keyword
MENU ▼
Read by QxMD icon Read
search

Volatile sulfur compounds

keyword
https://www.readbyqxmd.com/read/28804491/phylloremediation-of-air-pollutants-exploiting-the-potential-of-plant-leaves-and-leaf-associated-microbes
#1
REVIEW
Xiangying Wei, Shiheng Lyu, Ying Yu, Zonghua Wang, Hong Liu, Dongming Pan, Jianjun Chen
Air pollution is air contaminated by anthropogenic or naturally occurring substances in high concentrations for a prolonged time, resulting in adverse effects on human comfort and health as well as on ecosystems. Major air pollutants include particulate matters (PMs), ground-level ozone (O3), sulfur dioxide (SO2), nitrogen dioxides (NO2), and volatile organic compounds (VOCs). During the last three decades, air has become increasingly polluted in countries like China and India due to rapid economic growth accompanied by increased energy consumption...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28802017/volatile-composition-and-sensory-profile-of-shiitake-mushrooms-as-affected-by-drying-method
#2
Joanna Politowicz, Krzysztof Lech, Leontina Lipan, Adam Figiel, Ángel A Carbonell-Barrachina
BACKGROUND: One of the best preservation method for long-term storage is drying. In this work, the influence of different drying methods on aroma and sensory profile of shiitake mushroom was evaluated. The drying methods tested were: convective drying (CD), freeze-drying (FD), vacuum-microwave drying (VMD), and a combination of convective pre-drying and vacuum-microwave finish-drying (CPD-VMFD). RESULTS: The volatile composition of fresh and dried shiitake mushrooms was analyzed by SPME, GC-MS and GC-FID, and showed the presence of 71 volatile compounds, most of them present in all dried samples but with quantitative variation...
August 12, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28783776/odorous-volatile-organic-compounds-escherichia-coli-and-nutrient-concentrations-when-kiln-dried-pine-chips-and-corn-stover-bedding-are-used-in-beef-bedded-manure-packs
#3
Mindy J Spiehs, Elaine D Berry, James E Wells, David B Parker, Tami M Brown-Brandl
Pine ( spp.) bedding has been shown to lower the concentration of odorous volatile organic compounds (VOCs) and pathogenic bacteria compared with corn ( L.) stover bedding, but availability and cost limit the use of pine bedding in cattle confinement facilities. The objectives of this study were to determine if the addition of pine wood chips to laboratory-scaled bedded packs containing corn stover (i) reduced odorous VOC emissions; (ii) reduced total ; and (iii) changed the nutrient composition of the resulting manure-bedded packs...
July 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28740301/effect-of-modified-atmosphere-packaging-and-temperature-abuse-on-flavor-related-volatile-compounds-of-rocket-leaves-diplotaxis-tenuifolia-l
#4
Leonarda Mastrandrea, Maria Luisa Amodio, Sandra Pati, Giancarlo Colelli
The effect of storage conditions on flavor-related volatile composition of wild rocket (Diplotaxis tenuifolia) was investigated on Modified Atmosphere packed (MAP) leaves stored under isothermal and non-isothermal conditions. In a first experiment the effect of MAP was compared to the storage in air at 5 °C; a second experiment aimed to study the effect of non isothermal conditions, with two temperature abuses (at 13 °C for 24 h) during a 5 °C. Twenty-four volatiles were detected, including C6, C5, isothiocyanate, lipid-derived and sulfur compounds...
July 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28736050/effects-of-aeration-and-leachate-recirculation-on-methyl-mercaptan-emissions-from-landfill
#5
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/28698649/characterizing-the-scent-and-chemical-composition-of-panthera-leo-marking-fluid-using-solid-phase-microextraction-and-multidimensional-gas-chromatography-mass-spectrometry-olfactometry
#6
Simone B Soso, Jacek A Koziel
Lions (Panthera leo) use chemical signaling to indicate health, reproductive status, and territorial ownership. To date, no study has reported on both scent and composition of marking fluid (MF) from P. leo. The objectives of this study were to: 1) develop a novel method for simultaneous chemical and scent identification of lion MF in its totality (urine + MF), 2) identify characteristic odorants responsible for the overall scent of MF as perceived by human panelists, and 3) compare the existing library of known odorous compounds characterized as eliciting behaviors in animals in order to understand potential functionality in lion behavior...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687647/the-deep-sea-bacterium-shewanella-piezotolerans-wp3-has-two-dmso-reductases-in-distinct-subcellular-locations
#7
Lei Xiong, Huahua Jian, Xiang Xiao
Dimethyl sulfoxide (DMSO) acts as a substantial sink for dimethyl sulfide (DMS) in deep waters and is therefore considered a potential electron acceptor supporting abyssal ecosystems. Shewanella piezotolerans WP3 was isolated from west Pacific deep-sea sediments, and two functional DMSO respiratory subsystems are essential for maximum growth of WP3 under in situ conditions (4°C/20 MPa). However, the relationship between these two subsystems and the electron transport pathway underlying DMSO reduction by WP3 remain unknown...
July 7, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28674708/the-association-of-periodontopathic-bacteria-levels-%C3%A2-in-saliva-and-tongue-coating-with-oral-malodor-in-periodontitis-patients
#8
Hironobu Takeuchi, Miho Machigashira, Naoshi Takeuchi, Toshiaki Nakamura, Kazuyuki Noguchi
PURPOSE: To elucidate the association oral malodor with the levels of periodontopathic bacteria in saliva and tongue coating of periodontitis patients with oral malodor. MATERIALS AND METHODS: In 25 periodontitis patients, the organoleptic test (OLT) was performed, the levels of volatile sulfur compounds (VSCs) were measured, tongue coating (TC) score was determined, and periodontal parameters and the proportions of Porphyromonas gingivalis, Aggregatibacter actinomycetemcomitans, Treponema denticola, Tannerella forsythia and Prevotella intermedia in the saliva and the tongue coating were evaluated...
2017: Oral Health & Preventive Dentistry
https://www.readbyqxmd.com/read/28651342/emissions-of-volatile-odorous-metabolites-by-clostridium-perfringens-in-vitro-study-using-two-broth-cultures
#9
Nishchal K Sharma, Chuck Keerqin, Shu-Biao Wu, Mingan Choct, Robert A Swick
An in vitro study was carried out to investigate the volatile odorous metabolites produced by necrotic enteritis inducing Clostridium perfringens (Cp) type A field strain (EHE-NE18) cultured in two broth media (thioglycollate broth, brain heart infusion broth) at three levels (0, 103 cfu/mL, 106 cfu/mL) using 2 × 3 factorial arrangement of treatments, with each replicated three times. The culture media with and without Cp was freshly prepared on the day of measurement and the culture headspace concentration of odorants was measured using selected ion-flow tube mass spectrometry (SIFT-MS)...
June 23, 2017: Poultry Science
https://www.readbyqxmd.com/read/28639032/case-study-microbial-ecology-and-forensics-of-chinese-drywall-elemental-sulfur-disproportionation-as-primary-generator-of-hydrogen-sulfide
#10
Francisco A Tomei Torres
Drywall manufactured in China released foul odors attributed to volatile sulfur compounds. These included hydrogen sulfide, methyl mercaptan, and sulfur dioxide. Given that calcium sulfate is the main component of drywall, one would suspect bacterial reduction of sulfate to sulfide as the primary culprit. However, when the forensics, i.e., the microbial and chemical signatures left in the drywall, are studied, the evidence suggests that, rather than dissimilatory sulfate reduction, disproportionation of elemental sulfur to hydrogen sulfide and sulfate was actually the primary cause of the malodors...
June 21, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28629219/thermally-induced-generation-of-desirable-aroma-active-compounds-from-the-glucosinolate-sinigrin
#11
Eva Ortner, Michael Granvogl
Glucosinolates are the most abundant secondary sulfur-containing plant metabolites in the plant family of Brassicaceae. These phytochemicals are well-known for their enzymatic degradation induced by the enzyme myrosinase, resulting in pungent odor impressions derived from their respective degradation products. However, up to now, only little attention has been paid to non-enzymatic thermal degradation and the release of additional aroma-active compounds. Thermal treatment is particularly important in the processing of Brassica vegetables, and thereby, glucosinolates as precursors can act as a natural source of odorants...
July 27, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28622437/detection-of-halitosis-in-breath-between-the-past-present-and-future
#12
M K Nakhleh, M Quatredeniers, H Haick
To develop a new generation of diagnostics for halitosis, replacing the subjective organoleptic assessment, a series of exhaled breath analyzers has been developed and assessed. All three devices rely on the assessment of exhaled volatile sulfuric compounds (VSCs), which are mainly generated in and emitted from the oral cavity, contributing to the malodor. Portable, on-site and easy to use, these devices have potential for non-invasive diagnosis of halitosis. However, global assessment of exhaled VSCs alone has two main drawbacks: (i) the absence of VSCs does not rule out halitosis; (ii) non-sulfuric volatile compounds that could be biomarkers of systemic diseases, found in up to 15% of halitosis cases, are neglected...
June 16, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28597472/aroma-volatile-profile-of-black-morel-morchella-importuna-grown-in-israel
#13
Zipora Tietel, Segula Masaphy
BACKGROUND: Headspace solid-phase microextraction (HS-SPME) method with gas-chromatography mass spectrometry (GC-MS) was used to profile the aroma volatiles of mature fruiting bodies of Morchella importuna grown in Israel. RESULTS: We tentatively identified 40 aroma compounds and seven unknown volatiles. The M. importuna aroma profile consisted of 14 aldehydes, 6 alcohols, 10 methyl esters, 4 heterocyclic/sulfur compounds, 10 carbohydrates and 3 other compounds-one acid, one ketone and one butyl ester...
June 9, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28553707/wafer-scale-synthesized-mos2-porous-silicon-nanostructures-for-efficient-and-selective-ethanol-sensing-at-room-temperature
#14
Priyanka Dwivedi, Samaresh Das, Saakshi Dhanekar
This paper presents the performance of a highly selective ethanol sensor based on MoS2-functionalized porous silicon (PSi). The uniqueness of the sensor includes its method of fabrication, wafer scalability, affinity for ethanol, and high sensitivity. MoS2 nanoflakes (NFs) were synthesized by sulfurization of oxidized radio-frequency (RF)-sputtered Mo thin films. The MoS2 NFs synthesis technique is superior in comparison to other methods, because it is chip-scalable and low in cost. Interdigitated electrodes (IDEs) were used to record resistive measurements from MoS2/PSi sensors in the presence of volatile organic compound (VOC) and moisture at room temperature...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28549212/synthesis-of-four-monoterpene-derived-organosulfates-and-their-quantification-in-atmospheric-aerosol-samples
#15
Yuchen Wang, Jingyun Ren, X H Hilda Huang, Rongbiao Tong, Jian Zhen Yu
Monoterpenes, a major class of biogenic volatile organic compounds, are known to produce oxidation products that further react with sulfate to form organosulfates. The accurate quantification of monoterpene-derived organosulfates (OSs) is necessary for quantifying this controllable aerosol source; however, it has been hampered by a lack of authentic standards. Here we report a unified synthesis strategy starting from the respective monoterpene through Upjohn dihydroxylation or Sharpless asymmetric dihydroxylation followed by monosulfation with the sulfur trioxide-pyridine complex...
June 8, 2017: Environmental Science & Technology
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
#16
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...
2017: Quintessence International
https://www.readbyqxmd.com/read/28494291/distribution-and-sensorial-relevance-of-volatile-organic-compounds-emitted-throughout-wastewater-biosolids-processing
#17
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...
December 1, 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
#18
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
#19
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
#20
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 17, 2017: Journal of Agricultural and Food Chemistry
keyword
keyword
68566
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"