Relevant bibliographies by topics / Pyrogallol oxidation

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Academic literature on the topic 'Pyrogallol oxidation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Pyrogallol oxidation"

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Mendes, Vanda, Rita Vilaça, Victor de Freitas, Pedro Moradas Ferreira, Nuno Mateus, and Vítor Costa. "Effect of Myricetin, Pyrogallol, and Phloroglucinol on Yeast Resistance to Oxidative Stress." Oxidative Medicine and Cellular Longevity 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/782504.

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The health beneficial effects of dietary polyphenols have been attributed to their intrinsic antioxidant activity, which depends on the structure of the compound and number of hydroxyl groups. In this study, the protective effects of pyrogallol, phloroglucinol, and myricetin on the yeastSaccharomyces cerevisiaewere investigated. Pyrogallol and myricetin, which have a pyrogallol structure in the B ring, increased H2O2resistance associated with a reduction in intracellular oxidation and protein carbonylation, whereas phloroglucinol did not exert protective effects. The acquisition of oxidative stress resistance in cells pretreated with pyrogallol and myricetin was not associated with an induction of endogenous antioxidant defences as assessed by the analysis of superoxide dismutase and catalase activities. However, myricetin, which provided greater stress resistance, prevented H2O2-induced glutathione oxidation. Moreover, myricetin increased the chronological lifespan of yeast lacking the mitochondrial superoxide dismutase (Sod2p), which exhibited a premature aging phenotype and oxidative stress sensitivity. These findings show that the presence of hydroxyl groups in the ortho position of the B ring in pyrogallol and myricetin contributes to the antioxidant protection afforded by these compounds. In addition, myricetin may alleviate aging-induced oxidative stress, particularly when redox homeostasis is compromised due to downregulation of endogenous defences present in mitochondria.
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Sutanto, Susanto, and Nasikin. "Solubility and Antioxidant Potential of a Pyrogallol Derivative for Biodiesel Additive." Molecules 24, no. 13 (July 2, 2019): 2439. http://dx.doi.org/10.3390/molecules24132439.

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Biodiesel is a renewable plant-based fuel as an alternative for fossil diesel fuel which has many advantages. However, its high content of unsaturated fatty acid causes an oxidation instability during storage. Numerous additives have been used and developed to overcome this problem such as the application of phenolic compound-based antioxidants. Pyrogallol is reported to be one of the best phenolic antioxidants for biodiesel. Unfortunately, pyrogallol has a low solubility in oil solution. In this research, pyrogallol solubility is increased by preparing a pyrogallol derivative through a reaction between pyrogallol and methyl linoleate in the presence of radical 2,2-diphenyl-1-picrylhydrazyl (DPPH). The spectrophotometric method was used for solubility test. Antioxidant potential was examined using acid value determination during a four-week storage period as well as the Rancimat test to see its performance under accelerated oxidation conditions. The reaction produced a molecule which has a molecular weight of 418 g/mol, representing pyrogallol derivative which has a new C–O covalent bond with methyl linoleate. The result was confirmed by using nuclear magnetic resonance (1H-NMR, 13C-NMR, and 2D-HMQC) resulting in a molecular structure of methyl (10E,12E)-9-(2,6-dihydroxyphenoxy)octadeca-10,12-dienoate and its isomer methyl (9E,11E)-13-(2,6-dihydroxyphenoxy)octadeca-9,11-dienoate with a yield of 12.86% and selectivity of 21.05% on the basis of pyrogallol. Compared to pyrogallol, tert-butylhydroquinone (TBHQ), and gallic acid, the pyrogallol derivative has the highest solubility and acid value stability in palm oil biodiesel. The Rancimat induction time (IP) result of the pyrogallol derivative is higher than the biodiesel and is above the accelerated oxidation test American Society for Testing and Materials (ASTM) D 6751 standard.
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Mohos, Violetta, Attila Pánovics, Eszter Fliszár-Nyúl, Gabriella Schilli, Csaba Hetényi, Přemysl Mladěnka, Paul W. Needs, Paul A. Kroon, Gábor Pethő, and Miklós Poór. "Inhibitory Effects of Quercetin and Its Human and Microbial Metabolites on Xanthine Oxidase Enzyme." International Journal of Molecular Sciences 20, no. 11 (May 31, 2019): 2681. http://dx.doi.org/10.3390/ijms20112681.

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Quercetin is an abundant flavonoid in nature and is used in several dietary supplements. Although quercetin is extensively metabolized by human enzymes and the colonic microflora, we have only few data regarding the pharmacokinetic interactions of its metabolites. Therefore, we investigated the interaction of human and microbial metabolites of quercetin with the xanthine oxidase enzyme. Inhibitory effects of five conjugates and 23 microbial metabolites were examined with 6-mercaptopurine and xanthine substrates (both at 5 μM), employing allopurinol as a positive control. Quercetin-3′-sulfate, isorhamnetin, tamarixetin, and pyrogallol proved to be strong inhibitors of xanthine oxidase. Sulfate and methyl conjugates were similarly strong inhibitors of both 6-mercaptopurine and xanthine oxidations (IC50 = 0.2–0.7 μM); however, pyrogallol inhibited xanthine oxidation (IC50 = 1.8 μM) with higher potency vs. 6-MP oxidation (IC50 = 10.1 μM). Sulfate and methyl conjugates were approximately ten-fold stronger inhibitors (IC50 = 0.2–0.6 μM) of 6-mercaptopurine oxidation than allopurinol (IC50 = 7.0 μM), and induced more potent inhibition compared to quercetin (IC50 = 1.4 μM). These observations highlight that some quercetin metabolites can exert similar or even a stronger inhibitory effect on xanthine oxidase than the parent compound, which may lead to the development of quercetin–drug interactions (e.g., with 6-mercaptopurin or azathioprine).
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RIAHI, SIAVASH, ABDOLMAJID BAYANDORI MOGHADDAM, MOHAMMAD REZA GANJALI, and PARVIZ NOROUZI. "DETERMINATION OF THE OXIDATION POTENTIALS OF PYROGALLOL AND SOME OF ITS DERIVATIVES: THEORY AND EXPERIMENT." Journal of Theoretical and Computational Chemistry 06, no. 02 (June 2007): 331–40. http://dx.doi.org/10.1142/s0219633607003015.

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The Oxidation potentials of pyrogallol and some of its derivatives in aqueous solutions have been calculated. The calculations have been performed using ab initio molecular orbital calculations (HF), and density functional theory (DFT) with the inclusion of entropic and thermochemical corrections to yield free energies of redox reactions. The polarizable continuum model is used to describe the solvent. It was also obtained experimentally with the aid of an electrochemical technique (cyclic voltammetry). The theoretical and experimental values for the oxidation potential of the studied pyrogallol and some derivatives are in excellent agreement with each other and there is only a discrepancy of 0.025 V and 0.020 V for B3LYP and HF methods, respectively, between experimental and theoretical results. The agreement mutually verifies the accuracy of the experimental method and the validity of the applied mathematical model.
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Li, Yan, Yosuke Matsuo, Yoshinori Saito, and Takashi Tanaka. "Three New Oxidation Products Produced from Epigallocatechin-3-O-gallate and Epicatechin-3-O-gallate." Natural Product Communications 11, no. 2 (February 2016): 1934578X1601100. http://dx.doi.org/10.1177/1934578x1601100214.

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During chemical studies on uncharacterized black tea polyphenols, the enzymatic oxidation of a mixture of epigallocatechin-3- O-gallate (1) and epicatechin-3- O-gallate (2) was examined, and three new dimeric products together with six known catechin dimers were isolated. Two of the new compounds have tricyclo[5.2.2.02,6]undecane and tricyclo[5.2.1.02,6]decane carboxyl structures generated by oxidative coupling between two pyrogallol-B-rings of 1. Another new product was a dimer connected by a C-C bond between the B-ring of 1 and a galloyl group of 2.
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Lee, Jo-Won, Sohee Yoon, Y. Martin Lo, Haohao Wu, Sook-Young Lee, and BoKyung Moon. "Intrinsic polyphenol oxidase-like activity of gold@platinum nanoparticles." RSC Advances 5, no. 78 (2015): 63757–64. http://dx.doi.org/10.1039/c5ra07636f.

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Au@Pt NPs showed PPO mimetic activity over a wider range of pH and temperatures compared to PPO. In the oxidation of all substrates, Au@Pt NPs exhibited higher affinity to the substrates, especially to catechol and pyrogallol, compared with PPO.
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Ong, Hwai Chyuan, M. Mofijur, A. S. Silitonga, D. Gumilang, Fitranto Kusumo, and T. M. I. Mahlia. "Physicochemical Properties of Biodiesel Synthesised from Grape Seed, Philippine Tung, Kesambi, and Palm Oils." Energies 13, no. 6 (March 12, 2020): 1319. http://dx.doi.org/10.3390/en13061319.

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The production of biodiesel using vegetable oil is an effective way to meet growing energy demands, which could potentially reduce the dependency on fossil fuels. The aim of this study was to evaluate grape seed (Vitis vinifera), Philippine tung (Reutealis trisperma), and kesambi (Schleichera oleosa) oils as potential feedstocks for biodiesel production to meet this demand. Firstly, biodiesels from these oils were produced and then their fatty acid methyl ester profiles and physicochemical properties were evaluated and compared with palm biodiesel. The results showed that the biodiesel produced from grape seed oil possessed the highest oxidation stability of 4.62 h. On the other hand, poor oxidation stability was observed for Philippine tung biodiesel at 2.47 h. The poor properties of Philippine tung biodiesel can be attributed to the presence of α-elaeostearic fatty acid. Furthermore, synthetic antioxidants (pyrogallol) and diesel were used to improve the oxidation stability. The 0.2 wt.% concentration of pyrogallol antioxidant could increase the oxidation stability of grape seed biodiesel to 6.24 h, while for kesambi and Philippine tung, biodiesels at higher concentrations of 0.3% and 0.4 wt.%, respectively, were needed to meet the minimum limit of 8 h. The blending of biodiesel with fossil diesel at different ratios can also increase the oxidation stability.
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Medina-Escriche, J., A. Sevillano-Cabeza, M. Martín-Penella, and M. Llobat-Estelles. "Spectrophotometric determination of bromate by the oxidation of Pyrogallol Red." Analyst 110, no. 12 (1985): 1467–71. http://dx.doi.org/10.1039/an9851001467.

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9

Iranpoor, N., N. Maleki, S. Razi, and A. Safavi. "Spectrophotometric determination of vanadium in different oxidation states with pyrogallol." Talanta 39, no. 3 (March 1992): 281–84. http://dx.doi.org/10.1016/0039-9140(92)80033-a.

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10

Guardiola, Francesc, Sandra Garcia-Cruset, Ricard Bou, and Rafael Codony. "Artifactual Oxidation of Cholesterol During the Analysis of Cholesterol Oxidation Products: Protective Effect of Antioxidants." Journal of AOAC INTERNATIONAL 87, no. 2 (March 1, 2004): 493–98. http://dx.doi.org/10.1093/jaoac/87.2.493.

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Abstract To study the influence of the addition of various antioxidants and their combinations on the artifactual oxidation of cholesterol during analysis, 2 factorial experiments were performed in duplicate. In the first experiment, 2 amounts of the following antioxidants were assayed: ethylene-diaminetetraacetic acid (EDTA) disodium salt (0 and 1 mg), pyrogallol (0 and 600 μg), and butylated hydroxytoluene (BHT; 0 and 600 μg); in the second, EDTA disodium salt (0 and 1 mg), ascorbyl palmitate (0 and 600 μg), and BHT (0 and 600 μg). Under low oxidative conditions of dim light, evaporation of solvents at low temperatures, and cold saponification in darkness under nitrogen atmosphere, the addition of antioxidants showed no further protective effect. Furthermore, the presence of ascorbyl palmitate significantly increased the formation of cholesterol- 5β,6β-epoxide, and 7β-hydroxycholesterol.
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Dissertations / Theses on the topic "Pyrogallol oxidation"

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Hrušková, Helena. "Využití moderních analytických metod pro studium vybraných koordinačních sloučenin boru." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-396771.

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This thesis is focused on the study of boron coordination compounds, specifically boron pyrogallol and 2,3-dihydroxynaphthalene ligand complexes. In the introductory part of the work are discussed the properties of boron compounds, their preparation, the possibility of separation by capillary electrophoresis and methods of structural characterization. In the first part of the thesis, the methods of preparation of complexes are discussed and for each complex the optimal yield response is chosen. The resulting products were studied by low resolution mass spectrometry. In the second part of the thesis, structures of complexes, including their modeling in the Gaussian program, were described more precisely. Furthermore, the complexes were characterized by high resolution mass spectrometry. The complexes were also studied by 11 B, 1 H and 1 H COSY NMR and IR spectroscopy. The third part was devoted to the separation of these substances from the mixture after the reaction. CE-UV and CE-MS techniques were used for this purpose. To convert the results, the separation method was developed in ammonium formate buffers that are compatible with both instruments. The equilibration between complexes and ligands was also monitored by CE-UV. A special chapter is the study of pyrogallol autooxidation by UV-VIS and...
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Conference papers on the topic "Pyrogallol oxidation"

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Yusri, Silvya, Hery Sutanto, and Mohammad Nasikin. "Size-Selective Adsorption in Separation of Products from Pyrogallol and Methyl Linoleate Oxidative Coupling Reaction." In 2018 2nd International Conference on Green Energy and Applications (ICGEA). IEEE, 2018. http://dx.doi.org/10.1109/icgea.2018.8356316.

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Naufal, Dio Arveza, Hery Sutanto, Ali Rimbasa Siregar, Anda Lucia, and Mohammad Nasikin. "The synergistic effect of pyrogallol based binary antioxidants in the oxidative stability of palm oil biodiesel." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0013683.

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