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Volatile sulfur compounds

Zhangliang Han, Fei Qi, Hui Wang, Baoxian Liu, Xiue Shen, Cheng Song, Zhiyuan Bao, Xufeng Zhao, Yangjie Xu, Dezhi Sun
The emission of volatile sulfur compounds (VSCs) causing strong odors is a major problem in municipal sewage sludge composting plants (MSSACPs). Improving the knowledge on characteristics of VSCs emission in MSAACPs is of particular significance to elimate odors, but the studies conducted on-site to identify them are scarce. To this purpose, characteristics of VSCs emission were studied on-site from a MSSACP during different ambient temperatures corresponding with seasonal variations. Results reveal that (1) the total emission of VSCs which included methyl disulfide (DMDS), methyl sulfide (DMS), carbon disulfide, methyl mercaptan, and hydrogen sulfide (H2 S) was 561...
June 12, 2018: Waste Management
Víctor J Carrión, Viviane Cordovez, Olaf Tyc, Desalegn W Etalo, Irene de Bruijn, Victor C L de Jager, Marnix H Medema, Leo Eberl, Jos M Raaijmakers
Disease-suppressive soils are ecosystems in which plants suffer less from root infections due to the activities of specific microbial consortia. The characteristics of soils suppressive to specific fungal root pathogens are comparable to those of adaptive immunity in animals, as reported by Raaijmakers and Mazzola (Science 352:1392-3, 2016), but the mechanisms and microbial species involved in the soil suppressiveness are largely unknown. Previous taxonomic and metatranscriptome analyses of a soil suppressive to the fungal root pathogen Rhizoctonia solani revealed that members of the Burkholderiaceae family were more abundant and more active in suppressive than in non-suppressive soils...
June 13, 2018: ISME Journal
Jing Yuan, Yun Li, Hongyu Zhang, Difang Zhang, David Chadwick, Guoxue Li, Guoying Wang, Menghao Chi, Fan Yang
The effects of adding a bulking agent on the performance and odor emissions (ammonia and eight sulfur-containing odorous compounds) when biodrying kitchen waste were investigated. Three treatments were considered: the addition of either cornstalks (CS) or wood peat (WP) to kitchen waste as a bulking agent before biodrying, and a control treatment (CK). The water-removal rates for CK, CS, and WP treatments were 0.35, 0.56, and 0.43kg/kg, respectively. Addition of bulking agents to kitchen waste produced less leachate, higher moisture-removal rates, and lower consumption of volatile solids...
May 2018: Journal of Environmental Sciences (China)
Patricia Oliveira de Lima, Bruno Dias Nani, Barbara Almeida, Fernanda Klein Marcondes, Francisco Carlos Groppo, Antonio Bento Alves de Moraes, Michelle Franz-Montan, Karina Cogo-Müller
OBJECTIVE: To determine whether stress-related substances and sex hormones influence the growth and in vitro production of volatile sulfur compounds (VSCs) by Solobacterium moorei and Fusobacterium nucleatum. MATERIALS AND METHODS: Bacteria growth and VSCs production were evaluated in the presence of alpha-amylase, beta-defensin-2, mucin, estradiol, and progesterone. Growth was evaluated by colony counting, and the production of the VSCs hydrogen sulfide (H2 S) and methyl mercaptan (CH3 SH) was measured using the Oral Chroma™ instrument...
May 15, 2018: Oral Diseases
Damla Aksit Bicak
Background: Halitosis, in other words, oral malodor is an important multifactorial health problem affecting the psychological and social life of individuals and is the most common reason for referral to dentists after dental caries and periodontal diseases. Objective: The objective of this review was to present and discuss conventional and recently introduced information about the types, causes, detection and treatment methods of halitosis. Methods: An expanded literature review was conducted which targeted all articles published in peer-reviewed journals relating to the topic of halitosis...
2018: Open Dentistry Journal
Ruth Fisher, Ari Shammay, Juan Pablo Alvarez-Gaitan, Richard M Stuetz
The composition of wastewater in sewer catchments is known to affect the performance of wastewater treatment plants (WWTPs). However, there is limited knowledge as to how catchment characteristics, such as types of catchment industries, impact odour emissions from downstream sludge processing and biosolids management. Odorous emissions from biosolids processing at WWTPs can represent a significant community impact when the local population is exposed to odours. The main odorants emitted from biosolids are volatile sulfur compounds (VSCs), however, volatile organic compounds (VOCs) in emissions may also be perceptable after the removal of VSCs in odour abatement systems...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Huai-Xiang Tian, Ya-Jing Zhang, Chen Chen, Lan Qin, Li-Zhong Xiao, Yu-Gang Fei, Hai-Yan Yu
BACKGROUND: Chicken seasoning is a widely consumed palatable seasoning made by chicken meat. Quality especially the sensory quality may determine the consumer choice of food. For the same bag of chicken seasoning will be stored to use by the consumers over a long period of time, estimation of its sensory quality is particularly important. However, the sensory quality defects of chicken seasoning during storage remains unknown. This study evaluated flavor changes in chicken seasoning during storage using sensory evaluation and gas chromatography-mass spectrometry (GC-MS)...
May 13, 2018: Journal of the Science of Food and Agriculture
Huilin Liu, Baoguo Sun
Baijiu, otherwise known as the national liquor of China, is a well-known distilled spirit that has been produced for over 2,000 years. Baijiu is a clear and transparent fermented alcoholic beverage containing more than 1,870 volatile compounds, including esters, alcohols, aromatics, ketones, heterocycles, nitrogenous compounds, acids, aldehydes, terpenes, sulfur compounds, acetals, and lactones. This perspective describes the Baijiu production process, summarizes recent progress in the development and study of Baijiu flavor chemistry, discusses the effect of fermentation processing on Baijiu flavor, and presents novel development trends in the Baijiu industry in the dual directions of flavor and health...
May 11, 2018: Journal of Agricultural and Food Chemistry
Daniel Armeanu, Georgeta Vintilă, Jean Vasile Andrei, Ştefan Cristian Gherghina, Mihaela Cristina Drăgoi, Cristian Teodor
This study examines the Environmental Kuznets Curve hypothesis (EKC), considering the primary energy consumption among other country-specific variables, for a panel of the EU-28 countries during the period 1990-2014. By estimating pooled OLS regressions with Driscoll-Kraay standard errors in order to account for cross-sectional dependence, the results confirm the EKC hypothesis in the case of emissions of sulfur oxides and emissions of non-methane volatile organic compounds. In addition to pooled estimations, the output of fixed-effects regressions with Driscoll-Kraay standard errors support the EKC hypothesis for greenhouse gas emissions, greenhouse gas emissions intensity of energy consumption, emissions of nitrogen oxides, emissions of non-methane volatile organic compounds and emissions of ammonia...
2018: PloS One
Kyu Young Choi, Bum Sang Lee, Jin Hwan Kim, Jung Jun Kim, Young Jang, Jong Wook Choi, Dong Jin Lee
Objectives: To study the volatile sulfur compound (VSC) concentration profile in chronic tonsillitis patients before and after tonsillectomy, and to evaluate the difference between adult and pediatric (children and adolescents) patients. Methods: Thirty adult patients (older than 20 years old) and 30 pediatric patients (younger than 20 years old) who were assigned to get tonsillectomy due to chronic tonsillitis were enrolled in this prospective nonrandomized clinical study...
May 4, 2018: Clinical and Experimental Otorhinolaryngology
Yifeng Xue, Linglong Cheng, Xi Chen, Xiaoman Zhai, Wei Wang, Wenjie Zhang, Yan Bai, Hezhong Tian, Lei Nie, Shihao Zhang, Tong Wei
The process of corpse cremation generates numerous harmful air pollutants, including particulate matter (PM), sulfur dioxide (SO2), nitrogen oxides (NOx), volatile organic compounds (VOCs), and heavy metals. These pollutants could have severe effects on the surrounding environment and human health. Currently, the awareness of the emission levels of harmful air pollutants from cremators and their emission characteristics is insufficient. In this study, we obtained the emission characteristics of flue gas from cremators in Beijing and determined the localized emission factors and emission levels of harmful air pollutants based on actual monitoring data from nine typical cremators...
2018: PloS One
Travis McLennon, Chun-Yip Hon
Exposure of ice resurfacer operators to indoor air contaminants was measured in six indoor ice arenas. A standardized questionnaire on technical and operational features was employed and indoor airborne concentrations of carbon monoxide (CO), carbon dioxide (CO2 ), nitric oxide (NO), nitrogen dioxide (NO2 ), sulfur dioxide (SO2 ), and total volatile organic compounds (VOCs) were measured. Air samples were collected using a range of direct reading instruments attached to the driver's seat of the resurfacer. The range of mean exposure concentrations via positional sampling (i...
July 2017: International Journal of Occupational and Environmental Health
Hamid Omidvarborna, Mahad Baawain, Abdullah Al-Mamun
With rapid urbanization and economic growth, many developing countries have faced a greater share of air pollutants in recent years. An increasing number of exposure studies on air pollutants have been reported lately. However, due to lack of strict regulations and monitoring stations among developing countries, such as Gulf Cooperation Council (GCC) countries, limited air pollution and exposure assessment studies have been conducted in this region. Thus, the objective of this critical review was to identify the major sources of air pollutants in the region with hot and arid/semiarid climate for the main categories contributing to specific pollutants...
April 27, 2018: Science of the Total Environment
Mireille Andriamihaja, Annaïg Lan, Martin Beaumont, Marta Grauso, Martin Gotteland, Edgar Pastene, Maria Jose Cires, Catalina Carrasco-Pozo, Daniel Tomé, François Blachier
Hydrogen sulfide (H2 S), a metabolic end product synthesized by the microbiota from L-cysteine, has been shown to act at low micromolar concentration as a mineral oxidative substrate in colonocytes while acting as an inhibitor of oxygen consumption at higher luminal concentrations (65 µM and above). From the previous works showing that polyphenols can bind volatile sulfur compounds, we hypothesized that different dietary proanthocyanidin-containing polyphenol (PACs) plant extracts might modulate the inhibitory effect of H2 S on colonocyte respiration...
April 27, 2018: Amino Acids
Patrick Campbell, Yang Zhang, Fang Yan, Zifeng Lu, David Streets
In Part II of this work we present the results of the downscaled offline Weather Research and Forecasting/Community Multiscale Air Quality (WRF/CMAQ) model, included in the "Technology Driver Model" (TDM) approach to future U.S. air quality projections (2046-2050) compared to a current-year period (2001-2005), and the interplay between future emission and climate changes. By 2046-2050, there are widespread decreases in future concentrations of carbon monoxide (CO), nitrogen oxides (NOx  = NO + NO2 ), volatile organic compounds (VOCs), ammonia (NH3 ), sulfur dioxide (SO2 ), and particulate matter with an aerodynamic diameter ≤ 2...
July 2018: Environmental Pollution
Patrick Campbell, Yang Zhang, Fang Yan, Zifeng Lu, David Streets
Emissions from the transportation sector are rapidly changing worldwide; however, the interplay of such emission changes in the face of climate change are not as well understood. This two-part study examines the impact of projected emissions from the U.S. transportation sector (Part I) on ambient air quality in the face of climate change (Part II). In Part I of this study, we describe the methodology and results of a novel Technology Driver Model (see graphical abstract) that includes 1) transportation emission projections (including on-road vehicles, non-road engines, aircraft, rail, and ship) derived from a dynamic technology model that accounts for various technology and policy options under an IPCC emission scenario, and 2) the configuration/evaluation of a dynamically downscaled Weather Research and Forecasting/Community Multiscale Air Quality modeling system...
July 2018: Environmental Pollution
Brian J Kerr, Steven L Trabue, Mark B van Weelden, Daniel S Andersen, Laura M Pepple
An experiment was conducted to determine the effect of feeding finishing pigs a corn-soybean (CSBM) diet or a CSBM diet supplemented with 30% dried distillers grains with solubles (DDGS), in combination with or without a growth-promoting ionophore (0 or 30 mg narasin/kg of diet), has on manure composition, microbial ecology, and gas emissions. Two separate groups of 24 gilts (initial BW = 145.1 kg, SD = 7.8 kg) were allotted to individual metabolism crates that allowed for total but separate collection of feces and urine during the 48-d collection period...
April 14, 2018: Journal of Animal Science
Jia-Wei Yan, Zhao-Jun Ban, Hong-Yan Lu, Dong Li, Elena Poverenov, Zi-Sheng Luo, Li Li
Aroma significantly contributes to flavor, which directly affects the commercial quality of strawberries. The strawberry aroma is complex as many kinds of volatile compounds are found in strawberries. In this review, we describe the current knowledge of the constituents and of the biosynthesis of strawberry volatile compounds, and the effect of postharvest treatments on aroma profiles. The characteristic strawberry volatile compounds consist of furanones, such as 2,5-dimethyl-4-hydroxy-3(2H)-furanone and 4-methoxy-2,5-dimethyl-3(2H)-furanone; esters, including ethyl butanoate, ethyl hexanoate, methyl butanoate, and methyl hexanoate; sulfur compounds such as methanethiol, and terpenoids including linalool and nerolidol...
March 30, 2018: Journal of the Science of Food and Agriculture
Yonathan Asikin, Kusumiyati, Eizo Taira, Koji Wada
Petai seeds are one of the well-known strong-smelling foods of the Southeast Asian region that have been harvested and commercially offered in different ripening forms. The current study focused on alterations in the size, color, sugar composition, and volatile flavor properties of petai seeds in the four ripening stages (unripe, mid ripe, ripe, and over-ripe). The ripening process was mainly indicated by the increase in size and weight as seed color turned paler and less greenish. The total sugar content gradually increased during ripening, and then elevated from 1...
April 2018: Food Research International
Luke Bell, Omobolanle O Oloyede, Stella Lignou, Carol Wagstaff, Lisa Methven
Brassicaceae plants are renowned for their taste, aroma and trigeminal characteristics; predominantly bitter taste, sulfurous aroma, and pungency. Compounds responsible for these sensations include the glucosinolates (GSLs) and their hydrolysis products, particularly isothiocyanates (ITCs), but also sulfur-containing volatile compounds. This article reviews the relative importance of taste and flavor perceptions resulting from such compounds; collating evidence from papers where findings are based on sensory analytical correlations, and those that have extracted specific compounds prior to sensory evaluation...
March 26, 2018: Molecular Nutrition & Food Research
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