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https://www.readbyqxmd.com/read/28224154/unexpectedly-high-concentrations-of-monoterpenes-in-a-study-of-uk-homes
#1
Chunting Michelle Wang, Benjamin Barratt, Nicola Carslaw, Artemis Doutsi, Rachel E Dunmore, Martyn W Ward, Alastair C Lewis
The abundance of volatile organic compounds (VOCs) found in homes depends on many factors such as emissions, ventilation and the oxidative environment and these are evolving over time, reflecting changes in chemical use, behaviour and building design/materials. The concentrations of VOCs in 25 UK homes of varying ages, design and occupancy were quantified using continuous indoor air sampling over five days. Air was collected through low flow (1 mL min(-1)) constant flow restrictors into evacuated 6 L internally silica-treated canisters until the canisters reached atmospheric pressure...
February 22, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28222179/seed-and-peel-essential-oils-obtained-from-campomanesia-adamantium-fruit-inhibit-inflammatory-and-pain-parameters-in-rodents
#2
Danieli Zuntini Viscardi, Jucicléia da Silva Arrigo, Camila de Azevedo Chaves Correia, Cândida Aparecida Leite Kassuya, Claudia Andrea Lima Cardoso, Iriani Rodrigues Maldonade, Eliana Janet Sanjinez Argandoña
Campomanesia adamantium (Myrtaceae) is popularly known as "gabiroba" and has been used in folk medicine as antirheumatic, antidiarrheal, hypocholesterolemic and anti-inflammatory. This study evaluated the anti-inflammatory and antinociceptive activities and toxicology of essential oils from peel (EOP) and seed (EOS) of C. adamantium fruits in animal models. Different groups were treated with doses of 100 and 300 mg/kg and the inflammatory parameters were evaluated in carrageenan induced paw oedema and leukocyte migration in pleurisy model, while antinociceptive activity was evaluated using formalin method in rodents...
2017: PloS One
https://www.readbyqxmd.com/read/28217135/tps46-a-rice-terpene-synthase-conferring-natural-resistance-to-bird-cherry-oat-aphid-rhopalosiphum-padi-linnaeus
#3
Yang Sun, Xinzheng Huang, Yuese Ning, Weixia Jing, Toby J A Bruce, Fangjun Qi, Qixia Xu, Kongming Wu, Yongjun Zhang, Yuyuan Guo
Plant terpene synthases (TPSs) are key enzymes responsible for terpene biosynthesis, and can play important roles in defense against herbivore attack. In rice, the protein sequence of TPS46 was most closely related to maize TPS10. However, unlike maize tps10, tps46 was also constitutively expressed in rice even in the absence of herbivore attack. Potential roles or constitutive emissions of specific volatiles may due to the constitutive expressions of tps46 in rice. Therefore, in the present study, RNA interference (Ri) and overexpression (Oe) rice lines were generated to investigate the potential function of TPS46 in Oryza sativa sp...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28216091/enantiomeric-and-quantitative-analysis-of-volatile-terpenoids-in-different-teas-camellia-sinensis
#4
Yin Zhu, Chen-Yang Shao, Hai-Peng Lv, Yue Zhang, Wei-Dong Dai, Li Guo, Jun-Feng Tan, Qun-Hua Peng, Zhi Lin
Volatile terpenoids play important roles in the formation of tea aroma quality due to their pleasant scents and low odor thresholds. Most volatile terpenoids contain stereogenic centers, which results in various stereo distributions of their enantiomers and diastereoisomers in different types of tea. However, the distribution characteristics of terpenoid enantiomers in teas were still unclear, which poses an obstacle to the scientific understanding of tea aroma. In this work, a new and efficient analysis approach based on headspace solid phase microextraction (HS-SPME)-chiral gas chromatography-mass spectrometry (GC-MS) was established to analyze 12 pairs of familiar terpenoid enantiomers in different teas...
February 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28215610/converting-s-limonene-synthase-to-pinene-or-phellandrene-synthases-reveals-the-plasticity-of-the-active-site
#5
Jinkun Xu, Ying Ai, Jianhui Wang, Jingwei Xu, Yongkang Zhang, Dong Yang
S-limonene synthase is a model monoterpene synthase that cyclizes geranyl pyrophosphate (GPP) to form S-limonene. It is a relatively specific enzyme as the majority of its products are composed of limonene. In this study, we converted it to pinene or phellandrene synthases after introducing N345A/L423A/S454A or N345I mutations. Further studies on N345 suggest the polarity of this residue plays a critical role in limonene production by stabilizing the terpinyl cation intermediate. If it is mutated to a non-polar residue, further cyclization or hydride shifts occurs so the carbocation migrates towards the pyrophosphate, leading to the production of pinene or phellandrene...
February 15, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28213543/functional-characterization-of-a-28-kb-catabolic-island-from-pseudomonas-sp-m1-involved-in-biotransformation-of-%C3%AE-myrcene-and-related-plant-derived-volatiles
#6
Pedro Soares-Castro, Pedro Montenegro-Silva, Hermann J Heipieper, Pedro M Santos
Pseudomonas sp. M1 is able to mineralize highly hydrophobic and recalcitrant compounds such as benzene, phenol and their methylated/halogenated derivatives, as well as the backbone of several monoterpenes. The ability to use such spectrum of compounds as sole carbon source is, most probably, associated with a genetic background evolved under different environmental constraints. The outstanding performance of M1 strain regarding β-myrcene catabolism was elucidated in this work, with focus on the biocatalytical potential of β-myrcene-associated core-code, comprised in a 28-kb genomic island (GI), predicted to be organized in 8 transcriptional units...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28213148/interface-tuning-and-stabilization-of-monoglyceride-mesophase-dispersions-food-emulsifiers-and-mixtures-efficiency
#7
Sébastien Serieye, Fabienne Méducin, Irena Milošević, Ling Fu, Samuel Guillot
Several food surfactants were examined as possible efficient emulsifiers for liquid crystalline monolinolein-based particles and as alternative choices to the non-food-grade emulsifier conventionally used Pluronic® F127. We described a food emulsifiers' toolbox, investigating their ability to emulsify mesophases (stabilization capacity, particle size, zeta potential) and their impact on internal nanostructures (from swelling to drastic modifications). Among the selected surfactants, sucrose stearate (S1670) was found to be the best candidate for replacing in a long term F127 as an efficient stabilizer of lipid particles...
January 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28188954/comparative-glandular-trichome-transcriptome-based-gene-characterization-reveals-reasons-for-differential-menthol-biosynthesis-in-mentha-species
#8
Md Qussen Akhtar, Nida Qamar, Pallavi Yadav, Pallavi Kulkarni, Ajay Kumar, Ajit Kumar Shasany
The genes involved in menthol biosynthesis are reported earlier in Mentha × piperita. But the information on these genes is not available in Mentha arvensis. To bridge the gap in knowledge on differential biosynthesis of monoterpenes leading to compositional variation in the essential oil of these species, a comparative transcriptome analysis of the glandular trichome was carried out. In addition to the MVA and MEP pathway genes, about 210 and 196 different terpene synthases (TPS) transcripts were identified from annotation in M...
February 11, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28183269/transcriptome-profilings-of-two-tall-fescue-festuca-arundinacea-cultivars-in-response-to-lead-pb-stress
#9
Huiying Li, Tao Hu, Erick Amombo, Jinmin Fu
BACKGROUND: Lead (Pb) is one of the most toxic heavy metal environmental pollutants. Tall fescue is an important cold season turf grass which can tolerate and accumulate substantial amount of Pb. To estimate genes related to Pb response and the molecular mechanism associated with Pb tolerance and accumulation, we analyzed the transcriptome of tall fescue in response to Pb treatment. RESULTS: RNA-sequencing was performed in two tall fescue cultivars, Pb tolerant Silverado and Pb sensitive AST7001...
February 10, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28182421/encapsulation-of-polymethoxyflavones-in-citrus-oil-emulsion-based-delivery-systems
#10
Ying Yang, Chengying Zhao, Jingjing Chen, Guifang Tian, David Julian McClements, Hang Xiao, Jinkai Zheng
The purpose of this work was to elucidate the effects of citrus oil type on polymethoxyflavone (PMF) solubility and on the physicochemical properties of PMF-loaded emulsion-based delivery systems. Citrus oils were extracted from mandarin, orange, sweet orange, and bergamot. The major constituents were determined by GC/MS: sweet orange oil (97.4% d-limonene); mandarin oil (72.4% d-limonene); orange oil (67.2% d-limonene); and bergamot oil (34.6% linalyl acetate and 25.3% d-limonene). PMF-loaded emulsions were fabricated using 10% oil phase (containing 0...
February 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28177735/protective-effects-of-essential-oil-of-citrus-limon-against-aspirin-induced-toxicity-in-iec-6-cells
#11
Hafsia Bouzenna, Najla Hfaiedh, Marie-Agnès Giroux-Metges, Abdelfattah Elfeki, Hélène Talarmin
Aspirin, one of the widely used non-steroidal anti-inflammatory drugs, is the most highly consumed pharmaceutical product in the world. However, it has several side effects in cells. This study was designed to investigate the antioxidative activity and cytoprotective effects of essential oil of Citrus limon (EOC) extracted from leaves against aspirin-induced damages in the rat small intestine epithelial cells (IEC-6). Biochemical indicators were used to assess cytotoxicity and oxidative damages caused by aspirin treatment on IEC-6...
December 15, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28170149/essential-oil-and-bioactive-compounds-variation-in-myrtle-myrtus-communis-l-as-affected-by-seasonal-variation-and-salt-stress
#12
Zeinab Vafadar Shoshtari, Mehdi Rahimmalek, Mohammad Reza Sabzalian, Hossein Hosseini
The effect of different NaCl concentrations (control, 2, 4 and 6 dS m-1) and three harvesting times in different seasons including spring (9 April), summer (5 July) and fall (23 September) was evaluated on essential oil yield, composition, phenolic, flavonoid content and antioxidant activity of myrtle. Essential oil yield ranged from 0.2% in control and fall to 1.6% in moderate salinity (4 dS m-1) and spring season. The main constituents obtained from GC-MS analysis were α-pinene, 1,8-cineole, limonene, linalool, α-terpineol and linalyl acetate in which α-pinene ranged from 11...
February 7, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28161182/differential-effects-of-monensin-and-a-blend-of-essential-oils-on-rumen-microbiota-composition-of-transition-dairy-cows
#13
M Schären, C Drong, K Kiri, S Riede, M Gardener, U Meyer, J Hummel, T Urich, G Breves, S Dänicke
In response to oral application, monensin alters the rumen microbiota, increasing ruminal propionate production and energy availability in the animal. Data from different studies indicate that the susceptibility of rumen bacteria to monensin is mainly cell-wall dependent but tracing its activity to specific microbial groups has been challenging. Several studies have shown a similar effect for essential oils but results are inconsistent. To investigate the influence of monensin and a blend of essential oils (BEO, containing thymol, guaiacol, eugenol, vanillin, salicylaldehyde, and limonene) on the rumen microbiome, rumen liquid samples were collected orally on d 56 postpartum from cows that had either received a monensin controlled-release capsule 3 wk antepartum, a diet containing a BEO from 3 wk antepartum onward, or a control diet (n = 12)...
February 1, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28134284/weeding-volatiles-reduce-leaf-and-seed-damage-to-field-grown-soybeans-and-increase-seed-isoflavones
#14
Kaori Shiojiri, Rika Ozawa, Ken-Ichi Yamashita, Masayoshi Uefune, Kenji Matsui, Chigen Tsukamoto, Susumu Tokumaru, Junji Takabayashi
Field experiments were conducted over 3 years (2012, 2013, and 2015), in which half of the young stage soybean plants were exposed to volatiles from cut goldenrods three times over 2-3 weeks, while the other half remained unexposed. There was a significant reduction in the level of the total leaf damage on exposed soybean plants compared with unexposed ones. In 2015, the proportion of damage to plants by Spodoptera litura larvae, a dominant herbivore, was significantly less in the exposed field plots than in the unexposed plots...
January 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28131447/emission-characteristics-of-allergenic-terpenols-in-pm2-5-released-from-incense-burning-and-the-effect-of-light-on-the-emissions
#15
Su-Ching Kuo, Ying I Tsai
This study investigated allergenic terpenol compounds in incense powder and smoke. The powder of two Thai brands contained higher concentrations of terpenols up to 6.15 times higher than those of two Taiwanese brands. Consequently, Thai incense makers face a higher potential risk of contact dermatitis than Taiwanese incense makers do. d-Limonene was the primary terpenol compound in the powder of Thai B (64.0%) and Thai Y (31.5%), sold in Thailand. By contrast, anisyl alcohol was the primary terpenol compound in the powder of LST (40...
January 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28126407/effects-by-inhalation-of-abundant-fragrances-in-indoor-air-an-overview
#16
REVIEW
Peder Wolkoff, Gunnar D Nielsen
Odorous compounds (odors) like fragrances may cause adverse health effects. To assess their importance by inhalation, we have reviewed how the four major abundant and common airborne fragrances (α-pinene (APN), limonene (LIM), linalool (LIL), and eugenol (EUG)) impact the perceived indoor air quality as odor annoyance, sensory irritation and sensitization in the airways. Breathing and cardiovascular effects, and work performance, and the impact in the airways of ozone-initiated gas- and particle phase reactions products have also been assessed...
January 23, 2017: Environment International
https://www.readbyqxmd.com/read/28122144/chemical-composition-and-behavioral-effects-of-five-plant-essential-oils-on-the-green-pea-aphid-acyrthosiphon-pisum-harris-homoptera-aphididae
#17
Abir Kasmi, Majdi Hammami, Emmanuel G Raoelison, Manef Abderrabba, Jalloul Bouajila, Christine Ducamp
Essential oils (EOs) from Schinus molle, Helichrysum gymnocephalum, Cedrelopsis grevei and Melaleuca viridiflora, four aromatic and medicinal plants, are commonly used in folk medicine. EOs were characterized by Gas Chromatography-Mass Spectrometry (GC-MS) and quantified by Gas Chromatography-Flame Ionization Detection (GC-FID); then evaluated for their behavioral effects on adults of the green pea aphid Acyrthosiphon pisum (Harris) using a Perspex four-armed olfactometer in order to test the compatibility of their use as phytoinsecticides to control this insect pest...
January 25, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28117697/1-butyl-3-methylimidazolium-tetrafluoroborate-film-as-a-highly-selective-sensing-material-for-non-invasive-detection-of-acetone-using-a-quartz-crystal-microbalance
#18
Wenyan Tao, Peng Lin, Sili Liu, Qingji Xie, Shanming Ke, Xierong Zeng
Breath acetone serves as a biomarker for diabetes. This article reports 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF₄]), a type of room temperature ionic liquid (RTIL), as a selective sensing material for acetone. The RTIL sensing layer was coated on a quartz crystal microbalance (QCM) for detection. The sensing mechanism is based on a decrease in viscosity and density of the [bmim][BF₄] film due to the solubilization of acetone leading to a positive frequency shift in the QCM. Acetone was detected with a linear range from 7...
January 20, 2017: Sensors
https://www.readbyqxmd.com/read/28113096/utilization-of-fermented-soybeans-paste-as-flavoring-lamination-for-turkish-dry-cured-meat
#19
Abdulatef Ahhmed, Ceyda Özcan, Safa Karaman, İsmet Öztürk, Mustafa Çam, Peter O Fayemi, Gen Kaneko, Michio Muguruma, Ryoichi Sakata, Hasan Yetim
The effects of utilizing fermented soybeans paste (miso) as an alternative flavor-coating material for eliminating unpleasant odor of sulphuric and sotolone compounds from cemen in commercial pastirma were investigated. Results showed that miso-pastirma (MP) and commercial pastirma (CP) had higher L* values in comparison with the fresh meat. While no pathogen was detected in all the meat samples, statistically significant stearic acid was increased (P<0.05) and also oleic and arachidic acids were observed in MP...
December 23, 2016: Meat Science
https://www.readbyqxmd.com/read/28111415/permeation-of-limonene-through-disposable-nitrile-gloves-using-a-dextrous-robot-hand
#20
Sean Banaee, Shane S Que Hee
OBJECTIVES: The purpose of this study was to investigate the permeation of the low-volatile solvent limonene through different disposable, unlined, unsupported, nitrile exam whole gloves (blue, purple, sterling, and lavender, from Kimberly-Clark). METHODS: This study utilized a moving and static dextrous robot hand as part of a novel dynamic permeation system that allowed sampling at specific times. Quantitation of limonene in samples was based on capillary gas chromatography-mass spectrometry and the internal standard method (4-bromophenol)...
January 21, 2017: Journal of Occupational Health
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