keyword
MENU ▼
Read by QxMD icon Read
search

volatile compound

keyword
https://www.readbyqxmd.com/read/29151153/-2e-6z-9z-2-6-9-pentadecatrienal-as-a-male-produced-aggregation-sex-pheromone-of-the-cerambycid-beetle-elaphidion-mucronatum
#1
Jocelyn G Millar, Robert F Mitchell, Linnea R Meier, Todd D Johnson, Judith A Mongold-Diers, Lawrence M Hanks
An increasing body of evidence suggests that the volatile pheromones of cerambycid beetles are much more diverse in structure than previously hypothesized. Here, we describe the identification, synthesis, and field testing of (2E,6Z,9Z)-2,6,9-pentadecatrienal as a male-produced aggregation-sex pheromone of the cerambycid Elaphidion mucronatum (Say) (subfamily Cerambycinae, tribe Elaphidiini). This novel structure is unlike any previously described cerambycid pheromone, and in field bioassays attracted only this species...
November 18, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/29149662/in-ovo-transformation-of-two-emerging-flame-retardants-in-japanese-quail-coturnix-japonica
#2
Nathalie Briels, Mari E Løseth, Tomasz M Ciesielski, Govindan Malarvannan, Giulia Poma, Sara A Kjærvik, Alexis Léon, Ronan Cariou, Adrian Covaci, Veerle L B Jaspers
Tris(1,3-dichloro-2-propyl) phosphate (TDCIPP) and Dechlorane Plus (DP) are two chlorinated, alternative flame retardants that have been found in wild birds and bird eggs. Little is known about the fate and effect of these compounds in birds, especially during the vulnerable stages of embryonic development. To investigate the ability of birds to biotransform these compounds, an in ovo exposure experiment with Japanese quail eggs was performed. Quail eggs were injected in the yolk sac with 1000ng/g egg of TDCIPP (2...
November 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29146888/halitosis-in-children-with-adenoid-hypertrophy
#3
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
#4
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/29146322/evaluation-of-the-non-aldehyde-volatile-compounds-formed-during-deep-fat-frying-process
#5
Qing Zhang, Chong Wan, Chenzhi Wang, Hong Chen, Yaowen Liu, Suqing Li, Derong Lin, Dingtao Wu, Wen Qin
To investigate the non-aldehyde volatile profile resulting from deep-fat frying, volatile compounds formed during the processes of heating soybean oil (SO), frying wheat dough (WD), and frying chicken breast meat (CBM) were comparatively studied. By using gas chromatography-mass spectrometry and internal standard method, alkanes, alkenes, alkynes, alcohols, ketones, nitrogen-containing volatiles (NCVs), and other volatiles were qualitatively and relatively quantitatively detected. NCVs were detected only in CBM-fried oil samples...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29146315/sensory-olfactometry-and-comprehensive-two-dimensional-gas-chromatography-analyses-as-appropriate-tools-to-characterize-the-effects-of-vine-management-on-wine-aroma
#6
Karine P Nicolli, Aline C T Biasoto, Érica A Souza-Silva, Celito C Guerra, Henrique P Dos Santos, Juliane E Welke, Cláudia A Zini
For the first time, the influence of different vine management was evaluated in relation to volatile profile and sensory perception through GC×GC/TOFMS, QDA, GC-FID, GC/MS, and GC-O. GC×GC/TOFMS analyses and QDA have shown that a larger spacing between vine rows (2 rather than 1m), attachment of shoots upwards, and irrigation did not result in wine improvement. Conversely, wines elaborated with grapes from a vine with a lower bud load (20 per plant; sample M1) stood out among the other procedures, rendering the most promising wine aroma...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29146079/occurrence-of-chlorinated-volatile-organic-compounds-vocs-in-a-sanitary-sewer-system-implications-for-assessing-vapor-intrusion-alternative-pathways
#7
Mohammadyousef Roghani, Olivia P Jacobs, Anthony Miller, Evan J Willett, James A Jacobs, C Ricardo Viteri, Elham Shirazi, Kelly G Pennell
Sewer systems have been recently recognized as potentially important exposure pathways to consider during vapor intrusion assessments; however, this pathway has not been well-characterized and there is need for additional information about the occurrence of volatile organic compounds (VOCs) in sewer systems. This paper reports the results of sewer gas sampling conducted in a sanitary sewer over the years of 2014-2017. Sewer gas samples were collected and analyzed using several different techniques, including TO-15 (grab), TO-17 (passive), Radiello® (passive) and a novel continuous monitoring technique, the Autonomous Rugged Optical Multigas Analyzer (AROMA)...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145848/pharmacological-potential-of-bidens-pilosa-l-and-determination-of-bioactive-compounds-using-uhplc-qqqlit-ms-ms-and-gc-ms
#8
Garima Singh, Ajit Kumar Passsari, Pratibha Singh, Vincent Vineeth Leo, Sarathbabu Subbarayan, Brijesh Kumar, Bhim Pratap Singh, Hauzel Lalhlenmawia, Nachimuthu Senthil Kumar
BACKGROUND: Research of natural products from traditionally used medicinal plants to fight against the human ailments is fetching attention of researchers worldwide. Bidens pilosa Linn. var. Radiata (Asteraceae) is well known for its folkloric medicinal use against various diseases from many decades. Mizoram, North East India, has high plant diversity and the use of this plant as herbal medicine is deep rooted in the local tribes. The present study was executed to understand the pharmacological potential of B...
November 16, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29145172/volatiles-from-cinnamomum-cassia-buds
#9
Daniel Sandner, Ulrich Krings, Ralf G Berger
While the chemical composition of leaf and stem bark essential oils of the Chinese cinnamon, Cinnamomum cassia (L.) J. Presl, has been well investigated, little is known about the volatilom of its buds, which appeared recently on German markets. Soxhlet extracts of the commercial samples were prepared, fractionated using silica gel and characterised by gas chromatography-flame ionisation detector (GC-FID) for semi-quantification, by gas chromatography-mass spectrometry (GC-MS) for identification and by GC-FID/olfactometry for sensory evaluation...
November 16, 2017: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/29145162/biomonitoring-based-exposure-assessment-of-benzene-toluene-ethylbenzene-and-xylene-among-workers-at-petroleum-distribution-facilities
#10
Behzad Heibati, Krystal J Godri Pollitt, Jamshid Yazdani Charati, Alan Ducatman, Mohammad Shokrzadeh, Ali Karimi, Mahmoud Mohammadyan
Elevated emissions of volatile organic compounds, including benzene, toluene, ethylbenzene, and o, p, and m-xylenes (BTEX), are an occupational health concern at oil transfer stations. This exploratory study investigated personal exposure to BTEX through environmental air and urine samples collected from 50 male workers at a major oil distribution company in Iran. Airborne BTEX exposures were evaluated over 8h periods during work-shift by using personal passive samplers. Urinary BTEX levels were determined using solid-phase microextraction with gas chromatography mass spectrometry for separation and detection...
November 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29144986/decadal-changes-in-emissions-of-volatile-organic-compounds-vocs-from-on-road-vehicles-with-intensified-automobile-pollution-control-case-study-in-a-busy-urban-tunnel-in-south-china
#11
Yanli Zhang, Weiqiang Yang, Isobel Simpson, Xinyu Huang, Jianzhen Yu, Zhonghui Huang, Zhaoyi Wang, Zhou Zhang, Di Liu, Zuzhao Huang, Yujun Wang, Chenglei Pei, Min Shao, Donald R Blake, Junyu Zheng, Zhijiong Huang, Xinming Wang
In the efforts at controlling automobile emissions, it is important to know in what extent air pollutants from on-road vehicles could be truly reduced. In 2014 we conducted tests in a heavily trafficked tunnel in south China to characterize emissions of volatile organic compounds (VOC) from on-road vehicle fleet and compared our results with those obtained in the same tunnel in 2004. Alkanes, aromatics, and alkenes had average emission factors (EFs) of 338, 63, and 42 mg km(-1) in 2014 against that of 194, 129, and 160 mg km(-1) in 2004, respectively...
November 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29144301/contamination-levels-and-potential-sources-of-organic-pollution-in-an-asian-river
#12
Chitsan Lin, Kim Anh Nguyen, Chi Thanh Vu, Delia Senoro, Maria Ching Villanueva
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014-June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144134/haloarene-linked-unsymmetrically-substituted-triarylethenes-small-aiegens-to-detect-nitroaromatics-and-volatile-organic-compounds
#13
Moghal Zubair Khalid Baig, Prabhat Kumar Sahu, Moloy Sarkar, Manab Chakravarty
Unsymmetrically substituted triarylalkenes as aggregation-induced emission-active fluorogens (AIEgens) are sporadically explored by different researchers. In this paper, naphthalene, biphenyl and haloarene-linked new triarylethenes are conveniently synthesized and presented as unsymmetrically substituted extensive π-conjugates to continue the discovery of small molecules as new AIEgens. Moreover, fluorophores attached to haloarenes are noteworthy but such compounds are barely investigated as AIEgens. The possible mechanism underlying this AIE-behavior has also been addressed by the support of experimental/theoretical outcomes...
November 16, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29143149/effects-of-intraspecific-and-intra-individual-differences-in-plant-quality-on-preference-and-performance-of-monophagous-aphid-species
#14
Ruth Jakobs, Caroline Müller
Plant chemistry is one of the main drivers of herbivore distribution. Monophagous herbivore species are highly specialized, but even within their only host species the chemistry varies. The herbivore's choice is initially mainly guided by volatile plant compounds. Once on the plant, particularly for aphids the phloem quality affects their performance. However, little is known about the intraspecific and intra-individual variation in phloem sap and their influences on monophagous aphids. To determine potential mechanisms involved in aphid colonization, we tested the effects of intraspecific chemical variation in Tanacetum vulgare, which produces different chemotypes, on the preference of two monophagous aphid species...
November 15, 2017: Oecologia
https://www.readbyqxmd.com/read/29142431/characterization-of-leaf-extracts-of-schinus-terebinthifolius-raddi-by-gc-ms-and-chemometric-analysis
#15
Fabíola B Carneiro, Pablo Q Lopes, Ricardo C Ramalho, Marcus T Scotti, Sócrates G Santos, Luiz A L Soares
Background: Schinus terebinthifolius Raddi belongs to Anacardiacea family and is widely known as "aroeira." This species originates from South America, and its extracts are used in folk medicine due to its therapeutic properties, which include antimicrobial, anti-inflammatory, and antipyretic effects. The complexity and variability of the chemical constitution of the herbal raw material establishes the quality of the respective herbal medicine products. Objective: Thus, the purpose of this study was to investigate the variability of the volatile compounds from leaves of S...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142389/bioactive-constituents-radical-scavenging-and-antibacterial-properties-of-the-leaves-and-stem-essential-oils-from-peperomia-pellucida-l-kunth
#16
Sunday O Okoh, Benson C Iweriebor, Omobola O Okoh, Anthony I Okoh
Background: Peperomia pellucida is an annual herbaceous ethnomedicinal plant used in the treatment of a variety of communicable and noncommunicable diseases in the Amazon region. Objective: The study aimed at profiling the bioactive constituents of the leaves and stem essential oils (LEO and SEO) of P. pellucida, their in vitro antibacterial and radical scavenging properties as probable lead constituents in the management of oxidative stress and infectious diseases...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142292/urinary-volatile-organic-compounds-in-overweight-compared-to-normal-weight-children-results-from-the-italian-i-family-cohort
#17
Rosaria Cozzolino, Beatrice De Giulio, Pasquale Marena, Antonella Martignetti, Kathrin Günther, Fabio Lauria, Paola Russo, Matteo Stocchero, Alfonso Siani
Accumulating evidence shows that urinary volatile organic compounds (VOCs) could be perturbed in many physiological and pathological states, including several diseases and different dietary exposures. Few studies investigated the urinary metabolic signature associated to excess body weight and obesity in adult populations, while a different VOCs profile was found in exhaled breath in obese as compared to lean children. Aim of this study was to evaluate the VOCs profile in the urine of 21 overweight/obese (OW/Ob) and 28 normal-weight (NW) children belonging to the Italian cohort of the I...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141132/intra-species-volatile-interactions-affects-growth-rates-and-exometabolomes-in-aspergillus-oryzae-kccm-60345
#18
Digar Singh, Choong Hwan Lee
The volatile organic compounds (VOCs) are increasingly been recognized as the chemical mediators of mold interactions shaping their community dynamic, growth, and metabolism. Herein, we selectively examined the time-correlated (0 D - 11 D) effects of intra-species VOCs mediated interactions (VMI) on Aspergillus oryzae KCCM 60345 (S1), following co-cultivation with partner strain A. oryzae KACC 44967 (S2), in specially designed twin plate assembly. The comparative evaluation of S1VMI (S1 subjected to VMI with S2) and its control (S1con) showed a notable disparity in their radial growth (S1VMI<S1con) at 5 D, protease activity (S1VMI>S1con) at 3-5 D, amylase activity (S1VMI<S1con) at 3-5 D, and antioxidant levels (S1VMI>S1con) at 3 D...
November 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29138416/plant-to-plant-communication-triggered-by-systemin-primes-anti-herbivore-resistance-in-tomato
#19
Mariangela Coppola, Pasquale Cascone, Valentina Madonna, Ilaria Di Lelio, Francesco Esposito, Concetta Avitabile, Alessandra Romanelli, Emilio Guerrieri, Alessia Vitiello, Francesco Pennacchio, Rosa Rao, Giandomenico Corrado
Plants actively respond to herbivory by inducing various defense mechanisms in both damaged (locally) and non-damaged tissues (systemically). In addition, it is currently widely accepted that plant-to-plant communication allows specific neighbors to be warned of likely incoming stress (defense priming). Systemin is a plant peptide hormone promoting the systemic response to herbivory in tomato. This 18-aa peptide is also able to induce the release of bioactive Volatile Organic Compounds, thus also promoting the interaction between the tomato and the third trophic level (e...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137783/probing-the-radical-chemistry-and-the-reaction-zone-during-the-sono-degradation-of-endocrine-disruptor-2-phenoxyethanol-in-water
#20
Zineb Boutamine, Oualid Hamdaoui, Slimane Merouani
Sonochemical degradation at 600 kHz of 2-phenoxyethanol (PhE), an endocrine disrupting compound, was performed in the presence of several organic additives, namely: 2-propanol, Triton X-100 and sucrose, of different volatilities to obtain detailed information on the reaction zone and the oxidation pathway of this priority emerging water contaminate. It was found that sonication at 600 kHz and 120 W completely remove PhE (10 mg L(-1)) from aerated solutions within 100 min of irradiation. Very little removal of PhE (∼7%) and low accumulation of H2O2 took place in the presence of adequate amount of 2-propanol, indicating that reaction with OH radical outside the bubble is the major degradation pathway of PhE...
March 2018: Ultrasonics Sonochemistry
keyword
keyword
98448
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"