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Volatile sulfur compounds

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https://www.readbyqxmd.com/read/28221854/effects-of-fish-derived-biological-preservatives-on-cold-storage-of-grass-carp-ctenopharyngodon-idellus-fillets
#1
Tingting Li, Yang Jiang, Gaowei Jin, Qiancheng Zhao, Jianrong Li
Two kinds of fish-derived natural antimicrobial substances, protamine and catfish ( Clarias fuscus ) epidermal mucus extract (CEME), were evaluated for their effect on the quality of grass carp fillets. Fillets were atmosphere packaged in cast polypropylene bags and were stored at 4°C in a low-temperature incubator without light. Solutions (0.5%, wt/vol) of CEME and protamine were used for dip pretreatment, respectively. Bacteriological (aerobic plate count, Shewanella putrefaciens , Pseudomonas fluorescens ) and physicochemical (pH, total volatile basic nitrogen, K value, surface color, texture profiles, water distribution) parameters and volatile odor compounds were measured on days 0, 3, 6, 9, 12, and 15...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28212110/the-impact-of-chewing-gum-on-halitosis-parameters-a-systematic-review
#2
Francisco Wilker Mustafa Gomes Muniz, Stephanie Anagnostopoulos Friedrich, Carina Folgearini Silveira, Cassiano Kuchenbecker Rösing
This study aimed to analyze the impact of chewing gum on halitosis parameters. Three databases were searched with the following focused question: 'Can chewing gum additionally reduce halitosis parameters, such as organoleptic scores and volatile sulfur compounds (VSC), when compared to a control treatment'? Controlled clinical trials presenting at least two halitosis measurements (organoleptic scores and/or VSC) were included. Ten studies were included, and different active ingredients were used. One study was performed using a chewing gum without any active ingredient...
February 17, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28198438/heterogeneous-nucleation-of-trichloroethylene-ozonation-products-in-the-formation-of-new-fine-particles
#3
Ning Wang, Xiaomin Sun, Jianmin Chen, Xiang Li
Free radicals in atmosphere have played an important role in the atmospheric chemistry. The chloro-Criegee free radicals are produced easily in the decomposition of primary ozonide (POZ) of the trichloroethylene, and can react with O2, NO, NO2, SO2 and H2O subsequently. Then the inorganic salts, polar organic nitrogen and organic sulfur compounds, oxygen-containing heterocyclic intermediates and polyhydroxy compounds can be obtained. The heterogeneous nucleation of oxidation intermediates in the formation of fine particles is investigated using molecular dynamics simulation...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193474/a-new-mouthwash-with-low-concentrations-of-chlorhexidine-seems-to-reduce-intraoral-halitosis-and-volatile-sulfur-compounds-in-patients-after-12-hours-of-use
#4
Romina Brignardello-Petersen
No abstract text is available yet for this article.
February 10, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28157284/mechanisms-of-increased-particle-and-voc-emissions-during-dpf-active-regeneration-and-practical-emissions-considering-regeneration
#5
Hiroyuki Yamada, Satoshi Inomata, Hiroshi Tanimoto
Mechanisms involved in increased particle and volatile organic compound (VOC) emissions during active and parked active regenerations of a diesel particulate filter (DPF) were investigated using heavy-duty trucks equipped with both a urea selective catalytic reduction system and a DPF (SCR + DPF) and a DPF-only. Particle emissions increased in the later part of the regeneration period but the mechanisms were different above and below 23 nm. Particles above 23 nm were emitted due to the lower filtering efficiency of the DPF because of the decreasing amount of soot trapped during regeneration...
February 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28109135/assessing-the-hydroxyl-radical-and-volatilization-roles-in-the-aquatic-fate-estimations-of-sulfur-heterocycles-dibenzothiophene-derivatives
#6
Parichehr Saranjampour, Kevin L Armbrust, Brian D Marx
Polycyclic aromatic sulfur heterocycles (PASHs) and their alkyl derivatives can be released into aquatic systems via crude oil spills or via runoff from petroleum treated areas such as asphalt. Dibenzothiophene (DBT) and its derivatives, C1-DBT, C2-DBT, and C4-DBT were chosen as model compounds to investigate the relative impact of volatilization and hydroxyl radical degradation on estimates of their overall dissipation after entry into aquatic ecosystems as a function of depth using the Exposure Analysis Modeling System (EXAMS)...
January 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28040161/evaluation-of-the-spoilage-potential-of-bacteria-isolated-from-chilled-chicken-in%C3%A2-vitro-and-in-situ
#7
Guang-Yu Wang, Hu-Hu Wang, Yi-Wei Han, Tong Xing, Ke-Ping Ye, Xing-Lian Xu, Guang-Hong Zhou
Microorganisms play an important role in the spoilage of chilled chicken. In this study, a total of 53 isolates, belonging to 7 species of 3 genera, were isolated using a selective medium based on the capacity to spoil chicken juice. Four isolates, namely Aeromonas salmonicida 35, Pseudomonas fluorescens H5, Pseudomonas fragi H8 and Serratia liquefaciens 17, were further characterized to assess their proteolytic activities in vitro using meat protein extracts and to evaluate their spoilage potential in situ...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28035791/indirect-plant-defense-against-insect-herbivores-a-review
#8
REVIEW
Zainab Aljbory, Ming-Shun Chen
Plants respond to herbivore attack by launching two types of defenses: direct defense and indirect defense. Direct defense includes all plant traits that increase the resistance of host plants to insect herbivores by affecting the physiology and/or behavior of the attackers. Indirect defense includes all traits that by themselves do not have significant direct impact on the attacking herbivores, but can attract natural enemies of the herbivores and thus reduce plant loss. When plants recognize herbivore-associated elicitors, they produce and release a blend of volatiles that can attract predators, parasites, and other natural enemies...
December 30, 2016: Insect Science
https://www.readbyqxmd.com/read/28029296/characterization-of-kewda-volatile-components-by-comprehensive-two-dimensional-gas-chromatography-time-of-flight-mass-spectrometry
#9
Noohi Nasim, Asit Ray, Subhashree Singh, Sudipta Jena, Ambika Sahoo, Basudeba Kar, I Sriram Sandeep, Sujata Mohanty, Sanghamitra Nayak
Kewda (Pandanus fascicularis Lam.) is a well known medicinal and aromatic plant. The paper aims to precisely characterize volatile constituents present in Kewda flower oil using comprehensive two-dimensional gas chromatography coupled to time of flight mass spectrometry (GCxGC-TOFMS). A total of 159 components were identified due to enhanced chromatographic separation and mass spectral deconvolution of GCxGC-TOFMS. On the basis of its chemical structure, the identified compounds were grouped into hydrocarbons, alcohols, ethers, ketones, esters, nitrogen compounds, aldehydes, acids, lactones, halides and sulfur containing compounds...
April 2017: Natural Product Research
https://www.readbyqxmd.com/read/28011024/the-impact-of-the-air-pollution-prevention-and-control-action-plan-on-pm2-5-concentrations-in-jing-jin-ji-region-during-2012-2020
#10
Siyi Cai, Yangjun Wang, Bin Zhao, Shuxiao Wang, Xing Chang, Jiming Hao
In order to cope with heavy haze pollution in China, the Air Pollution Prevention and Control Action Plan including phased goals of the fine particulate matter (PM2.5) was issued in 2013. In this study, China's emission inventories in the baseline 2012 and the future scenarios of 2017 and 2020 have been developed based on this Action Plan. Beijing-Tianjin-Hebei (Jing-Jin-Ji) region, one of the most polluted regions in China, was taken as a case to assess the impact of phased emission control measures on PM2...
December 20, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28003427/characterization-of-c-s-lyase-from-lactobacillus-delbrueckii-subsp-bulgaricus-atcc-baa-365-and-its-potential-role-in-food-flavor-applications
#11
Alessandra Allegrini, Alessandra Astegno, Valentina La Verde, Paola Dominici
Volatile thiols have substantial impact on the aroma of many beverages and foods. Thus, the control of their formation, which has been linked to C-S lyase enzymatic activities, is of great significance in industrial applications involving food flavors. Herein, we have carried out a spectroscopic and functional characterization of a putative pyridoxal 5'-phosphate (PLP)-dependent C-S lyase from the lactic acid bacterium Lactobacillus delbrueckii subsp. bulgaricus ATCC BAA-365 (LDB C-S lyase). Recombinant LDB C-S lyase exists as a tetramer in solution and shows spectral properties of enzymes containing PLP as cofactor...
December 21, 2016: Journal of Biochemistry
https://www.readbyqxmd.com/read/27999400/comparative-study-on-the-characteristics-of-weissella-cibaria-cmu-and-probiotic-strains-for-oral-care
#12
Hye-Jin Jang, Mi-Sun Kang, Sung-Hun Yi, Ji-Young Hong, Sang-Pil Hong
Probiotics have been demonstrated as a new paradigm to substitute antibiotic treatment for dental caries, gingivitis, and chronic periodontitis. The present work was conducted to compare the characteristics of oral care probiotics: Weissella cibaria CMU (Chonnam Medical University) and four commercial probiotic strains. Survival rates under poor oral conditions, acid production, hydrogen peroxide production, as well as inhibition of biofilm formation, coaggregation, antibacterial activity, and inhibition of volatile sulfur compounds were evaluated...
December 20, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27986317/on-the-summertime-air-quality-and-related-photochemical-processes-in-the-megacity-shanghai-china
#13
Ka Lok Chan, Shanshan Wang, Cheng Liu, Bin Zhou, Mark O Wenig, Alfonso Saiz-Lopez
Summertime surface ozone (O3) and related secondary formation of fine particles are the major air quality concerns in the megacity of Shanghai. We performed mobile Cavity Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) measurements to investigate the spatial distribution of on-road nitrogen dioxide (NO2) concentrations along the Inner Ring Elevated Road (IRER) in Shanghai. The observations show a ratio of 4 between CE-DOAS averaged on-road NO2 and the in-situ ambient measurements, illustrating the strong impact of vehicle emissions over the urban area...
December 14, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27979212/static-headspace-analysis-of-odorants-in-commercial-rice-proteins
#14
Jing Zhao, William L Boatright
Accurate identification of the odor-contributing compounds in aqueous slurries of rice proteins is necessary to improve their overall flavor characteristics. The objective of this study was to identify the primary odorants in rice protein slurries using static headspace analysis. Five commercial rice protein (RP) products, RP-G, RP-O, RP-RM, RP-RS1, and RP-RS2, were analyzed. RP-G contained the lowest levels of most of the odorants. Acetaldehyde was present in the highest amount in RP-O (0.434mg/m(3)). RP-RM had the highest levels of hexanal (5...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27957628/combined-effects-of-fermentation-temperature-and-ph-on-kinetic-changes-of-chemical-constituents-of-durian-wine-fermented-with-saccharomyces-cerevisiae
#15
Yuyun Lu, Marilyn Kai Wen Voon, Dejian Huang, Pin-Rou Lee, Shao-Quan Liu
This study investigated the effects of temperature (20 and 30 °C) and pH (pH 3.1, 3.9) on kinetic changes of chemical constituents of the durian wine fermented with Saccharomyces cerevisiae. Temperature significantly affected growth of S. cerevisiae EC-1118 regardless of pH with a higher temperature leading to a faster cell death. The pH had a more significant effect on ethanol production than temperature with higher production at 20 °C (5.95%, v/v) and 30 °C (5.56%, v/v) at pH 3.9, relative to that at pH 3...
December 12, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27935254/application-of-solid-phase-microextraction-with-gas-chromatography-and-mass-spectrometry-for-the-early-detection-of-active-moulds-on-historical-woollen-objects
#16
Tomasz Sawoszczuk, Justyna Syguła-Cholewińska, Julio M Del Hoyo-Meléndez
The goal of this work was to determine the microbial volatile organic compounds emitted by moulds growing on wool in search of particular volatiles mentioned in the literature as indicators of active mould growth. The keratinolytically active fungi were inoculated on two types of media: (1) samples of wool placed on broths, and (2) on broths containing amino acids that are elements of the structure of keratin. All samples were prepared inside 20 mL vials (closed system). In the first case (1) the broths did not contain any sources of organic carbon, nitrogen, or sulfur, i...
December 9, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27925257/volatile-compounds-produced-by-lactobacillus-paracasei-during-oat-fermentation
#17
Sang Mi Lee, Jieun Oh, Byung-Serk Hurh, Gwi-Hwa Jeong, Young-Keum Shin, Young-Suk Kim
This study investigated the profiles of volatile compounds produced by Lactobacillus paracasei during oat fermentation using gas chromatography-mass spectrometry coupled with headspace solid-phase microextraction method. A total of 60 compounds, including acids, alcohols, aldehydes, esters, furan derivatives, hydrocarbons, ketones, sulfur-containing compounds, terpenes, and other compounds, were identified in fermented oat. Lipid oxidation products such as 2-pentylfuran, 1-octen-3-ol, hexanal, and nonanal were found to be the main contributors to oat samples fermented by L...
December 2016: Journal of Food Science
https://www.readbyqxmd.com/read/27863835/metabolites-profiling-reveals-for-antimicrobial-compositional-differences-and-action-mechanism-in-the-toothbrushing-stick-miswak-salvadora-persica
#18
Mohamed A Farag, Sherifa Fahmy, Mouchira A Choucry, Mariam O Wahdan, Mahmoud Fahmi Elsebai
Among many plant species suitable for preparing toothbrushing sticks, miswak (Salvadora persica, family Salvadoraceae) is found the most effective tool for oral hygiene. S. persica possesses antibacterial, antiviral and antifungal effects against oral microbes, mostly due to its benzyl isothiocyanate content. To provide insight into S. persica chemical composition, volatile constituents from roots and stems of S. persica grown in Egypt and Saudi Arabia were profiled using solid-phase microextraction (SPME) coupled to gas chromatography-mass spectrometry (GC-MS)...
January 30, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27855313/characterization-of-the-clostridium-difficile-volatile-metabolome-using-comprehensive-two-dimensional-gas-chromatography-time-of-flight-mass-spectrometry
#19
Christiaan A Rees, Aimee Shen, Jane E Hill
Clostridium difficile is a bacterial pathogen capable of causing life-threatening infections of the gastrointestinal tract characterized by severe diarrhea. Exposure to certain classes of antibiotics, advanced age, and prolonged hospitalizations are known risk factors for infection by this organism. Anecdotally, healthcare providers have reported that they can smell C. difficile infections in their patients, and several studies have suggested that there may indeed be an olfactory signal associated with C. difficile-associated diarrhea...
December 15, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27833892/pharmacognostic-specification-of-zanthoxylum-limonella-dennst-alston-fruits-and-seeds-in-thailand
#20
Rawiwan Charoensup, Thidarat Duangyod, Pravaree Phuneerub, Chatubhong Singharachai
Zanthoxylum limonella (Dennst.) Alston. (Rutaceae) or Ma-khwaen is one of the medicinal plants in Thai traditional medicine. To investigate the pharmacognostic specifications and chemical constituents of Z. limonella fruits and seeds. Fruits and seeds of Z. limonella were collected from 15 sources throughout Thailand; then examined the pharmacognostic specification following WHO guideline of quality control method for medicinal plant materials. Microscopic determination of Z. limonella powders demonstrated fragment of mesocarp, fragment of brown vitta, oil glands, fragment of endocarp, and endosperm containing oil globule, trichome and pale brown stone cells...
October 2016: Journal of Advanced Pharmaceutical Technology & Research
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