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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Pinene"”.
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Synthesis and application of pinene-pyridine derivatives in asymmetric catalysis
… herein focuses on the synthesis of chiral pinene-pyridine derivatives, and their application in asymmetric catalysis. Both transition metal catalysed and organocatalytic transformations were investigated. Chiral pyridine-phosphines based on α-pinene were synthesised and applied as efficient …
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Chemical and Physical Studies of Secondary Organic Aerosol Formed from Beta-pinene Photooxidation
… (SOA) formation from OH-initiated oxidation of -pinene. The majority of experiments were conducted in the York University smog chamber. The main objective was to identify the gas and particle phase products with an atmospheric pressure chemical ionization mass spectrometer (APCI-MS/MS). A wide …
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Laboratory studies on the production of alpha-pinene-derived organic nitrates and their atmospheric fate
… biogenic volatile organic compounds, such as α-pinene, is highly uncertain, negatively impacting our knowledge on tropospheric ozone production and the fate of atmospheric NO<sub>x</sub>. To lower this uncertainty, we quantified the organic nitrate yield from the OH radical oxidation of α-pinene …
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Investigations of Bicyclo(3.1.1)heptane Terpenes in Higher Plants: Stereochemistry of Pinene Biosynthesis and Isolation of Bergamoten-12-Oic Acids
Cell-free enzyme preparations of (+)-pinene cyclase I and ($-$)-pinene cyclase II isolated from leaves of common sage (Salvia officinalis) are known to convert geranyl pyrophosphate (GPP) to the bicyclic monoterpenes (+)-$\alpha$-pinene (cyclase I) and ($-$)-$\alpha$-pinene and ($-$)-$\beta$-pinene …
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Evaluating the Utility of an Atmospheric Pressure Chemical Ionization Mass Spectrometer for Detecting Organic Peroxides During Beta-Pinene Ozonolysis Experiments
… detect organic peroxide products formed during β-pinene ozonolysis experiments. Detection was based on utilizing the neutral-loss scan (NLS) analysis mode of the APCI-MS/MS to observe ion signals exhibiting unique mass losses of 34 u. This mass loss was considered exclusive to protonated organic …
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Understanding the formation of secondary organic aerosol and the fates of organic nitrates formed from monoterpene oxidation
… (NO3) radical oxidation of monoterpenes (i.e., α-pinene, β-pinene, and limonene). First, the formation and properties of SOA formed from NO3 radical oxidation of α-pinene and limonene were studied. Oxidizing mixtures of monoterpenes simultaneously led to different formation and properties of SOA …
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An Investigation of the Friedel-Crafts Condensation With Homoterpenyl Methyl Ketone.
… to their biological or synthetic values. -Pinene is the well known naturally occurring substance which is the main component in longleaf or slash pine tree oleoresin. a-Pinene and some of its derivatives have been used as starting materials in industrially applied synthetic organic schemes. …
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Stereochemistry, isotope effects, and inhibition of terpene biosynthesis: I. Stereospecificity and mechanism of monoterpene cyclases. II. Inhibition by heteroatom analogs of carbocation intermediates
… effected regiospecific deprotonation, but pinene cyclases I and II from Salvia officinalis deprotonate non-regiospecifically. Deuterium isotope effects on the monoterpene product distribution from incubations of (1-$\sp3$H;8,9-$\sp2$H$\sb6$) GPP with the pinene cyclases are too small to …
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Secondary organic aerosol formation of relevance to the marine boundary layer
… in this study are three monoterpenes (alpha-pinene, beta-pinene, and d-limonene) and two aromatics (m-xylene and toluene), respectively. Results indicate that the oxidation of these monoterpenes and aromatics generates significant amounts of aerosol. The SOA yields of alpha-pinene, …
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Investigação da atividade antifúngica do alfa-pineno sobre cepas de Rhizopus oryzea.
… activity of promising fitoconstituinte, the α-pinene. For this, we determined the minimum inhibitory concentration (MIC), which was used strains of Rhizopus oryzae, belong to the Mycology Laboratory, Federal University of Paraíba (UFPB). The MIC was determined by the microdilution method at …
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Modeling secondary organic aerosol formation from biogenic hydrocarbons
… with three monoterpene species---alpha-pinene, beta-pinene, and d-limonene. The updated CACM and MPMPO modules were calibrated by ozone formation and SOA yield data for alpha-pinene, beta-pinene, and d-limonene from chamber experiments. Then, the updated CACM and MPMPO were incorporated …
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Otimização e avaliação do extrato hidroalcóolico de Schinus terebinthifolius Raddi obtido por ultrasom.
… GC - FID and had a higher c oncentration of α - pinene (0.0225 mL / mL) and limonene (0.1475 mL / mL) in the alcohol content of 80% and 70% respectively. These extracts were evaluated by physical - chemical parameters of pH (4.85, 4.96, 5.36 and 5.79), dry (0.0546 g, 0.0653 g, 1.2074 g a nd …
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Isolation and Characterization of Active Ingredients from Nigella Sativa for Antibacterial Screening.
… <em>p-cymene</em>, and <em>α-pinene</em>, as confirmed by GC/MS and NMR spectroscopy. While <em>p-cymene</em> and α-pinene showed no antibacterial activities, <em>thymoquinone</em>, exhibited remarkable inhibition of the growth of various strains of bacteria. For instance, the …
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Characterization, seasonality and source apportionment of fine particulate organic matter at urban an d rural sites
… compounds analyzed, oxidation products of α-pinene, namely pinic acid and pinonic acid, were identified in all samples. Pinic acid and pinonic acid have low vapor pressures, of the order of 10 -7 Torr, and are expected to contribute significantly to secondary organic aerosol (SOA) formation …
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Organic particle formation in halogen-influenced environments
… aerosol formation from the reaction of α-pinene with chlorine and bromine was studied in laboratory experiments. New particle formation was initiated about five times faster by chlorine than by bromine. While new particle formation was observed at mixing ratios of 2.5 ppb Cl2 and 10 ppb …
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Thermodynamic Measurements by Gas-Liquid Chromatography
… injected. The systems studied were:- 1. a) α-Pinene/Polypropylene Sebacate at 99.8, 120.0, 140.0, 150.0°C. b) β -Pinene/ Polypropylene Sebacate at 100.3, 110.1, 120.0, 150.0°C. 2. a) Dichloro Methane/Silicone Oil MS 200 at 24.8, 29.1, 34.7, 39.8°C. b) 112, Trichloro trifluoro Ethane …
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AVIAN FORAGING RESPONSE TO JACK PINE (PINUS BANKSIANA) VOLATILE CHEMICALS
… I focused on both the difference in the α-pinene to β-pinene ratio between preferred and non-preferred trees and the overall VOC composition of preferred and non-preferred trees. I found significant differences in the VOCs released between preferred and non-preferred trees. These …
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Biofiltración de compuestos orgánicos volátiles utilizando diferentes tipos de lecho basados en mezclas de compost de RSU-poda: monitorización mediante diversas técnicas
… as packing materials to treat vapours of ¿-pinene (a dominant volatile organic compounds (VOC) emitted during the MSW- P co-composting) and Methyl ethyl ketone (MEK). Monitoring the efficiency of the biofiltration system was carried out using a photoionization analyser, a commercial …
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SPECIATION STUDIES FOR BIOGENIC VOLATILE ORGANIC COMPOUNDS AND SECONDARY ORGANIC AEROSOL GENERATED BY OZONOLYSIS OF VOLATILE ORGANIC COMPOUND MIXTURES
… from SOA generated by the ozonolysis of α pinene and VOC mixtures containing α pinene, including two fir needle essential oils, are studied by extracting filter samples and analyzing the extracts by GC/MS. The products generated from VOC mixtures are characteristic of the most dominant VOC …
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Assembly of Life Cycle Inventories using Physical Models and Supervised Learning to support Sustainable Process Development in the Pharmaceutical Industry
… paracetamol manufacture from bio-waste derived β-pinene. An LCI of this alternative synthesis route is estimated based on detailed process models developed in Aspen Plus, and the associated environmental impacts are quantified. A “worst case” GWP of 58 kg CO2-eq./kg product was predicted, and …
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