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Showing 1 to 20 of 36 for “"Guaiacol"”.
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Catalytic Hydrodeoxygenation of Guaiacol over Noble Metal Catalysts
… consumption are still required. In this work, guaiacol, a phenol derived compound produced by the thermal degradation of lignin, was selected as a model compound to study the HDO process. Guaiacol is selected because it is among the major components of pyrolysis bio-oils, but it is thermally …
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A possible condensation of guaiacol, vanillin and sucrose
… their work J. Risi and A. Labrie (1) found that guaiacol and vanillin were among the products derived from the sap of the sugar maple. By using a five percent sucrose solution and equal quantities of vanillin and guaiacol, a little calcium malate and manganese acetate, they obtained an amorphous …
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Understanding Alicyclobacillus Spoilage at the Intersection of Genotype and Environment
… pasteurization methods. The spoilage metabolite guaiacol is only produced by a subset of Alicyclobacillus spp. under specific beverage storage conditions, making precise assessment of spoilage risk a priority for beverage and ingredient producers. In Chapter 1, whole genome sequencing and an ANIb …
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Lignin acrylate derivatives and their behaviors in free radical copolymerizations
Guaiacol and hydroxypropyl-guaiacol were taken as model compounds for lignins and hydroxypropyl lignins to study their vinylation and copolymerization behaviors. Lignin model compounds and lignin were subjected to reaction with isocyanatoethyl methacrylate (IEM) using dibutyltin dilaurate as …
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Lignin Transformation and Characterization of Pyrolytic Products
… to high value-added aromatic monomers (e.g., guaiacol, vanillin, acetovanillone, and eugenol) for synthesis of polymers is of interest. Mineral bases, such as NaOH and CsOH, or supported-metal catalysts (Pt, Ru, Pd, and Ni on C) have been used to form aromatic monomers, but associated …
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ASSESSMENT OF THE FEASIBILITY OF CO-ADMINISTRATION OF PHENOLIC DIETARY COMPOUNDS WITH PHENYLEPHRINE TO INCREASE ITS BIOAVAILABILITY
… cells for 14 - 19 hrs: curcumin 24.5 ± 14.0%, guaiacol 51.3 ± 8.0%, isoeugenol 73.9 ± 4.3%, pterostilbene 70.6 ± 4.2%, resveratrol 14.2 ± 28.0%, zingerone 52.4 ± 14.6%, and the combinations eugenol + propylparaben 42.6 ± 8.4%, vanillin + propylparaben 37.0 ± 11.2%, eugenol + propylparaben + …
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Abiotische frühdiagenetische Redoxprozesse mit Eisen
… Einheiten von Huminstoffen wie Catechol, Guaiacol, Hydrochinon und Resorcin wurden Redoxprozesse mit Eisen(III) untersucht. Mit Ausnahme von Resorcin kann für alle angesetzen Substanzen eine Eisenreduktion festgestellt werden. Bei den Verbindungen Catechol und Guaiacol kann der Einfluß von …
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Rapid separation of phenolic flavourings by liquid chromatography and nanomolar electrochemical detection at a boron-doped diamond electrode
… (CDs) and peak deconvolution reveals guaiacols, phenols and cresol isomers as the phenolic molecular fingerprint of whiskey. Pre-concentration with Nafion on the electrode surface results in a 5-fold decrease in the limit of detection (LOD) compared to the bare BDD electrode. The …
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The separation and identification of "hadromal"
… lesser quantity. This oil was found to contain guaiacol. Pinene and a small amount of resin. As some of the investigation, Risi and Labri (1), who disagreed with Czapek (2) and Hoffmeister (3) used ligroin as the solvent, it is possible that their conclusions that “Hadromal” was composed of …
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Effects of Activated Carbon on Reactions of Free and Combined Chlorine With Phenols (Chlorination, Gac)
… chlorine reacts with a group of phenols (phenol, guaiacol, catechol, 2,6-dimethoxyphenol, p-chlorophenol) in dilute aqueous solutions (10('-5)M), to produce mono-, di-, or trichloroderivatives. When free chlorine reacts with phenols adsorbed on granular activated carbon (GAC), however, many …
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Quantification and Reduction of Exposure to Residential Woodsmoke Particulate Matter
… acid, abietic acid, vanillin, acetovanillone, guaiacol, and 4-ethylguaiacol) in particulate matter. This method was used to analyze particulate matter collected in Libby, MT, a community where woodsmoke is the predominant component of the particulate matter, before, during, and after a …
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Quantification and Reduction of Exposure to Residential Woodsmoke Particulate Matter
… acid, abietic acid, vanillin, acetovanillone, guaiacol, and 4-ethylguaiacol) in particulate matter. This method was used to analyze particulate matter collected in Libby, MT, a community where woodsmoke is the predominant component of the particulate matter, before, during, and after a …
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Catalytic Pyrolysis of Cellulose, Hemicellulose and Lignin Model Compounds
… using low molecular weight kraft lignin, guaiacol, and syringol which were pyrolyzed on sand and VPISU001 HZSM-5 catalyst at 450 °C. The kraft lignin pyrolysis produced low liquid and gas yields and high char yields. The HZSM-5 catalysts increased the water yield and decreased the organic …
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Field measurements and atmospheric simulation chamber studies of selected biomass burning marker compounds
… burning marker compounds, 4-methylcatechol and guaiacol. The ToF-CIMS identified a large range of gas and particle products including polyphenols, nitrophenols, benzoquinones, ring scission species and accretion products, generating new information on the atmospheric degradation pathways. The …
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An investigation of maple flavor
… materials, gums, a phenol thought to be guaiacol, and malic and probably vanillic acid. Ground-work has been done for further investigation into the materials obtained by hydrolysis of the wood.
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Synthesis and properties of lignin epoxide
… was studied by reacting hydroxypropylated guaiacol (a lignin-like model compound) and epichlorohydrin using a catalyst system of potassium hydroxide and a phase transfer catalyst in toluene. The parameters studied were different epichlorohydrin level and temperature. The reaction was …
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Formation of secondary organic aerosol and its processing by atmospheric halogen species – A spectroscopic study
… aliphatic (α-pinene) or aromatic (catechol and guaiacol) precursors and the processing of those model SOAs with simulated molecular and naturally released halogens were studied. Different physicochemical methods were used to study the transformation of those organic aerosols. Infrared and UV/VIS …
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Synthesis and characterization of vanillyl alcohol based thermosetting epoxy resins
… epoxy thermosets. A new bio-based bisphenol (bisguaiacol) was synthesized via electrophilic aromatic condensation of vanillyl alcohol and guaiacol, from which diglycidyl ether of bisguaiacol (DGEBG) was prepared via epoxidation with epichlorohydrin.The thermomechanical properties of DGEBG blended …
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The effects of the High Park fire on Cache la Poudre drinking water quality
… testing samples with a standard smoky compound, guaiacol, FPA results indicated that neither the conventional treatment nor the powdered activated carbon (PAC) treatments removed the smoky smell. However, the benchscale tests conducted with charred riverbed sediment indicated that the smoky …
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