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Artículos de revistas sobre el tema "Oxidation"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Griffith, William P., and Maria Suriaatmaja. "Studies on transition-metal nitrido and oxo complexes. Part 20. Oxoruthenates and oxo-osmates in oxidation catalysis; cis-[Os(OH)2O4]2- as a catalytic oxidant for primary amines and for alcohols." Canadian Journal of Chemistry 79, no. 5-6 (2001): 598–606. http://dx.doi.org/10.1139/v00-181.

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cis-[Os(OH)2O4]2 with [Fe(CN)6]3 and other co-oxidants has been studied as a catalytic reagent for the oxidative dehydrogenation of primary aromatic and aliphatic amines to nitriles, the oxidation of primary alcohols to carboxylic acids and of secondary alcohols to ketones. Electronic and Raman spectroscopy have been used to elucidate the nature of the oxoruthenates and oxo-osmates present in a number of reported organic oxidations catalyzed by ruthenium and osmium species.Key words: oxidation catalysis, ruthenium, osmium, amine dehydrogenation, alcohol oxidation.

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2

Francioso, Antonio, Alessia Baseggio Conrado, Carla Blarzino та ін. "One- and Two-Electron Oxidations of β-Amyloid25-35 by Carbonate Radical Anion (CO3•−) and Peroxymonocarbonate (HCO4−): Role of Sulfur in Radical Reactions and Peptide Aggregation". Molecules 25, № 4 (2020): 961. http://dx.doi.org/10.3390/molecules25040961.

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The β-amyloid (Aβ) peptide plays a key role in the pathogenesis of Alzheimer’s disease. The methionine (Met) residue at position 35 in Aβ C-terminal domain is critical for neurotoxicity, aggregation, and free radical formation initiated by the peptide. The role of Met in modulating toxicological properties of Aβ most likely involves an oxidative event at the sulfur atom. We therefore investigated the one- or two-electron oxidation of the Met residue of Aβ25-35 fragment and the effect of such oxidation on the behavior of the peptide. Bicarbonate promotes two-electron oxidations mediated by hydr

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3

Zhao, Rong, Denghu Chang, and Lei Shi. "Recent Advances in Cyclic Diacyl Peroxides: Reactivity and Selectivity Enhancement Brought by the Cyclic Structure." Synthesis 49, no. 15 (2017): 3357–65. http://dx.doi.org/10.1055/s-0036-1588458.

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Preliminarily studies on cyclic diacyl peroxides have shown novel and superior reactivities compared with their acyclic diacyl peroxide counterparts in many reaction types. After summarizing the methods available for the preparation of cyclic diacyl peroxides and describing their structural features, this review brings together an overview of their reactivities with respect to oxidations and decarboxylations, and demonstrates the advantages of reactions with cyclic diacyl peroxides, which include metal-free, additive-free, milder conditions, higher yields and better selectivities.1 Introductio

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4

Silva, D. M. de, and S. D. Aust. "Ferritin and ceruloplasmin in oxidative damage: review and recent findings." Canadian Journal of Physiology and Pharmacology 71, no. 9 (1993): 715–20. http://dx.doi.org/10.1139/y93-107.

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The oxidation of biomolecules such as lipid, protein, and DNA is associated with a variety of toxicities and pathologies. In an all-encompassing definition these oxidative processes have been referred to as "oxidative stress." Although the direct reaction between molecular oxygen and most biomolecules is spin forbidden, this reaction can be efficiently catalyzed by transition metals such as iron and copper. Iron especially has been demonstrated to be a potent catalyst of biological oxidations. This review focuses on the relationship between iron and copper with respect to the copper protein ce

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5

Cryle, Max J., Jeanette E. Stok, and James J. De Voss. "Reactions Catalyzed by Bacterial Cytochromes P450." Australian Journal of Chemistry 56, no. 8 (2003): 749. http://dx.doi.org/10.1071/ch03040.

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The cytochromes P450 are a large family of oxidative haemoproteins that are responsible for a wide variety of oxidative transformations in a variety of organisms. This review focuses upon the reactions catalyzed specifically by bacterial enzymes, which includes aliphatic hydroxylation, alkene epoxidation, aromatic hydroxylation, oxidative phenolic coupling, heteroatom oxidation and dealkylation, and multiple oxidations including C–C bond cleavage. The potential for the practical application of the oxidizing power of these enzymes is briefly discussed.

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6

Lathbury, David, and Andy Wells. "Oxidation and Oxidative Reactions." Organic Process Research & Development 19, no. 11 (2015): 1536. http://dx.doi.org/10.1021/acs.oprd.5b00341.

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7

Wang, Xi, and Yingwei Li. "Nanoporous carbons derived from MOFs as metal-free catalysts for selective aerobic oxidations." Journal of Materials Chemistry A 4, no. 14 (2016): 5247–57. http://dx.doi.org/10.1039/c6ta00324a.

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A new kind of metal-free catalyst comprised of highly graphitized N-doped nanoporous carbons from direct carbonization of metal–organic frameworks (MOFs) turns out to be an excellent metal-free catalyst for a series of liquid-phase oxidation reactions including aerobic oxidations of cyclohexane and toluene as well as oxidative coupling of amines.

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8

Sardarly, А. М. "PHASE COMPOSITION AND OXIDATION DEGREE OF VANADIUM IN CATALYSTS FOR OXIDATIVE DEHYDROGENATION OF PROPANE." Chemical Problems 20, no. 4 (2022): 358–65. http://dx.doi.org/10.32737/2221-8688-2022-3-358-365.

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The phase composition of vanadium and vanadium-antimony-containing samples of γ-Al2O3 and the degree of oxidation of vanadium in them were examined by XRD and EPR methods, respectively. The data of XRD and EPR spectroscopy show the formation of highly dispersed vanadium-oxygen and vanadiumantimony-oxygen structures on the surface of the support. It is shown that the EPR spectra of the studied samples are due to "isolated" vanadium ions with an oxidation state of +4 in nonstoichiometric vanadium-oxygen and vanadium-antimony-oxygen formations with a square pyramid local environment structure wit

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9

Christoffers, Jens, and Mathias S. Wickleder. "Synthesis of Aromatic and Aliphatic Di-, Tri-, and Tetrasulfonic Acids." Synlett 31, no. 10 (2020): 945–52. http://dx.doi.org/10.1055/s-0039-1691745.

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Oligosulfonic acids are promising linker compounds for coordination polymers and metal-organic frameworks, however, compared to their carboxylic acid congeners, often not readily accessible by established synthetic routes. This Account highlights the synthesis of recently developed aromatic and aliphatic di-, tri- and tetrasulfonic acids. While multiple electrophilic sulfonations of aromatic substrates are rather limited, the nucleophilic aromatic substitution including an intramolecular variant, the Newman–Kwart rearrangement, allows the flexible introduction of up to four sulfur-containing m

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10

SIMANDAN, Tiberiu, Jing SUN, and Thomas A. DIX. "Oxidation of DNA bases, deoxyribonucleosides and homopolymers by peroxyl radicals." Biochemical Journal 335, no. 2 (1998): 233–40. http://dx.doi.org/10.1042/bj3350233.

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DNA base oxidation is considered to be a key event associated with disease initiation and progression in humans. Peroxyl radicals (ROO•) are important oxidants found in cells whose ability to react with the DNA bases has not been characterized extensively. In this paper, the products resulting from ROO• oxidation of the DNA bases are determined by gas chromatography/MS in comparison with authentic standards. ROO• radicals oxidize adenine and guanine to their 8-hydroxy derivatives, which are considered biomarkers of hydroxyl radical (HO•) oxidations in cells. ROO• radicals also oxidize adenine

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11

Chen, Chuck T., Marc-Olivier Trépanier, Kathryn E. Hopperton, Anthony F. Domenichiello, Mojgan Masoodi та Richard P. Bazinet. "Inhibiting Mitochondrial β-Oxidation Selectively Reduces Levels of Nonenzymatic Oxidative Polyunsaturated Fatty Acid Metabolites in the Brain". Journal of Cerebral Blood Flow & Metabolism 34, № 3 (2013): 376–79. http://dx.doi.org/10.1038/jcbfm.2013.221.

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Schönfeld and Reiser recently hypothesized that fatty acid β-oxidation is a source of oxidative stress in the brain. To test this hypothesis, we inhibited brain mitochondrial β-oxidation with methyl palmoxirate (MEP) and measured oxidative polyunsaturated fatty acid (PUFA) metabolites in the rat brain. Upon MEP treatment, levels of several nonenzymatic auto-oxidative PUFA metabolites were reduced with few effects on enzymatically derived metabolites. Our finding confirms the hypothesis that reduced fatty acid β-oxidation decreases oxidative stress in the brain and β-oxidation inhibitors may be

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12

Masferrer-Rius, Eduard, and Robertus J. M. Klein Gebbink. "Non-Noble Metal Aromatic Oxidation Catalysis: From Metalloenzymes to Synthetic Complexes." Catalysts 13, no. 4 (2023): 773. http://dx.doi.org/10.3390/catal13040773.

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The development of selective aromatic oxidation catalysts based on non-noble metals has emerged over the last decades, mainly due to the importance of phenol products as intermediates for the generation of pharmaceuticals or functional polymers. In nature, metalloenzymes can perform a wide variety of oxidative processes using molecular oxygen, including arene oxidations. However, the implementation of such enzymes in the chemical industry remains challenging. In this context, chemists have tried to mimic nature and design synthetic non-noble metal catalysts inspired by these enzymes. This revi

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13

Tonda, Rachel, Arlene Lamptey, and Brenda Reid. "PSV-15 Variability in the Oxidative Status of Fats and Oils Used in Livestock Diets in North America." Journal of Animal Science 99, Supplement_1 (2021): 197–98. http://dx.doi.org/10.1093/jas/skab054.322.

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Abstract Lipids are essential energy sources in nearly every animal’s diet. However, lipids used in feed formulations today are highly variable in both composition and susceptibility to oxidation – a major source of decreased lipid quality. Feeding oxidized lipids negatively influences animal health and performance, yet data on the oxidative status of commercially used lipids is limited. Herein, the oxidative stability results of lipid samples submitted to Kemin Customer Laboratory Services (CLS) for analysis since 2018 is summarized. Of the 392 samples evaluated, corn oil (n=122), choice whit

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14

Dyck, Yan Felix Karl, Daniel Rehm, Jan Felix Joseph, et al. "Forced Degradation Testing as Complementary Tool for Biosimilarity Assessment." Bioengineering 6, no. 3 (2019): 62. http://dx.doi.org/10.3390/bioengineering6030062.

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Oxidation of monoclonal antibodies (mAbs) can impact their efficacy and may therefore represent critical quality attributes (CQA) that require evaluation. To complement classical CQA, bevacizumab and infliximab were subjected to oxidative stress by H2O2 for 24, 48, or 72 h to probe their oxidation susceptibility. For investigation, a middle-up approach was used utilizing liquid chromatography hyphenated with mass spectrometry (LC-QTOF-MS). In both mAbs, the Fc/2 subunit was completely oxidized. Additional oxidations were found in the light chain (LC) and in the Fd’ subunit of infliximab, but n

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15

YANO, Yumihiko, and Norio TAMURA. "Oxidations by Oxidation-Active Flavin Mimics." Journal of Synthetic Organic Chemistry, Japan 50, no. 10 (1992): 899–907. http://dx.doi.org/10.5059/yukigoseikyokaishi.50.899.

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16

Wazir, Hazrati, Shyan Yea Chay, Mohammad Zarei, et al. "Effects of Storage Time and Temperature on Lipid Oxidation and Protein Co-Oxidation of Low-Moisture Shredded Meat Products." Antioxidants 8, no. 10 (2019): 486. http://dx.doi.org/10.3390/antiox8100486.

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Studies on the oxidative changes in meat-based, low-moisture, ready to eat foods are complicated due to complex food system and slow lipid-protein oxidative deterioration. The current study evaluates the oxidative changes over six months of storage on shredded beef and chicken products (locally known as serunding) for physicochemical analysis, lipid oxidation (conjugated dienes and malondialdehydes) and protein co-oxidation (soluble protein content, amino acid composition, protein carbonyl, tryptophan loss and Schiff base fluorescence) at 25 °C, 40 °C and 60 °C. The lipid stability of chicken

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17

Uchuskin, Maxim, Igor Trushkov, and Anton Makarov. "Furan Oxidation Reactions in the Total Synthesis of Natural Products." Synthesis 50, no. 16 (2018): 3059–86. http://dx.doi.org/10.1055/s-0037-1610021.

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Recent developments on the transformations of furans under oxidative conditions toward the total synthesis of complex natural compounds are discussed. Reactions and methods are classified according to the type of oxidant used. Comparisons are then made between all the strategies to provide a comprehensive overview. This review covers the most prominent work published from 2011 until 2017.1 Introduction2 Reagents and Methods for Oxidation of the Furan Ring2.1 Singlet Oxygen2.2 Peroxides and Hydroperoxides2.3 Quinones2.4 Halogen-Based Oxidants2.5 Chromium-Based Oxidants3 The Achmatowicz Reaction

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18

Blacken, Grady R., Yi Wang, Jose A. Lopez, and Xiaoyun Fu. "Cysteine 93 of Hemoglobin Beta Chain Is the Major Target of Oxidation During Red Blood Cell Storage." Blood 114, no. 22 (2009): 4040. http://dx.doi.org/10.1182/blood.v114.22.4040.4040.

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Abstract Abstract 4040 Poster Board III-976 Red blood cells (RBC) stored for prolonged time periods under blood banking conditions are known to accumulate irreversible damage that ultimately affects their viability and function. Among the consequences of this RBC storage lesion are enhanced hemolysis and oxidative stress after transfusion. Stored RBCs accumulate reactive oxygen species (ROS) and surface-associated hemichrome, a partially denatured form of oxidized hemoglobin. In this work, we examined whether the ROS created during RBC storage lead to characteristic oxidative modifications to

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19

Li, Yong Zhi, Zeng Wu Zhao, Bao Wei Li, Wen Fei Wu, and Shuo Li. "Oxidation of U71Mn Steel under Pure Oxygen." Advanced Materials Research 562-564 (August 2012): 68–71. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.68.

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Isothermal oxidations of U71Mn steels under pure oxygen, between 1027K and 1473K, are experimentally analyzed in this study. The results showed that Oxidation kinetics at different temperature from 1173K to 1473K are similar: mass increase per unit area as function of oxidation time follows parabolic role. Oxidation rate constants of the steel under pure oxygen, from 1173K to 1473K, keep exponential law as function of oxidation time.

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20

Blair, Megan C., Michael D. Neinast, and Zoltan Arany. "Whole-body metabolic fate of branched-chain amino acids." Biochemical Journal 478, no. 4 (2021): 765–76. http://dx.doi.org/10.1042/bcj20200686.

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Oxidation of branched-chain amino acids (BCAAs) is tightly regulated in mammals. We review here the distribution and regulation of whole-body BCAA oxidation. Phosphorylation and dephosphorylation of the rate-limiting enzyme, branched-chain α-ketoacid dehydrogenase complex directly regulates BCAA oxidation, and various other indirect mechanisms of regulation also exist. Most tissues throughout the body are capable of BCAA oxidation, and the flux of oxidative BCAA disposal in each tissue is influenced by three key factors: 1. tissue-specific preference for BCAA oxidation relative to other fuels,

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21

Grilo, Filipa S., and Selina C. Wang. "Walnut (Juglans regia L.) Volatile Compounds Indicate Kernel and Oil Oxidation." Foods 10, no. 2 (2021): 329. http://dx.doi.org/10.3390/foods10020329.

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Kernel oxidation susceptibility and pellicle darkening are among the biggest concerns regarding walnut quality. Monitoring oxidation is crucial to preserve quality from production to consumption. Chemical oxidation parameters (peroxide value and UV absorbances), fatty acid profile, tocopherols, phenols, and volatiles in ‘Chandler’ and ‘Howard’ kernels were studied at different time points during 28 weeks of storage to evaluate potential oxidation markers. During storage, peroxide value, UV absorbances, and volatiles concentration increased; oxidative stability, phenols, and tocopherols decreas

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22

Mária Nagy, Zoltán Győri, and Mária Borbélyné Varga. "Methods for detention of lipid rancidity." Acta Agraria Debreceniensis, no. 50 (December 16, 2012): 117–20. http://dx.doi.org/10.34101/actaagrar/50/2576.

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There are various methods available for measurement of lipid oxidation in foods.Changes in chemical, physical, or organoleptic properties of fats and oils during oxidation may be monitored to assess the extent of lipid oxidation. However, there is no uniform and standard method for detecting all oxidative changes in all food systems. The available methods to monitor lipid oxidation in foods and biological systems may be divided into two groups. The first group measures primary oxidative changes and the second determines secondary changes that occur in each system.

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23

Yang, Lingwei, Xueren Xiao, Liping Liu, et al. "Dynamic oxidation mechanism of carbon fiber reinforced SiC matrix composite in high-enthalpy and high-speed plasmas." Journal of Advanced Ceramics 11, no. 2 (2022): 365–77. http://dx.doi.org/10.1007/s40145-021-0540-8.

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AbstractThis work employed an inductively coupled plasma wind tunnel to study the dynamic oxidation mechanisms of carbon fiber reinforced SiC matrix composite (Cf/SiC) in high-enthalpy and high-speed plasmas. The results highlighted a transition of passive/active oxidations of SiC at 800–1600 °C and 1–5 kPa. Specially, the active oxidation led to the corrosion of the SiC coating and interruption of the SiO2 growth. The transition borders of active/passive oxidations were thus defined with respect to oxidation temperature and partial pressure of atomic O in the high-enthalpy and high-speed plas

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24

Domínguez, Rubén, Mirian Pateiro, Paulo E. S. Munekata, et al. "Protein Oxidation in Muscle Foods: A Comprehensive Review." Antioxidants 11, no. 1 (2021): 60. http://dx.doi.org/10.3390/antiox11010060.

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Muscle foods and their products are a fundamental part of the human diet. The high protein content found in muscle foods, as well as the high content of essential amino acids, provides an appropriate composition to complete the nutritional requirements of humans. However, due to their special composition, they are susceptible to oxidative degradation. In this sense, proteins are highly susceptible to oxidative reactions. However, in contrast to lipid oxidation, which has been studied in depth for decades, protein oxidation of muscle foods has been investigated much less. Moreover, these reacti

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25

K., S. Sharma, Sharda Kumari (Mrs.), and Kumar Goel Vijender. "Photochemistry of vic-diols in the presence of benzoyl peroxide and N-bromosuccinimide." Journal of Indian Chemical Society Vol. 76, Jul 1999 (1999): 366–67. https://doi.org/10.5281/zenodo.5848856.

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Department of Chemistry, Maharshi Dayanand University, Rohtak-124 001, India <em>Manuscript received 23 December 1998, accepted 9 March 1999</em> Various vicinal diols <em>have </em>been irradiated in the presence of benzoyl peroxide and <em>N</em>-bromosuccinimide. Oxidation products are predominating wherever hydrogens at the carbon carrying hydroxyl groups are available. In the case of tertiary hydroxyl groups, oxidative retrodimerisation products are predominant.

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26

Nencini, Francesca, Elvira Giurranna, Serena Borghi, Niccolò Taddei, Claudia Fiorillo, and Matteo Becatti. "Fibrinogen Oxidation and Thrombosis: Shaping Structure and Function." Antioxidants 14, no. 4 (2025): 390. https://doi.org/10.3390/antiox14040390.

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Fibrinogen, a pivotal plasma glycoprotein, plays an essential role in hemostasis by serving as the precursor to fibrin, which forms the structural framework of blood clots. Beyond coagulation, fibrinogen influences immune responses, inflammation, and tissue repair. Oxidative stress, characterized by an imbalance between reactive oxygen species (ROS) and antioxidants, induces fibrinogen oxidation, significantly altering its structure and function. This narrative review synthesizes findings from in vitro, ex vivo, and clinical studies, emphasizing the impact of fibrinogen oxidation on clot forma

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27

Petersen, J. Claine, and P. Michael Harnsberger. "Asphalt Aging: Dual Oxidation Mechanism and Its Interrelationships with Asphalt Composition and Oxidative Age Hardening." Transportation Research Record: Journal of the Transportation Research Board 1638, no. 1 (1998): 47–55. http://dx.doi.org/10.3141/1638-06.

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The kinetic data and chemistry of asphalt oxidative age hardening suggested a sequential, dual mechanism for asphalt oxidation. The dual mechanism rationalizes conflicts between earlier mechanistic investigations and explains the hyperbolic-like, time-versus-property plots characteristic of asphalt oxidative aging. The oxidation kinetics provide further confirmation of the asphalt microstructural model. It is proposed that the rapid initial oxidation rate of asphalt results from reaction of oxygen with limited amounts of highly reactive hydrocarbons. Final oxidation products of this initial re

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28

Xiao, Ling, Yu Li, Xuan Wang, and Chao Yu. "Study on aging mechanism of special neoprene in hot air." IOP Conference Series: Earth and Environmental Science 1171, no. 1 (2023): 012038. http://dx.doi.org/10.1088/1755-1315/1171/1/012038.

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Abstract The accelerated aging tests of the special neoprene material in hot air were carried in laboratory. The aging mechanism was analyzed by using FTIR, DSC and TG spectra. The results showed that the thermal oxidative aging in air was a self-catalyzed oxidating reaction, the cross-linking reaction firstly in the process of thermo-oxidation, and the degradation reaction occurs at the later stage of aging.

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29

Silva, Raphael S. F., Mauro B. de Amorim, Maria do Carmo F. R. Pinto, Flávio S. Emery, Marília O. F. Goulart, and Antonio V. Pinto. "Chemoselective oxidation of benzophenazines by m-CPBA: n-oxidation vs. oxidative cleavage." Journal of the Brazilian Chemical Society 18, no. 4 (2007): 759–64. http://dx.doi.org/10.1590/s0103-50532007000400014.

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30

Burgoyne, Joseph R., and Philip Eaton. "Contemporary techniques for detecting and identifying proteins susceptible to reversible thiol oxidation." Biochemical Society Transactions 39, no. 5 (2011): 1260–67. http://dx.doi.org/10.1042/bst0391260.

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Elevated protein oxidation is a widely reported hallmark of most major diseases. Historically, this ‘oxidative stress’ has been considered causatively detrimental, as the protein oxidation events were interpreted simply as damage. However, recent advances have changed this antiquated view; sensitive methodology for detecting and identifying proteins susceptible to oxidation has revealed a fundamental role for this modification in physiological cell signalling during health. Reversible protein oxidation that is dynamically coupled with cellular reducing systems allows oxidative protein modifica

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31

Kusuhara, S., M. Ito, T. Sato, et al. "Intracellular GSH of Streptococcus thermophilus shows anti-oxidative activity against low-density lipoprotein oxidation in vitro and in a hyperlipidaemic hamster model." Beneficial Microbes 9, no. 1 (2018): 143–52. http://dx.doi.org/10.3920/bm2017.0065.

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Streptococcus thermophilus YIT 2001 (ST-1), a lactic acid bacterial strain, was shown to have inhibitory effects on the oxidation of low-density lipoprotein (LDL) and the development of aortic fatty lesions in an animal model, and lower the serum levels of malondialdehyde-modified LDL, an oxidative modification product of LDL, in a clinical trial. This study aimed to identify the intracellular active component of ST-1 associated with anti-oxidative activity against LDL oxidation. High-performance liquid chromatography-electrospray ionisation mass spectrometry analysis after fractionation of th

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32

Fruehwirth, Sarah, Sandra Egger, Dennis Kurzbach, et al. "Ingredient-Dependent Extent of Lipid Oxidation in Margarine." Antioxidants 10, no. 1 (2021): 105. http://dx.doi.org/10.3390/antiox10010105.

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This study reports the impact of margarine-representative ingredients on its oxidative stability and green tea extract as a promising antioxidant in margarine. Oil-in-water emulsions received much attention regarding factors that influence their oxidative stability, however, water-in-oil emulsions have only been scarcely investigated. Margarine, a widely consumed water-in-oil emulsion, consists of 80–90% fat and is thermally treated when used for baking. As different types of margarine contain varying additives, their impact on the oxidative stability of margarine during processing is of press

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33

Kanvah, Sriram, and Gary B. Schuster. "Oxidative damage to DNA: Inhibition of guanine damage." Pure and Applied Chemistry 78, no. 12 (2006): 2297–304. http://dx.doi.org/10.1351/pac200678122297.

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One-electron oxidation of DNA results in chemical damage to nucleobases, particularly guanine in multiple G sequences. Oxidation may be triggered by numerous events, including photosensitization. We describe studies of photoinduced oxidations of DNA triggered by irradiation of covalently linked anthraquinone derivatives under various conditions that affect the global structure of the DNA. These structural changes have subtle effects on the result of the one-electron oxidation.

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34

Kuo, C. F., and I. Fridovich. "Free-radical chain oxidation of 2-nitropropane initiated and propagated by superoxide." Biochemical Journal 237, no. 2 (1986): 505–10. http://dx.doi.org/10.1042/bj2370505.

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The superoxide radical O2.-, whether produced by the xanthine/xanthine oxidase reaction or infused as KO2, solubilized by a crown ether in dry dimethyl sulphoxide, initiated a free-radical chain oxidation of anionic 2-nitropropane. Superoxide dismutase, but not catalase, inhibited oxidation of the nitroalkane. Xanthine oxidase suffered a syncatalytic inactivation, during the co-oxidation of 2-nitropropane, which was reversed by dialysis. Cyanide exacerbated this syncatalytic inactivation and rendered it irreversible. The frequently observed oxidations of nitroalkanes by flavoenzymes now need t

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35

Han, Wei, and Binbin Liu. "Iron-Catalyzed Wacker-Type Oxidation." Synlett 29, no. 04 (2018): 383–87. http://dx.doi.org/10.1055/s-0036-1591532.

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Compared with the widespread use of Pd-catalyzed Wacker-type oxidation of olefins, iron catalysis for this transformation is almost virgin territory. Our work on an iron-catalyzed Wacker-type oxidation through reductive activation of dioxygen is discussed here. This novel single-electron-transfer process not only addresses the issues of the Pd-catalyzed two-electron Wacker-type oxidation, but also possesses unprecedented functional-group tolerance and chemoselectivity. Importantly, the catalytic system uses ambient air as the sole oxidant, and it permits late-stage oxidations of complex molecu

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36

Hong, Yiming, Tiantian Fang, Meichao Li, et al. "2,3-Dichloro-5,6-dicyano-1,4-benzoquinone-catalyzed aerobic oxidation reactions via multistep electron transfers with iron(ii) phthalocyanine as an electron-transfer mediator." RSC Advances 6, no. 57 (2016): 51908–13. http://dx.doi.org/10.1039/c6ra08921f.

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37

Domínguez, Rubén, Mirian Pateiro, Mohammed Gagaoua, Francisco J. Barba, Wangang Zhang, and José M. Lorenzo. "A Comprehensive Review on Lipid Oxidation in Meat and Meat Products." Antioxidants 8, no. 10 (2019): 429. http://dx.doi.org/10.3390/antiox8100429.

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Meat and meat products are a fundamental part of the human diet. The protein and vitamin content, as well as essential fatty acids, gives them an appropriate composition to complete the nutritional requirements. However, meat constituents are susceptible to degradation processes. Among them, the most important, after microbial deterioration, are oxidative processes, which affect lipids, pigments, proteins and vitamins. During these reactions a sensory degradation of the product occurs, causing consumer rejection. In addition, there is a nutritional loss that leads to the formation of toxic sub

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Allen, Tara J., and Christopher D. Hardin. "Influence of glycogen storage on vascular smooth muscle metabolism." American Journal of Physiology-Heart and Circulatory Physiology 278, no. 6 (2000): H1993—H2002. http://dx.doi.org/10.1152/ajpheart.2000.278.6.h1993.

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The role of glycogen as an oxidative substrate for vascular smooth muscle (VSM) remains controversial. To elucidate the importance of glycogen as an oxidative substrate and the influence of glycogen flux on VSM substrate selection, we systematically altered glycogen levels and measured metabolism of glucose, acetate, and glycogen. Hog carotid arteries with glycogen contents ranging from 1 to 11 μmol/g were isometrically contracted in physiological salt solution containing 5 mM [1-13C]glucose and 1 mM [1,2-13C]acetate at 37°C for 6 h. [1-13C]glucose, [1,2-13C]acetate, and glycogen oxidation wer

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39

Van Hecke, Thomas, and Stefaan De Smet. "The Influence of Butter and Oils on Oxidative Reactions during In Vitro Gastrointestinal Digestion of Meat and Fish." Foods 10, no. 11 (2021): 2832. http://dx.doi.org/10.3390/foods10112832.

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Oxidative reactions during cooking and gastrointestinal digestion of meat and fish lead to the formation of various lipid- and protein oxidation products, some of which are toxic. In the present study, it was investigated how the addition of 3% butter or oils affect lipid- and protein oxidation during cooking and in vitro digestion of meat (chicken thigh, chicken breast, beef) and fish (mackerel, cod). These muscle foods were selected based on their differences in heme-Fe and PUFA contents, and n-6/n-3 PUFA ratio, and therefore varying potential to form oxidation products during digestion. Wit

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40

Ni, Hong Jun, Lei Chen, De Qin She, and Yin Nan Yuan. "Current Situation of the Study on Oxidative Stability of Biodiesel." Advanced Materials Research 887-888 (February 2014): 484–87. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.484.

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As a high quality alternative of fossil diesel, biodiesel is widely concerned at domestic and abroad for its environmentally friendly and renewable. Oxidation stability is one of the important properties of biodiesel, which is also one of the quality criteria in storing and using. The oxidative mechanism and the influencing factors of Oxidation stability, oxidation stabilitys evaluation methods and the application of biodiesel antioxidants were reviewed. Then the direction of oxidation stability is put forward.

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41

Pan, F., X. Wang, B. Wen, et al. "Development of walnut oil and almond oil blends for improvements in nutritional and oxidative stability." Grasas y Aceites 71, no. 4 (2020): 381. http://dx.doi.org/10.3989/gya.0920192.

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For the increase in oxidative stability and phytonutrient contents of walnut oil (WO), 5, 10, 20 and 30% blends with almond oil (AO) were prepared. The fatty acid compositions and the micronutrients of the oil samples such as tocopherol, phytosterol and squalene were measured by GC-MS and HPLC. It was found that the proportions of PUFAs/SFAs in blended oils with high AO contents were lowered, and the blends contained higher levels of tocopherols, phytosterols and squalene than those of pure WO. The 60 °C oven accelerated oxidation test was used to determine the oxidative stability of the blend

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42

Waldi, Muhamad, Helmi Bagas Samudra, Ahmad Maulana Arkan Leksana, Djoko Hadi Prajitno, and Haris Tjahaya. "Cyclic Oxidation Behavior of HVOF Thermally Sprayed WC Cermet Based on AISI 1045 Steel." Majalah Ilmiah Pengkajian Industri 16, no. 2 (2022): 73–80. http://dx.doi.org/10.29122/mipi.v16i2.5311.

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Thermal spray coating technology High-Velocity Oxygen Fuel (HVOF) has become one of solution for metal protect and parts recondition that work in critical environments such as oxidative, erosive, and corrosive. One of the thermal spray coatings (TSC) application has been carried out to improve the oxidation resistance of the Induce Draft Fan (IDF) as a part on coal fired steam power plant unit. Cermet WC10Co4Cr and WC17Co are intended to sustain the AISI 1045 steel substrate against the oxidative environment. In this works, the cyclic oxidation at a temperature 500oC were conducted to reveal t

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43

Yang, Moua, and Roy L. Silverstein. "Targeting Cysteine Oxidation in Thrombotic Disorders." Antioxidants 13, no. 1 (2024): 83. http://dx.doi.org/10.3390/antiox13010083.

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Oxidative stress increases the risk for clinically significant thrombotic events, yet the mechanisms by which oxidants become prothrombotic are unclear. In this review, we provide an overview of cysteine reactivity and oxidation. We then highlight recent findings on cysteine oxidation events in oxidative stress-related thrombosis. Special emphasis is on the signaling pathway induced by a platelet membrane protein, CD36, in dyslipidemia, and by protein disulfide isomerase (PDI), a member of the thiol oxidoreductase family of proteins. Antioxidative and chemical biology approaches to target cyst

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44

Williamson, Peter R., Kazumasa Wakamatsu, and Shosuke Ito. "Melanin Biosynthesis in Cryptococcus neoformans." Journal of Bacteriology 180, no. 6 (1998): 1570–72. http://dx.doi.org/10.1128/jb.180.6.1570-1572.1998.

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ABSTRACT Pigment production by Cryptococcus neoformans is virulence associated. Dopamine- and 3,4-dihydroxyphenylalanine–melanin products were identified after acidic permanganate oxidation, alkaline hydrogen peroxide oxidation, or hydrolysis with hydriodic acid. These data provide direct chemical evidence for the formation of eumelanin polymers by catecholamine oxidation by laccase alone followed by oxidative coupling of dihydroxyindole.

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45

He, Zhongqi, Sunghyun Nam, and K. Thomas Klasson. "Oxidative Stability of Cottonseed Butter Products under Accelerated Storage Conditions." Molecules 28, no. 4 (2023): 1599. http://dx.doi.org/10.3390/molecules28041599.

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Cottonseed is a natural product of cotton (Gossypium spp.) crops. This work evaluated the oxidative stability of cottonseed butters through accelerated autoxidation by storage at 60 °C for 25 days. Three oxidative stability parameter values (peroxide value, p-anisidine value, and total oxidation value) were monitored over the storage time. These chemical measurements revealed that the storage stability of the butter products was dominated by primary oxidation of lipid (oil) components, while the secondary oxidation levels were relatively unchanged over the storage time. An analysis of the toco

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46

Pandey, Kanti Bhooshan, Mohd Murtaza Mehdi, Pawan Kumar Maurya, and Syed Ibrahim Rizvi. "Plasma Protein Oxidation and Its Correlation with Antioxidant Potential During Human Aging." Disease Markers 29, no. 1 (2010): 31–36. http://dx.doi.org/10.1155/2010/964630.

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Previous studies have indicated that the main molecular characteristic of aging is the progressive accumulation of oxidative damages in cellular macromolecules. Proteins are one of the main molecular targets of age-related oxidative stress, which have been observed during aging process in cellular systems. Reactive oxygen species (ROS) can lead to oxidation of amino acid side chains, formation of protein-protein cross-linkages, and oxidation of the peptide backbones. In the present study, we report the age-dependent oxidative alterations in biomarkers of plasma protein oxidation: protein carbo

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47

Lozano-Picazo, Carmen María, and Francisco Fernández-Belda. "Especies reactivas de oxígeno y su implicación en Biomedicina." Anales de Veterinaria de Murcia 34 (December 16, 2020): 17–26. http://dx.doi.org/10.6018/analesvet.332621.

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Las especies reactivas de oxígeno (ROS) actúan como regulador intracelular cuando se generan de forma controlada en puntos concretos de la célula. Modifican la función de proteínas mediante la oxidación reversible de cisteínas. Hay quinasas y fosfatasas de proteínas, factores de transcripción y canales iónicos que están regulados por ROS. Estrés oxidativo y daño celular aparecen cuando los mecanismos antioxidantes de protección son incapaces de mantener bajo el nivel intracelular de ROS. En estas condiciones, ROS inducen pérdida de viabilidad celular en patologías degenerativas de corazón y ce

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48

Collins, A. R., and E. Horváthová. "Oxidative DNA damage, antioxidants and DNA repair: applications of the comet assay." Biochemical Society Transactions 29, no. 2 (2001): 337–40. http://dx.doi.org/10.1042/bst0290337.

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Estimates of background levels of oxidative base damage in human white blood cells vary enormously, from 300 down to 0.4 molecules of 8-oxoguanine per 106 guanines. An EC-funded Concerted Action, the European Standards Committee on Oxidative DNA Damage, is currently attempting to resolve the discrepancy and to agree a realistic estimate of basal endogenous oxidation. Oxidation of lymphocyte DNA is a useful marker of oxidative stress, and this can be decreased by supplementation with pure antioxidants or with foods rich in antioxidants. The steady-state level of DNA oxidation is ultimately cont

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49

Li, Gui-Yang, and J. L. Koenig. "A Review of Rubber Oxidation." Rubber Chemistry and Technology 78, no. 2 (2005): 355–90. http://dx.doi.org/10.5254/1.3547888.

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Abstract The aging of rubber caused by oxidative degradation leads to the deterioration in the physical and mechanical properties of vulcanized rubbers. In an effort to improve the oxidative stability of rubbers and elastomers, considerable amount of work has been carried out over the past 50 years (especially in the most recent 5 years) in order to understand degradation modes and effects in rubber due to the action of oxygen and ozone in the air. Different mechanisms have been proposed to interpret the experimental data relative to the oxidation of rubber. The diffusion limited theory has be

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50

Li, Gui-Yang, and J. L. Koenig. "A Review of Rubber Oxidation." Rubber Chemistry and Technology 78, no. 3 (2005): 355–90. http://dx.doi.org/10.5254/1.3547889.

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Abstract The aging of rubber caused by oxidative degradation leads to the deterioration in the physical and mechanical properties of vulcanized rubbers. In an effort to improve the oxidative stability of rubbers and elastomers, considerable amount of work has been carried out over the past 50 years (especially in the most recent 5 years) in order to understand degradation modes and effects in rubber due to the action of oxygen and ozone in the air. Different mechanisms have been proposed to interpret the experimental data relative to the oxidation of rubber. The diffusion limited theory has be

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