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Volatile sulfur compounds

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https://www.readbyqxmd.com/read/27925257/volatile-compounds-produced-by-lactobacillus-paracasei-during-oat-fermentation
#1
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
#2
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
#3
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...
November 9, 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
#4
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
https://www.readbyqxmd.com/read/27822973/malodorous-volatile-organic-sulfur-compounds-sources-sinks-and-significance-in-inland-waters
#5
Susan B Watson, Friedrich Jüttner
Volatile Organic Sulfur Compounds (VOSCs) are instrumental in global S-cycling and greenhouse gas production. VOSCs occur across a diversity of inland waters, and with widespread eutrophication and climate change, are increasingly linked with malodours in organic-rich waterbodies and drinking-water supplies. Compared with marine systems, the role of VOSCs in biogeochemical processes is far less well characterized for inland waters, and often involves different physicochemical and biological processes. This review provides an updated synthesis of VOSCs in inland waters, focusing on compounds known to cause malodours...
November 8, 2016: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/27799940/inhibitory-effect-of-enterococcus-faecium-wb2000-on-volatile-sulfur-compound-production-by-porphyromonas-gingivalis
#6
Nao Suzuki, Takuya Higuchi, Masato Nakajima, Akie Fujimoto, Hiromitsu Morita, Masahiro Yoneda, Takashi Hanioka, Takao Hirofuji
Volatile sulfur compounds (VSCs) produced by oral anaerobes are the major compounds responsible for oral malodor. Enterococcus faecium WB2000 is recognized as an antiplaque probiotic bacterium. In this study, the effect of E. faecium WB2000 on VSC production by Porphyromonas gingivalis was evaluated, and the mechanism of inhibition of oral malodor was investigated. P. gingivalis ATCC 33277 was cultured in the presence of four lactic acid bacteria, including E. faecium WB2000. Subsequently, P. gingivalis ATCC 33277, W50, W83, and two clinical isolates were cultured in the presence or absence of E...
2016: International Journal of Dentistry
https://www.readbyqxmd.com/read/27789516/behavioral-response-of-the-malaria-mosquito-anopheles-gambiae-to-human-sweat-inoculated-with-axilla-bacteria-and-to-volatiles-composing-human-axillary-odor
#7
Jérôme Frei, Thomas Kröber, Myriam Troccaz, Christian Starkenmann, Patrick M Guerin
The responses of Anopheles gambiae Giles sensu stricto (Diptera: Culicidae) to odors from male and female axillary sweat incubated with human axilla bacteria were recorded in a dual-choice olfactometer. Staphylococcus epidermidis was selected for its low odor-producing pattern, Corynebacterium jeikeium for its strong Nα-acylglutamine aminoacylase activity liberating carboxylic acids including (R)/(S)-3-hydroxy-3-methylhexanoic acid (HMHA) and Staphylococcus haemolyticus for its capacity to liberate sulfur-containing compounds including (R/S)-3-methyl-3-sulfanylhexan-1-ol (MSH)...
October 27, 2016: Chemical Senses
https://www.readbyqxmd.com/read/27784920/the-effect-of-ginger-and-garlic-addition-during-cooking-on-the-volatile-profile-of-grass-carp-ctenopharyngodon-idella-soup
#8
Jin-Lin Li, Zong-Cai Tu, Lu Zhang, Xiao-Mei Sha, Hui Wang, Juan-Juan Pang, Ping-Ping Tang
Ginger and garlic have long been used in Asian countries to enhance the flavor and to neutralize any unpleasant odors present in fish soup. The purpose of this study was to evaluate the change in the amount of volatile components present in fish soup compared to boiled water solutions of ginger and garlic. The fish soup was prepared by boiling oil-fried grass carp (Ctenopharyngodon idella) with or without ginger and/or garlic. Generally, boiling garlic and ginger in water led to a decrease in the amount of the principal volatile constituents of these spices, together with the formation of some new volatiles such as pentanal, hexanal, and nonanal...
August 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27765208/studies-on-the-volatile-fraction-composition-of-three-native-amazonian-brazilian-fruits-murici-byrsonima-crassifolia-l-malpighiaceae-bacuri-platonia-insignis-m-clusiaceae-and-sapodilla-manilkara-sapota-l-sapotaceae
#9
Thais M Uekane, Luca Nicolotti, Alessandra Griglione, Humberto R Bizzo, Patrizia Rubiolo, Carlo Bicchi, Maria Helena M Rocha-Leão, Claudia M Rezende
The volatile fraction of murici, bacuri and sapodilla are here studied because of their increasing interest for consumers, abundance of production in Brazil, and the general demand for new flavors and aromas. Their volatile profiles were studied by two High Concentration Capacity Headspace techniques (HCC-HS), Headspace Solid Phase Microextraction (HS-SPME) and Headspace Sorptive Extraction (HSSE), in combination with GC-MS. Murici volatile fraction mainly contains esters (38%), carboxylic acids (19%), aldehydes (11%), alcohols (14%), others (13%) and sulfur compounds; bacuri is characterized by terpenes (41%), non-terpenic alcohols (24%), esters (15%), aldehydes (6%), and others (12%); sapodilla consists of esters (33%), alcohols (27%), terpenes (18%) and others (21%)...
March 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27753430/light-activated-antimicrobial-agents-can-inactivate-oral-malodour-causing-bacteria
#10
Marika Rai, David Spratt, Paola R Gomez-Pereira, Jay Patel, Sean P Nair
Oral malodour is a common condition which affects a large proportion of the population, resulting in social, emotional and psychological stress. Certain oral bacteria form a coating called a biofilm on the tongue dorsum and degrade organic compounds releasing volatile sulfur compounds that are malodourous. Current chemical treatments for oral malodour such as mouthwashes containing chlorhexidine or essential oils, are not sufficiently effective at reducing the bacterial load on the tongue. One potential alternative to current chemical treatments for oral malodour is the use of light activated antimicrobial agents (LAAAs), which display no toxicity or antimicrobial activity in the dark, but when exposed to light of a specific wavelength produce reactive oxygen species which induce damage to target cells in a process known as photodynamic inactivation...
October 18, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27750382/effect-of-fermentation-temperature-on-the-volatile-composition-of-kimchi
#11
Sang Pil Hong, Eun Joo Lee, Young Ho Kim, Dong Uk Ahn
This study was conducted to evaluate the effect of fermentation temperature on the volatile composition in Kimchi. Kimchi was fermented at 2 temperature conditions (4 and 20 °C). Volatile compounds of Kimchi samples were analyzed during the fermentation periods using the dynamic headspace gas chromatography-mass spectrometry method. The optimum ripening time for the Kimchi fermented at 4 °C was 35 d, and that of 20 °C was 2 d. The pH at the optimum ripening time was 4.97 and 4.41, and the titratable acidity was 0...
October 17, 2016: Journal of Food Science
https://www.readbyqxmd.com/read/27736270/ultrastructural-changes-in-epithelial-cells-of-rats-exposed-to-low-concentration-of-hydrogen-sulfide-for-50-days
#12
Defne Yalçın Yeler, Murat Aydın, Peyami Turgay Hocaoğlu, Melike Koraltan, Hakan Özdemir, Tuğba Kotil, Mehmet Gül
Hydrogen sulfide (H2S) and other volatile sulfur compounds (VSCs) appear mainly in the oral air of patients with halitosis. It seems that VSCs are directly involved in the pathogenesis of gingival diseases. In previous studies, short-term (7 hours-4 days), high concentrations (5-400 ppm) of H2S applications on periodontal tissues have been evaluated in a culture medium. The aim of the present study was to investigate the potential effects of lower (equivalent to halitosis) concentrations of H2S on rat gingival tissue for longer-term inhalation...
November 2016: Ultrastructural Pathology
https://www.readbyqxmd.com/read/27732570/storage-stability-of-exhaled-breath-on-tenax-ta
#13
Sean W Harshman, Nilan Mani, Brian A Geier, Jae Kwak, Phillip Shepard, Maomian Fan, Gregory L Sudberry, Ryan S Mayes, Darrin K Ott, Jennifer A Martin, Claude C Grigsby
Exhaled breath is coming to the forefront of non-invasive biomarker discovery efforts. Concentration of exhaled breath volatile organic compounds (VOCs) on thermal desorption (TD) tubes with subsequent analysis by gas chromatography-mass spectrometry (GC-MS) has dominated this field. As discovery experimentation increases in frequency, the need to evaluate the long-term storage stability of exhaled breath VOCs on thermal desorption adsorbent material is critical. To address this gap, exhaled breath was loaded on Tenax TA thermal desorption tubes and stored at various temperature conditions...
October 12, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27728823/reduction-of-nitrous-oxide-emissions-from-biological-nutrient-removal-processes-by-thermal-decomposition
#14
Philip B Pedros, Omid Askari, Hameed Metghalchi
During the last decade municipal wastewater treatment plants have been regulated with increasingly stringent nutrient removal requirements including nitrogen. Typically biological treatment processes are employed to meet these limits. Although the nitrogen in the wastewater stream is reduced, certain steps in the biological processes allow for the release of gaseous nitrous oxide (N2O), a greenhouse gas (GHG). A comprehensive study was conducted to investigate the potential to mitigate N2O emissions from biological nutrient removal (BNR) processes by means of thermal decomposition...
October 4, 2016: Water Research
https://www.readbyqxmd.com/read/27726021/identification-of-a-yeast-strain-able-to-oxidize-and-remove-sulfide-high-efficiently
#15
Rongyu Zhuang, Yongjiang Lou, Xiaoting Qiu, Yangyong Zhao, Dong Qian, Xiaojun Yan, Xiaodie He, Qingqing Shen, Lizhen Qian
Hydrogen sulfide is a common odor gas of volatile sulfur-containing compound. The emission of hydrogen sulfide in the waste gas from industrial processing and agricultural operations could cause air pollution to the surrounding environment. The aim of this study was screening and isolation of wild yeast strains from the sludge of sewage pool in the fishmeal processing plant to remove hydrogen sulfide odor. A yeast strain ZJY-7 was obtained. Its hydrogen sulfide removal efficiency was 97.1 %. The morphology studies were investigated using microscope and scanning electron microscope...
October 10, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27723960/silver-ion-polyelectrolyte-container-as-a-sensitive-quartz-crystal-microbalance-gas-detector
#16
Yosuke Tsuge, Yukari Moriyama, Yuki Tokura, Seimei Shiratori
A polyelectrolyte film containing metastable silver ions was applied as quartz crystal microbalance (QCM) gas detector. The polyelectrolyte film was obtained by immersing a polyelectrolyte with numerous amine groups in a metal ion solution. The QCM detector with silver ions responded to a very low methylmercaptan gas concentration (20 ppb), but did not respond to ammonia, volatile amines, aromatic compounds, or alcohols. The response speed of the QCM detector increased gradually with increasing methylmercaptan concentrations...
October 11, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27719896/analysis-of-seven-salad-rocket-eruca-sativa-accessions-the-relationships-between-sensory-attributes-and-volatile-and-non-volatile-compounds
#17
Luke Bell, Lisa Methven, Angelo Signore, Maria Jose Oruna-Concha, Carol Wagstaff
Sensory and chemical analyses were performed on accessions of rocket (Eruca sativa) to determine phytochemical influences on sensory attributes. A trained panel was used to evaluate leaves, and chemical data were obtained for polyatomic ions, amino acids, sugars and organic acids. These chemical data (and data of glucosinolates, flavonols and headspace volatiles previously reported) were used in Principal Component Analysis (PCA) to determine variables statistically important to sensory traits. Significant differences were observed between samples for polyatomic ion and amino acid concentrations...
March 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27697680/developing-a-vacuum-thermal-stripping-acid-absorption-process-for-ammonia-recovery-from-anaerobic-digester-effluent
#18
Anayo T Ukwuani, Wendong Tao
To prevent acetoclastic methanogens from ammonia inhibition in anaerobic digestion of protein-rich substrates, ammonia needs to be removed or recovered from digestate. This paper presents an innovative ammonia recovery process that couples vacuum thermal stripping with acid absorption. Ammonia is stripped out of digestate boiling at a temperature below the normal boiling point due to vacuum. Stripped ammonia is absorbed to a sulfuric acid solution, forming ammonium sulfate crystals as a marketable product. Three common types of digestate were found to have boiling point temperature-vacuum curves similar to water...
September 27, 2016: Water Research
https://www.readbyqxmd.com/read/27659093/smelling-sulfur-copper-and-silver-regulate-the-response-of-human-odorant-receptor-or2t11-to-low-molecular-weight-thiols
#19
Shengju Li, Lucky Ahmed, Ruina Zhang, Yi Pan, Hiroaki Matsunami, Jessica L Burger, Eric Block, Victor S Batista, Hanyi Zhuang
Mammalian survival depends on ultrasensitive olfactory detection of volatile sulfur compounds, since these compounds can signal the presence of rancid food, O2 depleted atmospheres, and predators (through carnivore excretions). Skunks exploit this sensitivity with their noxious spray. In commerce, natural and liquefied gases are odorized with t-BuSH and EtSH, respectively, as warnings. The 100-million-fold difference in olfactory perception between structurally similar EtSH and EtOH has long puzzled those studying olfaction...
October 3, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27628731/high-amounts-of-n-alkanes-in-the-composition-of-asphodelus-aestivus-brot-flower-essential-oil-from-cyprus
#20
Kaan Polatoğlu, Betül Demirci, Kemal Hüsnü Can Başer
There is only a couple of reports indicating essential oil composition of Asphodelus species in the literature. However, from the members of this genus many non-volatile secondary metabolites were isolated. In Cyprus, Asphodelus aestivus Brot. can be found abundantly in all regions of the island. This plant has various ethnobotanical uses in Cyprus. There is no report on the volatiles nor the essential oil composition of A. aestivus. The smell of A. aestivus flowers resembles that of a cat pee which caught our attention...
October 1, 2016: Journal of Oleo Science
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