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
#17
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
#18
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
#19
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...
May 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
#20
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
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