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https://www.readbyqxmd.com/read/28654779/liquid-chromatographic-enantioseparation-of-carbocyclic-%C3%AE-amino-acids-possessing-limonene-skeleton-on-macrocyclic-glycopeptide-based-chiral-stationary-phases
#1
Tímea Orosz, Nóra Grecsó, Gyula Lajkó, Zsolt Szakonyi, Ferenc Fülöp, Daniel W Armstrong, István Ilisz, Antal Péter
Polar-ionic and reversed-phase high-performance liquid chromatographic separations of limonene-based cyclic β-amino acid enantiomers were carried out by using macrocyclic glycopeptide-based chiral selectors applying Chirobiotic T, TAG and R columns. The effects of additives, concentration of the co- and counter-ions and the temperature in polar-ionic mobile phase systems were studied. The influence of pH, MeOH content and alcohol additives were investigated in the reversed-phase mode. The difference in the change in standard enthalpy Δ(ΔH°), entropy Δ(ΔS°), and free energy Δ(ΔG°) was calculated from the linear van't Hoff plots derived from the ln α vs 1/T curves in the temperature range 5-40°C...
June 21, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28634803/a-method-for-reducing-environmental-pollution-by-using-essential-oils-in-rodent-pest-management-program
#2
Goran Jokić, Tanja Blažić, Rada Đurović-Pejčev, Tijana Đorđević, Suzana Đedović, Marina Vukša
Strong-smelling plant extracts, such as essential oils, have a variety of feeding effects on mammals. Considering current concerns over long-term health issues and environmental effects of chemicals, plant-based products with repellent or antifungal activities may represent good solutions for improvement of rodent pest control programs. The present study was therefore focused on examining the effects of bergamot, lavender, and thyme essential oils as additional bait components on daily intakes of cereal-based baits by wild house mice...
June 21, 2017: Environmental Science and Pollution Research International
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
#3
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/28628304/secondary-organic-aerosol-soa-from-nitrate-radical-oxidation-of-monoterpenes-effects-of-temperature-dilution-and-humidity-on-aerosol-formation-mixing-and-evaporation
#4
Christopher M Boyd, Theodora Nah, Lu Xu, Thomas Berkemeier, Nga Lee Ng
Nitrate radical (NO3) oxidation of biogenic volatile organic compounds (BVOC) is important for nighttime secondary organic aerosol (SOA) formation. SOA produced at night may evaporate the following morning due to increasing temperatures or dilution of semivolatile compounds. We isothermally dilute the oxidation products from the limonene+NO3 reaction at 25 °C and observe negligible evaporation of organic aerosol via dilution. The SOA yields from limonene+NO3 are approximately constant (~174%) at 25 °C and range from 81-148% at 40 °C...
June 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28621815/liquid-chromatographic-enantioseparation-of-limonene-based-carbocyclic-%C3%AE-amino-acids-on-zwitterionic-cinchona-alkaloid-based-chiral-stationary-phases
#5
Gyula Lajkó, Tímea Orosz, Imre Ugrai, Zsolt Szakonyi, Ferenc Fülöp, Wolfgang Lindner, Antal Péter, István Ilisz
The eight stereoisomers of limonene-based carbocyclic β-amino acids containing three chiral centers have been directly separated on chiral stationary phases containing Cinchona alkaloid-based zwitterionic selectors. The effects of bulk solvent composition of the mobile phase, the nature of base additives, counter-ion concentration, and the structure of selector on the enantiorecognition were studied. Experiments were performed at constant mobile phase composition in the temperature range 5-40°C to study the effect of temperature...
June 16, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28609696/rapid-prediction-and-identification-of-lipase-inhibitors-in-volatile-oil-from-pinus-massoniana-l-needles
#6
Miao Wang, Dongyu Gu, Haoquan Li, Qi Wang, Jie Kang, Tingting Chu, Hong Guo, Yi Yang, Jing Tian
A facile method based on gas chromatography-mass spectrometry (GC-MS) and molecular docking was established to analyze, identify, and predict lipase inhibitors in volatile oil from Pinus massoniana L. needles (PMLN). The volatile oil, with an IC50 value of 15.25 ± 0.06 μg/mL, exhibited potential inhibitory activity against lipase in vitro. In total, 33 compounds were identified from the volatile oil through GC-MS analysis. The major compounds in the volatile oil were β-pinene (39.24%), α-pinene (14...
June 10, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28605184/modeling-photosensitized-secondary-organic-aerosol-formation-in-laboratory-and-ambient-aerosols
#7
William G Tsui, Yi Rao, Hai-Lung Dai, V Faye McNeill
Photosensitized reactions involving imidazole-2-carboxaldehyde (IC) have been experimentally observed to contribute to secondary organic aerosol (SOA) growth. However, the extent of photosensitized reactions in ambient aerosols remains poorly understood and unaccounted for in atmospheric models. Here we use GAMMA 4.0, a photochemical box model that couples gas-phase and aqueous-phase aerosol chemistry, along with recent laboratory measurements of the kinetics of IC photochemistry, to analyze IC-photosensitized SOA formation in laboratory and ambient settings...
June 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28598172/feasibility-of-photosensitized-reactions-with-secondary-organic-aerosol-particles-in-the-presence-of-volatile-organic-compounds
#8
Kurtis T Malecha, Sergey A Nizkorodov
The ability of a complex mixture of organic compounds found in secondary organic aerosol (SOA) to act as a photosensitizer in the oxidation of volatile organic compounds (VOCs) was investigated. Different types of SOAs were produced in a smog chamber by oxidation of various biogenic and anthropogenic VOCs. The SOA particles were collected from the chamber onto an inert substrate, and the resulting material was exposed to 365 nm radiation in an air flow containing ∼200 ppbv of limonene vapor. The mixing ratio of limonene and other VOCs in the flow was observed with a proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS)...
June 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28588235/parasitic-nematode-meloidogyne-incognita-interactions-with-different-capsicum-annum-cultivars-reveal-the-chemical-constituents-modulating-root-herbivory
#9
Ruth Kihika, Lucy K Murungi, Danny Coyne, Margaret Ng'ang'a, Ahmed Hassanali, Peter E A Teal, Baldwyn Torto
Plant volatile signatures are often used as cues by herbivores to locate their preferred hosts. Here, we report on the volatile organic compounds used by the subterranean root-knot nematode (RKN) Meloidogyne incognita for host location. We compared responses of infective second stage juveniles (J2s) to root volatiles of three cultivars and one accession of the solanaceous plant, Capsicum annum against moist sand in dual choice assays. J2s were more attracted to the three cultivars than to the accession, relative to controls...
June 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28587291/in-vitro-evaluation-of-the-antioxidant-cytoprotective-and-antimicrobial-properties-of-essential-oil-from-pistacia-vera-l-variety-bronte-hull
#10
Antonella Smeriglio, Marcella Denaro, Davide Barreca, Antonella Calderaro, Carlo Bisignano, Giovanna Ginestra, Ersilia Bellocco, Domenico Trombetta
Although the chemical composition and biological properties of some species of the genus Pistacia has been investigated, studies on hull essential oil of Pistacia vera L. variety Bronte (HEO) are currently lacking. In this work, we have carried out an in-depth phytochemical profile elucidation by Gas Chromatography-Mass Spectrometry (GC-MS) analysis, and an evaluation of antioxidant scavenging properties of HEO, using several different in vitro methods, checking also its cytoprotective potential on lymphocytes treated with tert-butyl hydroperoxide...
June 6, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28574456/new-pinane-derivatives-found-in-essential-oils-of-calocedrus-decurrens
#11
Gabriel Garcia, Loïc Tissandié, Jean-Jacques Filippi, Félix Tomi
The main objective of this study was to determine the chemical composition of essential oils (EOs) obtained from leaf, old branches, and young branches of a coniferous species Calocedrus decurrens acclimated to Corsica. The analytical investigation was conducted by GC(RI), GC-MS, pc-GC, and NMR. C. decurrens leaf, old branches, and young branches EOs contained α-pinene (11.2; 56.6; 22.3%), myrcene (13.4; 8.4; 9.7%), Δ-3-carene (31.3; 5.2; 11.1%), limonene (6.4; 5.1; 5.5%), terpinolene (6.9; 1.5; 3.2%), and pin-2-en-8-ol (4...
June 2, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28572945/packaging-methods-and-storage-duration-affect-essential-oil-content-and-composition-of-lemon-verbena-lippia-citriodora-kunth
#12
Mohammad-Taghi Ebadi, Fatemeh Sefidkon, Majid Azizi, Noorollah Ahmadi
Changes in essential oils (EOs) content and composition of lemon verbena leave at different packaging methods (packaged with air, nitrogen, or under vacuum) and during storage period (0, 2, 4, 6 and 8 months) were determined. All the samples were hydrodistilled every 2 months during storage for EO content evaluation. EO composition was determined by gas chromatography and gas chromatography-mass spectrometry. The results showed that by extending the storage period in all packaging methods, EO content was significantly decreased...
May 2017: Food Science & Nutrition
https://www.readbyqxmd.com/read/28567266/a-lewis-acid-%C3%AE-diiminato-zinc-complex-as-all-rounder-for-co-and-terpolymerisation-of-various-epoxides-with-carbon-dioxide
#13
M Reiter, S Vagin, A Kronast, C Jandl, B Rieger
A β-diiminato-zinc-N(SiMe3)2 complex (1) was synthesised and fully characterised, including an X-ray diffraction study. The activity of catalyst 1 towards the coupling reaction of CO2 and various epoxides, including propylene oxide (PO), cyclohexene oxide (CHO), styrene oxide (SO), limonene oxide (LO), octene oxide (OO) and epichlorohydrin (ECH), was investigated. Terpolymerisation of CO2, PO and LO, as well as CO2, CHO and PO, was successfully realised, resulting in polymers with adjustable glass transition temperatures and transparencies...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28554616/essential-oils-as-food-eco-preservatives-model-system-studies-on-the-effect-of-temperature-on-limonene-antibacterial-activity
#14
Katarzyna Hąc-Wydro, Michał Flasiński, Karolina Romańczuk
Antimicrobial properties of essential oils predestine these substances to be used as ecological food preservatives. However, their activity is determined by variety of factors among which external conditions and food properties are highly important. Herein the influence of limonene on artificial membranes was studied to verify the effect of temperature on the incorporation of this compound into model bacterial membrane. The investigations were done on lipid monolayers and the experiments involved the surface pressure-area measurements, penetration studies and Brewster Angle Microscopy analysis...
November 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28549212/synthesis-of-four-monoterpene-derived-organosulfates-and-their-quantification-in-atmospheric-aerosol-samples
#15
Yuchen Wang, Jingyun Ren, X H Hilda Huang, Rongbiao Tong, Jian Zhen Yu
Monoterpenes, a major class of biogenic volatile organic compounds, are known to produce oxidation products that further react with sulfate to form organosulfates. The accurate quantification of monoterpene-derived organosulfates (OSs) is necessary for quantifying this controllable aerosol source; however, it has been hampered by a lack of authentic standards. Here we report a unified synthesis strategy starting from the respective monoterpene through Upjohn dihydroxylation or Sharpless asymmetric dihydroxylation followed by monosulfation with the sulfur trioxide-pyridine complex...
June 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28537253/a-synthetic-biochemistry-platform-for-cell-free-production-of-monoterpenes-from-glucose
#16
Tyler P Korman, Paul H Opgenorth, James U Bowie
Cell-free systems designed to perform complex chemical conversions of biomass to biofuels or commodity chemicals are emerging as promising alternatives to the metabolic engineering of living cells. Here we design a system comprises 27 enzymes for the conversion of glucose into monoterpenes that generates both NAD(P)H and ATP in a modified glucose breakdown module and utilizes both cofactors for building terpenes. Different monoterpenes are produced in our system by changing the terpene synthase enzyme. The system is stable for the production of limonene, pinene and sabinene, and can operate continuously for at least 5 days from a single addition of glucose...
May 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28532258/fumigant-and-repellent-activities-of-essential-oil-extracted-from-artemisia-dubia-and-its-main-compounds-against-two-stored-product-pests
#17
Jun-Yu Liang, Shan-Shan Guo, Wen-Juan Zhang, Zhu-Feng Geng, Zhi-Wei Deng, Shu-Shan Du, Ji Zhang
The major chemical constituents of the essential oil extracted from Artemisia dubia wall. ex Bess. (Family: Asteraceae) were found as terpinolene (19.02%), limonene (17.40%), 2,5-etheno[4.2.2]propella-3,7,9-triene (11.29%), isoelemicin (11.05%) and p-cymene-8-ol (5.93%). Terpinolene and limonene were separated as main components from the essential oil. The essential oil showed fumigant toxicity against Tribolium castaneum and Liposcelis bostrychophila with LC50 values of 49.54 and 0.74 mg/L, respectively. The essential oil and isolated compounds of A...
May 22, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28526637/identification-and-biological-activity-of-the-volatile-compounds-of-glycyrrhiza-triphylla-fisch-c-a-mey
#18
Abolfazl Shakeri, Javad Akhtari, Vahid Soheili, Seyedeh Faezeh Taghizadeh, Amirhossein Sahebkar, Rezvan Shaddel, Javad Asili
Chemical composition and biological (antimicrobial, antioxidant and cytotoxic) activities of essential oils (EO) obtained from the aerial parts of Glycyrrhiza triphylla Fisch. & C.A.Mey (G. triphylla) were evaluated in the present study. The EO was isolated and analyzed using gas chromatography-mass spectrometry (GC-MS). Fifty-five compounds representing 99.3% of the total oil composition were identified. Major components of the oil were β-caryophyllene (25.4%), limonene (16.7%), β-myrcene (16.0%) and α-humulene (4...
May 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28524256/quantification-of-l-carvone-in-toothpastes-available-on-the-swedish-market
#19
Liv Kroona, Gunnar Warfvinge, Marléne Isaksson, Camilla Ahlgren, Jakob Dahlin, Östen Sörensen, Magnus Bruze
BACKGROUND: Toothpastes have widespread use in the population, and contain flavours used to give a pleasant and often minty aroma. Flavours are prevalent allergens in toothpastes, and adverse reactions often present as perioral dermatitis or stomatitis. l-Carvone, a mint flavour found in spearmint oil, is one of these allergens. There are few studies on contact allergy to l-carvone, and some of them have indicated a positive relationship with oral lichenoid lesions. OBJECTIVES: To qualitatively and quantitatively investigate the presence of l-carvone in commercially available toothpastes on the Swedish market...
May 19, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28520791/toxic-and-hormetic-like-effects-of-three-components-of-citrus-essential-oils-on-adult-mediterranean-fruit-flies-ceratitis-capitata
#20
Stella A Papanastasiou, Eleftheria-Maria D Bali, Charalampos S Ioannou, Dimitrios P Papachristos, Kostas D Zarpas, Nikos T Papadopoulos
Plant essential oils (EOs) and a wide range of their individual components are involved in a variety of biological interactions with insect pests including stimulatory, deterrent, toxic and even hormetic effects. Both the beneficial and toxic properties of citrus EOs on the Mediterranean fruit fly (medfly) have been experimentally evidenced over the last years. However, no information is available regarding the toxic or beneficial effects of the major components of citrus EOs via contact with the adults of the Mediterranean fruit fly...
2017: PloS One
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