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Volatile sulfur compounds

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https://www.readbyqxmd.com/read/29052557/determination-of-volatile-organic-compounds-in-exhaled-breath-of-heart-failure-patients-by-needle-trap-micro-extraction-coupled-with-gas-chromatography-tandem-mass-spectrometry
#1
Denise Biagini, Tommaso Lomonaco, Silvia Ghimenti, Francesca Giuseppa Bellagambi, Massimo Onor, Maria Chiara Scali, Valentina Barletta, Mario Marzilli, Pietro Salvo, Maria Giovanna Trivella, Roger Fuoco, Fabio Di Francesco
The analytical performances of needle trap micro-extraction (NTME) coupled with gas chromatography tandem mass spectrometry were evaluated by analyzing a mixture of twenty-two representative breath VOCs belonging to different chemical classes (i.e. hydrocarbons, ketones, aldehydes, aromatics and sulfurs). NTME is an emerging technique that guarantees detection limits in pptv range by pre-concentrating low volumes of sample, and it is particularly suitable for breath analysis. For most VOCs, detection limits between 20 and 500 pptv were obtained by pre-concentrating 25 mL of a humidified standard gas mixture at a flow rate of 15 mL/min...
October 20, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/29030669/sol-gel-based-spme-fiber-as-a-reliable-sampling-technique-for-studying-biogenic-volatile-organic-compounds-released-from-clostridium-tetani
#2
Masoud Ghader, Nader Shokoufi, Ali Es-Haghi, Kazem Kargosha
A novel and efficient headspace solid-phase microextraction (HS-SPME) method, followed by gas chromatography mass spectrometry (GC-MS), was developed to study volatile organic compounds (VOCs) emerging from microorganisms. Two homemade SPME fibers, a semi-polar poly (dimethylsiloxane) (PDMS) fiber, and a polar polyethylene glycol (PEG) fiber, along with two commercial fibers (PDMS and PDMS/DVB) were used to collect VOCs emerging from Clostridium tetani which was cultured in different media. The adsorbed VOCs were desorbed and identified, in vitro, using GC-MS...
October 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28991254/the-draft-genome-of-tropical-fruit-durian-durio-zibethinus
#3
Bin Tean Teh, Kevin Lim, Chern Han Yong, Cedric Chuan Young Ng, Sushma Ramesh Rao, Vikneswari Rajasegaran, Weng Khong Lim, Choon Kiat Ong, Ki Chan, Vincent Kin Yuen Cheng, Poh Sheng Soh, Sanjay Swarup, Steven G Rozen, Niranjan Nagarajan, Patrick Tan
Durian (Durio zibethinus) is a Southeast Asian tropical plant known for its hefty, spine-covered fruit and sulfury and onion-like odor. Here we present a draft genome assembly of D. zibethinus, representing the third plant genus in the Malvales order and first in the Helicteroideae subfamily to be sequenced. Single-molecule sequencing and chromosome contact maps enabled assembly of the highly heterozygous durian genome at chromosome-scale resolution. Transcriptomic analysis showed upregulation of sulfur-, ethylene-, and lipid-related pathways in durian fruits...
October 9, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28987726/inhibition-of-malodorous-gas-formation-by-oral-bacteria-with-cetylpyridinium-and-zinc-chloride
#4
Jeong Hyun Kang, Dae Jeong Kim, Bong Kyu Choi, Ji Woon Park
OBJECTIVE: The antimicrobial efficacy of zinc- (ZnCl2) and cetylpyridinium-chloride (CPC) and their inhibition capacity on volatile sulfur compound (VSC) production by oral bacterial strains were investigated. DESIGN: Minimum inhibitory concentrations (MIC) and growth curves were determined for ZnCl2, CPC, and CPC with ZnCl2 solutions against eight oral microorganisms (Aggregatibacter actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas gingivalis, Prevotella intermedia, Treponema denticola, Tannerella forsythia, Staphylococcus aureus and Streptococcus mutans) known to be involved in the pathophysiology of both halitosis and periodontal disease...
September 28, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28974794/triticale-crisp-bread-enriched-with-selected-bioactive-additives-volatile-profile-physical-characteristics-sensory-and-nutritional-properties
#5
Agnieszka Makowska, Małgorzata Majcher, Sylwia Mildner-Szkudlarz, Anna Jedrusek-Golinska, Krzysztof Przygoński
The effect of selected plant additives (couch grass, artichoke, kale, nettle, ground buckwheat husks, broad beans, fenugreek seeds, and extracts of yellow tea and mulberry leaf) on the volatile compounds, color, texture, sensory attributes, polyphenols, and antioxidant properties of triticale crisp bread was studied. The volatile profile of control bread was dominated by lipid oxidation products with hexanal and (E)-2-nonenal predominant. The additives strongly modified the volatile profile of the extruded crisp bread...
September 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28960073/elusive-chemistry-of-hydrogen-sulfide-and-mercaptans-in-wine
#6
Vicente Ferreira, Ernesto Franco-Luesma, Eduardo Vela, Ricardo López, Purificación Hernández-Orte
This paper summarizes, discusses, and complements recent findings about the fate of H2S and methanethiol (MeSH) during wine storage. Analytical assays to determine free volatile sulfur compounds (VSCs) and brine-releasable (BR-) VSCs in combination with accelerated reductive (AR) aging and micro-oxygenation (MOX) assays allow characterizing the different categories of species able to produce H2S and MeSH and the processes of interconversion. Each wine seems to contain a specific total amount of H2S and MeSH distributed into free, metal-complexed, and oxidized forms (di and polysulfides) interconnected through reversible redox equilibria whose external expression is wine redox potential...
October 9, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28951151/the-rdf-srf-torrefaction-an-effect-of-temperature-on-characterization-of-the-product-carbonized-refuse-derived-fuel
#7
Andrzej Białowiec, Jakub Pulka, Paweł Stępień, Piotr Manczarski, Janusz Gołaszewski
The influence of Refuse Derived Fuel (RDF)/Solid Recovery Fuel (SRF) torrefaction temperature on product characteristic was investigated. RDF/SRF thermal treatment experiment was conducted with 1-h residence time, under given temperatures: 200, 220, 240, 260, 280 and 300°C. Sawdust was used as reference material. The following parameters of torrefaction char from sawdust and Carbonized Refuse Derived Fuel (CRDF) from RDF/SRF were measured: moisture, calorific value, ash content, volatile compounds and sulfur content...
September 23, 2017: Waste Management
https://www.readbyqxmd.com/read/28946345/prediction-of-key-aroma-development-in-coffees-roasted-to-different-degrees-by-colorimetric-sensor-array
#8
Su-Yeon Kim, Jung-A Ko, Bo-Sik Kang, Hyun-Jin Park
We developed a colorimetric sensor array (CSA) that is sensitive to highly contributory volatile compounds of coffee aroma for discrimination of coffee samples roasted to different roast degrees. Strecker aldehydes and α-diketones were significantly higher for the medium roast than the other roast degrees. The development of several sulfur compounds was pronounced in the medium-dark and dark roasts, except for dimethyl sulfide, which was only detected in the light roast. The CSA method coupled with principal component analysis or hierarchical cluster analysis successfully distinguished the roasted coffee samples according to roast degree...
February 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28946244/aroma-characterization-of-five-microalgae-species-using-solid-phase-microextraction-and-gas-chromatography-mass-spectrometry-olfactometry
#9
Müge Isleten Hosoglu
In this study, aroma compounds produced by three marine microalgae species (Crypthecodinium cohnii, Schizochytrium limacinum and Tetraselmis chuii) and two fresh water microalgae (Chlorella vulgaris and Chlorella protothecoides) important for nutritional applications were identified by means of solid-phase microextraction followed by gas chromatography-mass spectrometry (GC-MS), GC-olfactometry (GCO) and a sensory panel. Principal components analysis (PCA) was applied to the instrumental and sensory analysis data to visualize differences between the samples in terms of descriptive attributes and volatile compounds...
February 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28887468/the-network-of-plants-volatile-organic-compounds
#10
Gianna Vivaldo, Elisa Masi, Cosimo Taiti, Guido Caldarelli, Stefano Mancuso
Plants emission of Volatile Organic Compounds (VOCs) is involved in a wide class of ecological functions, as VOCs play a crucial role in plants interactions with biotic and abiotic factors. Accordingly, they vary widely across species and underpin differences in ecological strategy. In this paper, VOCs spontaneously emitted by 109 plant species (belonging to 56 different families) have been qualitatively and quantitatively analysed in order to provide an alternative classification of plants species. In particular, by using bipartite networks methodology from Complex Network Theory, and through the application of community detection algorithms, we show that is possible to classify species according to chemical classes such as terpenes and sulfur compounds...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28879507/methanethiol-generation-potential-from-anaerobic-degradation-of-municipal-solid-waste-in-landfills
#11
Min Chen, Xing-Zhi Yao, Ruo-Chan Ma, Qing-Chuan Song, Yuyang Long, Ruo He
Volatile sulfur compounds are the main odorants at landfills. In this study, methanethiol (CH3SH) was chosen as a typical volatile organic sulfur compound, and its generation potential was investigated during the anaerobic degradation of the organic fractions of municipal solid waste (MSW) including rice, flour food, vegetable, fish and pork, paper, cellulose textile, and yard wastes. Among the experimental wastes, gas generation was the highest in the fish and pork waste with a high CH3SH concentration of up to 2...
October 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28876901/flexible-graphene-based-wearable-gas-and-chemical-sensors
#12
Eric Singh, M Meyyappan, Hari Singh Nalwa
Wearable electronics is expected to be one of the most active research areas in the next decade; therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, lightweight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons...
October 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28875948/the-tongue-microbiome-in-healthy-subjects-and-patients-with-intra-oral-halitosis
#13
Kavitha Seerangaiyan, Arie Jan van Winkelhoff, Hermie J M Harmsen, John W A Rossen, Edwin G Winkel
Intra-oral halitosis (IOH) is an unpleasant odor emanating from the oral cavity. It is thought that the microbiota of the dorsal tongue coating plays a crucial role in this condition. The aim of the study was to investigate the composition of the tongue microbiome in subjects with and without IOH. A total of 26 subjects, 16 IOH patients and 10 healthy subjects were recruited based on their organoleptic score and volatile sulfur compound (VSC) measurements. The composition of the tongue microbiome was studied using the 16s amplicon sequencing of the V3-V4 hyper variable region with an Illumina MiSeq...
September 6, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28865386/response-of-rhizobium-to-cd-exposure-a-volatile-perspective
#14
Paulo Cardoso, Magda Santos, Rosa Freitas, Sílvia M Rocha, Etelvina Figueira
The volatile metabolome of Rhizobium sp. strain E20-8 exposed to three concentrations of cadmium (2.5, 5.0 and 7.5 μM) was screened using comprehensive two-dimensional gas chromatography coupled to time of flight mass spectrometry (GC × GC-ToFMS), combined with headspace solid phase microextraction (HS-SPME). Cd exposure induced a global increase in the concentration of volatile organic compounds (VOCs) both intra and extracellularly. Peak areas of several linear alkanes, ketones, aldehydes, alcohols, terpenic and volatile sulfur compounds, and one ester (ethyl acetate), were especially increased when compared with the control condition (no Cd)...
August 30, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28830094/physiology-ecology-and-industrial-applications-of-aroma-formation-in-yeast
#15
Maria C Dzialo, Rahel Park, Jan Steensels, Bart Lievens, Kevin J Verstrepen
Yeast cells are often employed in industrial fermentation processes for their ability to efficiently convert relatively high concentrations of sugars into ethanol and carbon dioxide. Additionally, fermenting yeast cells produce a wide range of other compounds, including various higher alcohols, carbonyl compounds, phenolic compounds, fatty acid derivatives and sulfur compounds. Interestingly, many of these secondary metabolites are volatile and have pungent aromas that are often vital for product quality. In this review, we summarize the different biochemical pathways underlying aroma production in yeast as well as the relevance of these compounds for industrial applications and the factors that influence their production during fermentation...
August 1, 2017: FEMS Microbiology Reviews
https://www.readbyqxmd.com/read/28804491/phylloremediation-of-air-pollutants-exploiting-the-potential-of-plant-leaves-and-leaf-associated-microbes
#16
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
#17
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
#18
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
#19
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
#20
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
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