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https://www.readbyqxmd.com/read/28644988/effect-of-marbling-on-volatile-generation-oral-breakdown-and-in-mouth-flavor-release-of-grilled-beef
#1
Damian Frank, Kornelia Kaczmarska, Janet Paterson, Udayasika Piyasiri, Robyn Warner
While the positive effect of intramuscular fat (IMF) on beef tenderness is well-established, its role in flavor generation and flavor release is less defined. To increase understanding, real-time volatile generation was monitored during grilling of beefsteaks (grass and grain-fed Angus and grass-fed Wagyu) with different amounts of IMF by proton transfer reaction mass spectrometry. Volatile concentration increased significantly (p<0.001) when the IMF was >~10%, but did not differ (p>0.05) at lower IMF levels (5...
June 15, 2017: Meat Science
https://www.readbyqxmd.com/read/28644517/quantitative-insights-into-the-fast-pyrolysis-of-extracted-cellulose-hemicelluloses-and-lignin
#2
Marion Carrier, Michael Windt, Bernhard Ziegler, Jörn Appelt, Bodo Saake, Dietrich Meier, Anthony Bridgwater
The transformation of lignocellulosic biomass into bio-based commodity chemicals is technically possible. Among thermochemical processes, fast pyrolysis, a relatively mature technology that has now reached the commercial level, produces a high yield of an organic-rich liquid stream. Despite the recent efforts in elucidating the degradation paths of biomass pyrolysis, the selectivity and recovery rates of bio-compounds remain low. In an attempt to clarify the general degradation scheme of biomass fast pyrolysis and provide a quantitative insight, this study has combined the use of fast pyrolysis micro-reactors, spectrometric techniques and mixtures of unlabelled and Carbon-13 enriched materials...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28644463/hypersensitive-dual-function-luminescence-switching-of-a-silver-chalcogenolate-cluster-based-metal-organic-framework
#3
Ren-Wu Huang, Yong-Sheng Wei, Xi-Yan Dong, Xiao-Hui Wu, Chen-Xia Du, Shuang-Quan Zang, Thomas C W Mak
Silver(i) chalcogenide/chalcogenolate clusters are promising photofunctional materials for sensing, optoelectronics and solar energy harvesting applications. However, their instability and poor room-temperature luminescent quantum yields have hampered more extensive study. Here, we graft such clusters to adaptable bridging ligands, enabling their interconnection and the formation of rigid metal-organic frameworks. By controlling the spatial separation and orientation of the clusters, they then exhibit enhanced stability (over one year) and quantum yield (12...
July 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28644003/chemical-sensor-based-upon-stress-induced-changes-in-the-permeability-of-a-magnetoelastic-wire
#4
Nahla A Hatab, Nichole A Crane, David K Mee, L Neville Howell, Larry R Mooney, Russell L Hallman, Michael J Sepaniak, Vincent E Lamberti
We introduce a chemical sensing technology, named ChIMES (Chemical Identification through Magneto-Elastic Sensing), that can detect a broad range of targets and that has the capability of untethered communication through a metallic or nonmetallic barrier. These features enable many applications in which penetrations into the sampled environment are unwanted or infeasible because of health, safety, or environmental concerns, such as following the decomposition of a dangerous material in a sealed container. The sensing element is passive and consists of a target response material hard-coupled to a magnetoelastic wire...
June 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28643880/effects-of-discrete-bioactive-microbial-volatiles-on-plants-and-fungi
#5
REVIEW
Birgit Piechulla, Marie-Chantal Lemfack, Marco Kai
Plants live in association with microorganisms, which are well known as a rich source of specialized metabolits, including volatile compounds. The increasing numbers of described plant microbiomes allowed manifold phylogenetic tree deductions, but less emphasis is presently put on the metabolic capacities of plant-associated microorganisms. With the focus on small volatile metabolites we summarize i) the knowledge of prominent bacteria of plant microbiomes, ii) present the state-of-the-art of individual (discrete) microbial organic and inorganic volatiles affecting plants and fungi, and iii) emphasize the high potential of microbial volatiles in mediating microbe-plant interactions...
June 23, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28643829/efficient-scavenging-of-criegee-intermediates-on-water-by-surface-active-cis-pinonic-acid
#6
Shinichi Enami, A J Colussi
cis-Pinonic acid (CPA), the main product of the atmospheric oxidation of biogenic α-pinene emissions and a major component of secondary organic aerosol (SOA), is a potentially key species en route to extremely low volatility compounds. Here, we report that CPA is an exceptionally efficient scavenger of Criegee intermediates (CIs) on aqueous surfaces. Against expectations, millimolar CPA (a surface-active C10 keto-carboxylic acid possessing a rigid skeleton) is able to compete with 23 M bulk water for the CIs produced in the ozonolysis of sesquiterpene solutes by O3(g) on the surface of a water:acetonitrile solvent...
June 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28641388/recognition-of-the-component-odors-in-mixtures
#7
Marion E Frank, Dane B Fletcher, Thomas P Hettinger
Natural olfactory stimuli are volatile-chemical mixtures in which relative perceptual saliencies determine which odor-components are identified. Odor identification also depends on rapid selective adaptation, as shown for 4 odor stimuli in an earlier experimental simulation of natural conditions. Adapt-test pairs of mixtures of water-soluble, distinct odor stimuli with chemical features in common were studied. Identification decreased for adapted components but increased for unadapted mixture-suppressed components, showing compound identities were retained, not degraded to individual molecular features...
June 21, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28641144/impact-of-saccharomyces-cerevisiae-and-torulaspora-delbrueckii-starter-cultures-on-cocoa-beans-fermentation
#8
Simonetta Visintin, Lacerda Ramos, Nara Batista, Paola Dolci, Freitas Schwan, Luca Cocolin
Aim of this work was to study the impact of mixed cultures of Saccharomyces cerevisiae and Torulaspora delbrueckii and T. delbrueckii monoculture on the fermentation process conducted on two different cocoa hybrids, PS1319 and SJ02, in Bahia, Brazil. This was performed throughout studying physico-chemical changes during the fermentation process and analyzing volatile compounds and sensory analysis of chocolates. (GTG)5-PCR fingerprinting was used to type isolates at strain level allowing to assess the implantation of the starter cultures added...
June 7, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28640741/an-endophytic-fusarium-sp-isolated-from-monarda-citriodora-produces-the-industrially-important-plant-like-volatile-organic-compound-hexanal
#9
Meenu Katoch, Kushal Bindu, Shipra Phull, M K Verma
An endophytic fungus, MC_25L, has been isolated from the leaves of MonardacitriodoraCerv. ex Lag., a medicinal and aromatic herb from the northwestern Himalayas. It produces a fruity fragrance while growing on potato dextrose agar, suggesting that it is producing volatile organic compounds (VOCs). The endophyte inhibited the growth of plant pathogens such asSclerotiniasp. and Aspergillusflavus by virtue of VOCs. Identification of MC_25L based on morphological and microscopic features, as well as ITS-based rDNA sequence analysis, revealed that it is a Fusariumsp...
June 22, 2017: Microbiology
https://www.readbyqxmd.com/read/28639077/microbial-compositions-and-metabolic-interactions-in-one-and-two-phase-partitioning-airlift-bioreactors-treating-a-complex-voc-mixture
#10
Chao Wu, Peilun Xu, Yinfeng Xia, Wei Li, Sujing Li, Xiangqian Wang
Engineered microbial ecosystems in bioscrubbers for the treatment of volatile organic compounds (VOCs) have been complicated by complex VOC mixtures from various industrial emissions. Microbial associations with VOC removal performance of the bioscrubbers are still not definitive. Here, one- and two-phase partitioning airlift bioreactors were used for the treatment of a complex VOC mixture. Microbial characteristics in both bioreactors were uncovered by high-throughput metagenomics sequencing. Results showed that dominant species with specialized VOC biodegradability were mainly responsible for high removal efficiency of relative individual VOC...
June 21, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28639032/case-study-microbial-ecology-and-forensics-of-chinese-drywall-elemental-sulfur-disproportionation-as-primary-generator-of-hydrogen-sulfide
#11
Francisco A Tomei Torres
Drywall manufactured in China released foul odors attributed to volatile sulfur compounds. These included hydrogen sulfide, methyl mercaptan, and sulfur dioxide. Given that calcium sulfate is the main component of drywall, one would suspect bacterial reduction of sulfate to sulfide as the primary culprit. However, when the forensics, i.e., the microbial and chemical signatures left in the drywall, are studied, the evidence suggests that, rather than dissimilatory sulfate reduction, disproportionation of elemental sulfur to hydrogen sulfide and sulfate was actually the primary cause of the malodors...
June 21, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28639025/characteristics-of-volatile-compound-emission-and-odor-pollution-from-municipal-solid-waste-treating-disposal-facilities-of-a-city-in-eastern-china
#12
Hanwen Guo, Zhenhan Duan, Yan Zhao, Yanjun Liu, Muhammad Farooq Mustafa, Wenjing Lu, Hongtao Wang
Transfer station, incineration plant, and landfill site made up the major parts of municipal solid waste disposal system of S city in Eastern China. Characteristics of volatile compounds (VCs) and odor pollution of each facility were investigated from a systematic perspective. Also major index related to odor pollution, i.e., species and concentration of VCs, olfactory odor concentration, and theoretic odor concentration, was quantified. Oxygenated compounds and hydrocarbons were the most abundant VCs in the three facilities...
June 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28637956/cd36-involvement-in-the-olfactory-perception-of-oleic-aldehyde-an-odour-active-volatile-compound-in-mice
#13
Shinhye Lee, Tsuzuki Satoshi, Takahiko Amitsuka, Daisaku Masuda, Shizuya Yamashita, Kazuo Inoue
Cluster of differentiation 36 (CD36) is a broadly expressed transmembrane receptor that has multiple ligands. It has been found to occur abundantly on the surface of the olfactory epithelium in mice and postulated to play a role in mammalian olfaction. However, there have been no ethological analyses of the mammalian behaviour showing CD36 involvement in the olfactory perception of a distinct odour-active volatile compound. In this study, we aimed to assess whether mammals perceive oleic aldehyde, an odour-active volatile that serves as a potential CD36 ligand, and if so, whether CD36 is involved in the sensing by following measurements using CD36-knockout mice and their wild-type littermates...
2017: Biomedical Research
https://www.readbyqxmd.com/read/28637270/in-planta-recapitulation-of-isoprene-synthases-evolution-from-ocimene-synthases
#14
Mingai Li, Jia Xu, Alberto Algarra Alarcon, Silvia Carlin, Enrico Barbaro, Luca Cappellin, Violeta Velikova, Urska Vrhovsek, Francesco Loreto, Claudio Varotto
Isoprene is the most abundant biogenic volatile hydrocarbon compound naturally emitted by plants and plays a major role in atmospheric chemistry. It has been proposed that isoprene synthases (IspS) may readily evolve from other terpene synthases, but this hypothesis has not been experimentally investigated.We isolated and functionally validated in Arabidopsis the first isoprene synthase gene, AdoIspS, from a monocotyledonous species (Arundo donax L., Poaceae). Phylogenetic reconstruction indicates that AdoIspS and dicots isoprene synthases most likely originated by parallel evolution from TPS-b monoterpene synthases...
June 16, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28636458/contamination-of-firefighter-personal-protective-equipment-and-skin-and-the-effectiveness-of-decontamination-procedures
#15
Kenneth W Fent, Barbara Alexander, Jennifer Roberts, Shirley Robertson, Christine Toennis, Deborah Sammons, Stephen Bertke, Steve Kerber, Denise Smith, Gavin Horn
Firefighters' skin may be exposed to chemicals via permeation/penetration of combustion byproducts through or around personal protective equipment (PPE) or from the cross-transfer of contaminants on PPE to the skin. Additionally, volatile contaminants can evaporate from PPE following a response and be inhaled by firefighters. Using polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs) as respective markers for non-volatile and volatile substances, we investigated the contamination of firefighters' turnout gear and skin following controlled residential fire responses...
June 21, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28635673/toxicity-of-naphthalene-and-benzene-on-tribollium-castaneum-herbst
#16
Nerlis Pajaro-Castro, Karina Caballero-Gallardo, Jesus Olivero-Verbel
Naphthalene and benzene are widely-used volatile organic compounds. The aim of this research was to examine the toxicological effects of naphthalene and benzene against Tribolium castaneum as an animal model. Adult insects were exposed to these aromatic compounds to assess mortality after 4-48 h of exposure. The lethal concentration 50 (LC50) for naphthalene, naphthalin, and benzene were 63.6 µL/L, 20.0 µL/L, and 115.9 µL/L in air, respectively. Real-time polymerase chain reaction (PCR) analysis revealed expression changes in genes related to oxidative stress and metabolism [Glutathione S-Transferase (Gst), and Cytochrome P450 6BQ8 (Cyp6bq8)]; reproduction and metamorphosis [Hormone receptor in 39-like protein (Hr39), Ecdysone receptor: (Ecr), and Chitin synthase 2 (Chs2)]; and neurotransmission [Histamine-gated chloride channel 2 (Hiscl2)] in insects exposed for 4 h to 70...
June 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28635619/on-the-importance-of-accurate-quantification-of-individual-volatile-metabolites-in-exhaled-breath
#17
David Smith, Patrik Spanel
It is argued that shortcomings of certain approaches to breath analysis research based on superficial interpretation of non-quantitative data are inadvertently inhibiting the progression of non-invasive breath analysis into clinical practice. The objective of this perspective is to suggest more clinically profitable approaches to breath research. Thus, following a discourse on the challenges and expectations in breath research, a brief indication is given of the analytical techniques currently used for the analysis of very humid exhaled breath...
June 21, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28633539/a-survey-on-chemical-constituents-and-indications-of-aromatic-waters-soft-drinks-hydrosols-used-in-persian-nutrition-culture-and-folk-medicine-for-neurological-disorders-and-mental-health
#18
Azadeh Hamedi, Ardalan Pasdaran, Zahra Zebarjad, Mahmoodreza Moein
In Persian nutrition culture, drinking aromatic waters (hydrosols, distillate) has a long history as functional beverages or therapeutic remedies. The co-distilled water with essential oils, which contains partial amounts of more water-soluble volatile compounds are diluted and used as beverages. Since the solubility of volatile components is different in water, the overall composition, and thus the biological activities of aromatic waters seem to be different from the essential oils they were co-distilled with...
January 1, 2017: Journal of Evidence-based Complementary & Alternative Medicine
https://www.readbyqxmd.com/read/28633145/urinary-volatile-organic-compounds-as-potential-biomarkers-in-idiopathic-membranous-nephropathy
#19
Mingao Wang, Rujuan Xie, Xibei Jia, Ruichan Liu
OBJECTIVE: To detect urinary volatile organic compounds (VOCs) in patients with idiopathic membranous nephropathy (iMN) and normal controls, and whether or not the urinary VOCs can act as biomarkers for diagnosis of iMN independent of renal biopsy. MATERIALS AND METHODS: Gas chromatography/mass spectrometry (GC/MS) was used to assess the urine collected from 63 iMN patients and 15 normal controls. The statistical methods of principal component analysis (PCA) and partial least squares discriminant analysis (PLSDA) were performed to process the final data in CDF format which were converted from GC/MS data...
June 19, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28632334/functional-analysis-of-female-biased-odorant-binding-protein-6-for-volatile-and-nonvolatile-host-compounds-in-adelphocoris-lineolatus-goeze
#20
L Sun, Q Wang, S Yang, Q Wang, Z Zhang, A Khashaveh, Y-J Zhang, Y-Y Guo
The polyphagous mirid bug Adelphocoris lineolatus relies heavily on olfactory cues to track suitable host plants. Thus, a better understanding of the molecular basis of its olfactory detection could contribute to the development of effective pest management strategies. In the present study, we report the expression profile of the odorant binding protein gene A. lineolatus odorant binding protein 6 (AlinOBP6). Quantitative real-time PCR experiments suggest that AlinOBP6 is female adult antennae-biased. Cellular immunolocalization analyses show that AlinOBP6 is highly expressed in the lymph of both multiporous sensilla basiconica and uniporous sensilla chaetica...
June 20, 2017: Insect Molecular Biology
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