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Volatile sulfur compounds

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https://www.readbyqxmd.com/read/29231015/-relationship-between-the-change-rules-of-volatile-organic-compounds-in-rat-muscle-and-postmortem-interval
#1
B B Liu, Z Y Xia, J Q Ma, P Li, P Lü, H M Zhou
OBJECTIVES: To explore the relationship between the change rules of volatile organic compounds (VOCs) in rat muscle and postmortem interval (PMI). METHODS: A total of 120 healthy rats were divided randomly into 12 groups (10 for each group). After the rats were sacrificed by cervical dislocation, the bodies were kept at (25±1) ℃. Rat muscle samples were separately obtained at 12 PMI points, including 0, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 d...
April 2017: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29216827/comparative-genomic-analysis-of-brevibacterium-strains-insights-into-key-genetic-determinants-involved-in-adaptation-to-the-cheese-habitat
#2
Nguyen-Phuong Pham, Séverine Layec, Eric Dugat-Bony, Marie Vidal, Françoise Irlinger, Christophe Monnet
BACKGROUND: Brevibacterium strains are widely used for the manufacturing of surface-ripened cheeses, contributing to the breakdown of lipids and proteins and producing volatile sulfur compounds and red-orange pigments. The objective of the present study was to perform comparative genomic analyses in order to better understand the mechanisms involved in their ability to grow on the cheese surface and the differences between the strains. RESULTS: The genomes of 23 Brevibacterium strains, including twelve strains isolated from cheeses, were compared for their gene repertoire involved in salt tolerance, iron acquisition, bacteriocin production and the ability to use the energy compounds present in cheeses...
December 7, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29197785/impact-of-gingivitis-treatment-for-diabetic-patients-on-quality-of-life-related-to-periodontal-objective-parameters-a-randomized-controlled-clinical-trial
#3
Sheila C Cortelli, Fernando O Costa, Antonio Gargioni-Filho, Davi R Aquino, Luis O M Cota, Alexandre P Scherma, Taís B Miranda, Jose R Cortelli
OBJECTIVES: Patients with diabetes have a poor oral health-related quality of life (OHRQoL). It is not clear if this situation could be changed with effective periodontal treatment. This study examined both patients with diabetes and systemically healthy individuals to discover the impact of a gingivitis treatment protocol on OHRQoL and its relation to objective periodontal parameters. DESIGN: After ultrasonic debridement, patients were randomly assigned to an essential-oils (EO) or placebo mouthwash group...
November 30, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29197439/halitosis-assessment-and-changes-in-volatile-sulfur-compounds-after-chewing-gum-a-study-performed-on-dentistry-students
#4
Mayra Schemel-Suárez, Eduardo Chimenos-Küstner, Albert Estrugo-Devesa, Enric Jané-Salas, José López-López
OBJECTIVE: The objective of this study is to estimate the prevalence of halitosis (with subjective and objective methods), evaluate the immediate effect of chewing gum on volatile sulfur compounds (VSCs), assess the perception of halitosis by dentistry students, and estimate the distribution of positive and negative frequencies, when comparing objective and subjective methods for the diagnosis of halitosis. METHODS: The study was performed on a sample of dentistry students attending the Faculty of Medicine and Health Sciences at the University of Barcelona...
December 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/29194970/headspace-solid-phase-microextraction-and-gas-chromatographic-analysis-of-low-molecular-weight-sulfur-volatiles-with-pulsed-flame-photometric-detection-and-quantification-by-a-stable-isotope-dilution-assay
#5
Sebastian Ullrich, Sylvia K Neef, Hans-Georg Schmarr
Low-molecular-weight volatile sulfur compounds such as thiols, sulfides, disulfides as well as thioacetates cause a sulfidic off-flavor in wines even at low concentration levels. The proposed analytical method for quantification of these compounds in wine is based on headspace solid-phase microextraction, followed by gas chromatographic analysis with sulfur-specific detection using a pulsed flame photometric detector. Robust quantification was achieved via a stable isotope dilution assay using commercial and synthesized deuterated isotopic standards...
November 30, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29189899/starter-cultures-as-biocontrol-strategy-to-prevent-brettanomyces-bruxellensis-proliferation-in-wine
#6
REVIEW
Carmen Berbegal, Giuseppe Spano, Mariagiovanna Fragasso, Francesco Grieco, Pasquale Russo, Vittorio Capozzi
Brettanomyces bruxellensis is a common and significant wine spoilage microorganism. B. bruxellensis strains generally detain the molecular basis to produce compounds that are detrimental for the organoleptic quality of the wine, including some classes of volatile phenols that derive from the sequential bioconversion of specific hydroxycinnamic acids such as ferulate and p-coumarate. Although B. bruxellensis can be detected at any stage of the winemaking process, it is typically isolated at the end of the alcoholic fermentation (AF), before the staring of the spontaneous malolactic fermentation (MLF) or during barrel aging...
November 30, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29182074/enclosure-design-for-flock-level-chronic-exposure-of-birds-to-air-contaminant-mixtures
#7
Michelle A North, David W Kinniburgh, Judit E G Smits
The objective of this study was to design an enclosure suitable for studying the ecotoxicological effects of vehicle emissions on groups of wild birds without compromising welfare. Two, adjacent enclosures sheltered from sunlight, wind and rain, were bird-proofed and wrapped with thick polyethylene sheeting. Emissions were directed into the treatment enclosure from the exhaust of a light-duty gasoline truck, using flexible, heat-proof pipe, with joins sealed to prevent leakage. During active exposure, the engine was idled for five hours per day, six days per week for four weeks...
November 28, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/29178810/nanoscale-agglomerate-mediated-heterogeneous-nucleation
#8
Hyeongyun Cha, Alex Wu, Moon-Kyung Kim, Kosuke Saigusa, Aihua Liu, Nenad Miljkovic
Water vapor condensation on hydrophobic surfaces has received much attention due to its ability to rapidly shed water droplets and enhance heat transfer, anti-icing, water harvesting, energy harvesting, and self-cleaning performance. However, the mechanism of heterogeneous nucleation on hydrophobic surfaces remains poorly understood and is attributed to defects in the hydrophobic coating exposing the high surface energy substrate. Here, we observe the formation of high surface energy nanoscale agglomerates on hydrophobic coatings after condensation/evaporation cycles in ambient conditions...
November 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/29168154/the-effect-of-probiotics-on-halitosis-a-systematic-review-and-meta-analysis
#9
REVIEW
Jun-Il Yoo, In-Soo Shin, Jae-Gyu Jeon, Yeon-Mi Yang, Jae-Gon Kim, Dae-Woo Lee
Although several studies have evaluated the inhibitory effect of probiotics on halitosis, findings are inconsistent. This systematic review and meta-analysis of randomized clinical trials (RCT) was conducted to summarize the evidence on the effect of probiotics on halitosis. RCT on any type of probiotic treatment with at least 2-week duration were identified through electronic databases (PubMed, EMBASE, Web of Science, and the Cochrane Central Register of Controlled Trials) and hand searched between 1946 and January 17, 2017...
November 22, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/29164415/decrease-of-insoluble-glucan-formation-in-streptococcus-mutans-by-co-cultivation-with-enterococcus-faecium-t7-and-glucanase-addition
#10
Shin-Hye Yu, So-Hyung Kwak, Thi Thanh Hanh Nguyen, Ye-Seul Seo, Chaeri Song, Il Kyoon Mok, Doman Kim
OBJECTIVES: To develop preventive canine oral health bio-materials consisting of probiotics and glucanase to reduce insoluble glucan and volatile sulfur compound formation. RESULTS: Co-cultivation of Enterococcus faecium T7 with Streptococcus mutans at inoculation ratio of 3:1 (v/v) resulted in 25% reduction in the growth of Streptococcus mutans. Amounts of soluble and insoluble glucans produced by S. mutans were decreased to 70 and 55%, respectively. Insoluble glucan was decreased from 0...
November 21, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/29156617/optimum-thermal-processing-for-extended-shelf-life-esl-milk
#11
REVIEW
Hilton Deeth
Extended shelf-life (ESL) or ultra-pasteurized milk is produced by thermal processing using conditions between those used for traditional high-temperature, short-time (HTST) pasteurization and those used for ultra-high-temperature (UHT) sterilization. It should have a refrigerated shelf-life of more than 30 days. To achieve this, the thermal processing has to be quite intense. The challenge is to produce a product that has high bacteriological quality and safety but also very good organoleptic characteristics...
November 20, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/29146888/halitosis-in-children-with-adenoid-hypertrophy
#12
Małgorzata Sikorska-Żuk, Marek Bochnia
This paper attempts to identify the sources and evaluate the prevalence of halitosis in children with adenoid hypertrophy. The study included pediatric patients admitted for adenoidectomy due to obstructive symptoms. Patients with possibly other causes of halitosis, were excluded from the study. Halitosis was detected in 30 out of 136 children (22.1%). The effect of adenoid hypertrophy on halitosis was confirmed by the significant reduction in the organoleptic score rated according to the Rosenberg Scale (on average by 2 degrees) and the levels of volatile sulfur compounds (VSCs) (on average 84 ppb) post-adenoidectomy, as compared to pre-surgery results...
November 17, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/29146332/micro-oxygenation-does-not-eliminate-hydrogen-sulfide-and-mercaptans-from-wine-it-simply-shifts-redox-and-complex-related-equilibria-to-reversible-oxidized-species-and-complexed-forms
#13
Eduardo Vela, Purificación Hernandez-Orte, Ernesto Franco-Luesma, Vicente Ferreira
This work seeks to assess the effects of micro-oxygenation (MOX) on the present and potential levels of Volatile Sulfur Compounds (VSCs) of wine. With such purpose, three red wines with a tendency to develop sulfury off-odors were subjected to three different MOX conditions (4.4-20mg/L delivered at 0.05 or 0.2mg/L/day). Samples were further subjected to Accelerated Reductive aging (AR) and analyzed for free and Brine Releasable (BR) VSCs and redox potential. Although MOX induced strong decreases in the levels of all free VSCs, hardly affected the ability of the wine to release back hydrogen sulfide and other mercaptans during AR-aging...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29131338/characterization-of-volatile-sulfur-compounds-in-moutai-liquors-by-headspace-solid-phase-microextraction-gas-chromatography-pulsed-flame-photometric-detection-and-odor-activity-value
#14
Shuang Chen, Sha Sha, Michael Qian, Yan Xu
This study investigated the aroma contribution of volatile sulfur compounds (VSCs) in Moutai liquors. The VSCs were analyzed using headspace solid-phase microextraction-gas chromatography-pulsed flame photometric detection (HS-SPME-GC-PFPD). The influences of SPME fibers, ethanol content in the sample, pre-incubation time, and extraction temperature and time on the extraction of VSCs were optimized. The VSCs were optimally extracted using a divinylbenzene/carboxen/polydimethylsiloxane fiber, by incubating 10 mL diluted Chinese liquor (5% vol...
November 13, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29128094/gas-chromatographic-sulphur-speciation-in-heavy-crude-oil-using-a-modified-standard-d5623-method-and-microfluidic-deans-switching
#15
Nicole E Heshka, Joanne M Choy, Jinwen Chen
A modification to American Society for Testing and Materials (ASTM) method D5623 is proposed to enable successful and repeatable analysis of heavy crude oil samples. A two-dimensional gas chromatography configuration was implemented, with separation of sulphur compounds occurring on two columns. A Deans switch is used to enable heart-cutting of volatile sulphur compounds onto a DB-Sulfur stationary phase, and separation occurs concurrently with the backflushing of the primary column. The use of a sulphur-selective detector increases selectivity, and 22 volatile sulphur species are quantified in less than 15min, which is almost half the time of the original ASTM method...
November 4, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29126542/professional-tooth-cleaning-and-scaling-and-root-planing-with-oral-hygiene-instructions-may-reduce-volatile-sulfur-compounds-in-patients-with-periodontal-disease
#16
Tahira Devji
No abstract text is available yet for this article.
November 3, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/29125881/chemical-and-cultural-control-of-tropilaelaps-mercedesae-mites-in-honeybee-apis-mellifera-colonies-in-northern-thailand
#17
Jeffery S Pettis, Robyn Rose, Veeranan Chaimanee
At least two parasitic mites have moved from Asian species of honeybees to infest Apis mellifera. Of these two, Varroa destructor is more widespread globally while Tropilaelaps mercedesae has remained largely in Asia. Tropilaelaps mites are most problematic when A. mellifera is managed outside its native range in contact with Asian species of Apis. In areas where this occurs, beekeepers of A. mellifera treat aggressively for Tropilaelaps and Varroa is either outcompeted or is controlled as a result of the aggressive treatment regime used against Tropilaelaps...
2017: PloS One
https://www.readbyqxmd.com/read/29121704/development-and-metabolite-profiling-of-elephant-garlic-vinegar
#18
Jeong-Won Kim, Deokyeol Jeong, Youngsuk Lee, Dongyup Han, Ju-Ock Nam, Won-Young Lee, Dong-Hyuck Hong, Soo Rin Kim, Yu Shin Ha
Elephant garlic (Allium ampeloprasum var. ampeloprasum), which belongs to the Alliaceae family along with onion and garlic, has a flavor and shape similar to those of normal garlic, but is not true garlic. Additionally, its properties are largely unknown, and its processing and product development have not been reported. In this study, we focused on using elephant garlic to produce a new type of vinegar, for which the market is rapidly growing because of its health benefits. First, we evaluated the effects of elephant garlic addition on acetic acid fermentation of rice wine by Acetobacter pasteurianus...
November 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29107875/the-henry-s-constant-of-monochloramine
#19
Miguel A Garcia, Michael A Anderson
Monochloramine is a secondary disinfectant used in drinking water and is also formed in chlorinated wastewater. While known to hydrolyze over time and react with dissolved organic matter, its partitioning between the aqueous and gas phase has not been extensively studied. Preliminary experiments demonstrated that monochloramine concentrations in solutions open to the atmosphere or actively aerated decreased more rapidly than in sealed solutions, indicating significant losses to the atmosphere. For example, a monochloramine solution open to the atmosphere yielded a loss rate constant of 0...
October 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/29103645/emissions-of-volatile-sulfur-compounds-vscs-throughout-wastewater-biosolids-processing
#20
R M Fisher, N Le-Minh, J P Alvarez-Gaitan, S J Moore, R M Stuetz
Volatile sulfur compounds (VSCs) are important contributors to nuisance odours from the processing of wastewater sludge and biosolids. However, emission characteristics are difficult to predict as they vary between sites and are likely to be affected by biosolids processing configuration and operation. VSC emissions from biosolids throughout 6 wastewater treatment plants (WWTPs) in Sydney, Australia were examined in this study. H2S was the VSC found at the highest concentrations throughout the WWTPs, with concentrations ranging from 7 to 39,000μg/m3...
November 2, 2017: Science of the Total Environment
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