phenolic hydroxyl
Influence of Ortho Group Introduction on the Alkylation of Phenolic Hydroxyl of Apocynin
... nolic hydroxyl were designed and synthesized to further discuss their influence on the reaction activity of the phenolic hydroxyl ...of phenolic hydroxyl. It enabled the alkylation of ...
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The antityrosinase and antioxidant activities of flavonoids dominated by the number and location of phenolic hydroxyl groups
... The combination mode and binding sites of tyrosinase and five typical compounds were studied by molecular simulation. The results showed that these compounds enter the hydrophobic activity cavity of tyrosinase, change ...
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Lignin valorization: lignin nanoparticles as high-value bio-additive for multifunctional nanocomposites
... In the work reported here, we assessed the technical feasibility of valorizing lignin through producing LNPs/ polymer nanocomposite films with both UV-shielding and antioxidant functionalities. Two technical lignins, DES ...
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Effect of the Pre Treatment Severity on the Antioxidant Properties of Ethanol Organosolv Miscanthus x giganteus Lignin
... of phenolic hydroxyl and aliphatic hydroxyl content ...aliphatic hydroxyl moieties in MxG organosolv lignin decreased with the severity of the treatment while phenolic hydroxyl ...
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Crystal structure of 3 bromo 2 hydroxybenzonitrile
... the phenolic hydroxyl itself is not disordered, and the model has been refined with the help of similarity and advanced rigid bond restraints (Thorn et ...
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Fractionation and characterization of oil palm (Elaeis guineensis) as treated by supercritical water
... Abstract In order to investigate the potential for effi cient utilization of oil palm (Elaeis guineensis), supercritical water treatment (at 380°C and 100 MPa for 8 s) was applied to fractionate extractives-free samples ...
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On the formation of diphenylmethane structures in lignin under Kraft, soda and EMCC pulping conditions
... In our earlier work the phosphorus NMR spectra of solubilized kraft lignin contained, among others, a signal centred around 143.5 ppm (40). On the basis of model compound work and calculations based on the Hammett ...
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Synthesis of lignin based composites of TiO2 for potential application as radical scavengers in sunscreen formulation
... of phenolic hydroxyl group [15]. The phenolic hydroxyl groups act as a proton donor and can stabilize the resulting radicals by substituents and ...as phenolic, ketone and other ...
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Oxidation of HDPE in the Presence of PVC Grafted with Natural Polyphenols (Tannins) as Antioxidant
... DSC analysis and FTIR spectrum refer to that PVC can be chemically modified by reacted it with tannins in basic solution of DMF at 110˚C. This modification leads to appear phenolic hydroxyl groups into PVC ...
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Synthesis of Apocynin Dimer Derivatives Combining L-cysteine and alpha-lipoic Acid
... the phenolic hydroxyl group in motif 2 of JJA-D0 and amino group of cysteine was protected by TBDMS and Boc, ...the phenolic hydroxyl group in motif 1 of JJA-D0 was not protected, no ester ...
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Enzymatic pretreatment of pulp mill effluents prior to decolorization by lime precipitation
... possible reason that laccase caused only limited improvements in color removal efficiency could be an insufficient phenolic hydroxyl content in the various effluents tested, Enzymatic[r] ...
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Preparation of anion-exchange resins from pine sulfuric acid lignin, one of the acid hydrolysis lignins
... C-NMR of reaction products showed that the main product was com- pound 2, with a hydroxymethyl group at the meta position against the phenolic hydroxyl group. Furthermore, increas- ing the sulfuric acid ...
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Structural changes in lignin of tropical woods during digestion by termite, Cryptotermes brevis
... of phenolic hydroxyl groups, unconjugated phenolic hydroxyl groups, and a-carbonyl groups was detected be- tween Björkman lignins from original woods and termite ...aliphatic hydroxyl ...
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Termiticidal activity of wood vinegar, its components and their homologues
... It has become apparent that high termiticidal activity cannot be obtained by a phenolic hydroxyl group alone; it can be obtained, however, by some substituents, [r] ...
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2 Formylthymol oxime
... Thymol is a naturally occurring phenolic monoterpenoid. It possesses an ecological role and shows a broad spectrum of biological activities (Desai & Shah, 2003). In order to enhance the overall biological ...
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Linkage abundance and molecular weight characteristics of technical lignins by attenuated total reflection FTIR spectroscopy combined with multivariate analysis
... For example, partial least squares PLS multivariate regression analysis can be used to predict, with good accuracy, the hydroxyl group content e.g., phenolic, aliphatic, COOH, lignin pur[r] ...
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Some biological activities of Epaltes divaricata L. - an in vitro study
... radicals. Phenolic compounds con- taining free hydrogen have been shown to be largely responsible for antioxidant activity [24], as a result, the phenolic compounds of EDEa may be responsible for the ...
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ANTIOXIDANT ACTIVITY OF HYPERICUM TRIQUETRIFOLIUM TURRA METHANOL EXTRACT
... phenolic anti-oxidant action, and can be strongly correlated with other anti-oxidant properties. Increase in absorbance of the react ion mixture indicated increase in reducing power of the extract. [23,30] The ...
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IN VITRO ANTIOXIDANT AND ANTI INFLAMMATORY PROFILES OF BIOACTIVE FRACTION FROM OPILIA CELTIDIFOLIA (GUILL & PERR ) ENDL EX WALP (OPILIACEAE)
... The hydroxyl radical scavenging activity of leaves fraction was effectual than other ...of hydroxyl radicals which is very toxic to the ...of phenolic group that donate electrons to hydrogen peroxide ...
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Synthesis of Polyhydric Phenolic Phenacyl Ethers
... Phenolic ethers play huge role in medicinal chemistry and some of them are used as adhesives and holt melt. Alkyl phenolic ether prodrugs have been repor ted where coupling with a hydroxymethylimide using ...
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