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Articoli di riviste sul tema "Peroxides"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 luglio 2024

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1

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 (June 12, 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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2

Lubeigt, X., F. Flies, M. J. Bourgeois, E. Montaudon, and B. Maillard. "Déplacements homolytiques intramoléculaires. 19. Stéréochimie de la décomposition induite de peroxydes insaturés conduisant à la formation d'hétérocycles à trois et quatre chaînons." Canadian Journal of Chemistry 69, no. 8 (August 1, 1991): 1320–25. http://dx.doi.org/10.1139/v91-196.

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Homolytic decomposition induced by addition of dichloromethyl radicals to β- and γ-unsaturated peroxides having a substituent on the chain linking the unsaturation and the peroxide function was studied. The stereochemistry of the heterocycles produced was determined by I3C NMR and the stereoselectivity of intramolecular homolytic substitution on the peroxidic bond discussed. Key words: unsaturated peroxides, homolytic intramolecular substitutions, radical additions, oxygenated heterocycles.

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3

Ajima, A., SG Cao, K. Takahashi, A. Matsushima, Y. Saito, and Y. Inada. "An attempt to determine lipid peroxides with polyethylene glycol‐modified hemin." Biotechnology and Applied Biochemistry 9, no. 1 (February 1987): 53–57. http://dx.doi.org/10.1111/j.1470-8744.1987.tb00462.x.

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Hemin, having two carboxyl groups, was coupled with alpha‐(3‐aminopropyl)‐omega‐methoxypoly(oxyethylene) through the acid‐amide bond formed with carbodiimide. The modified hemin catalyzed the peroxidase reaction in 1,1,1‐trichloroethane using benzoyl peroxide or peroxides in unsaturated fatty acids as the hydrogen acceptor and leuco crystal violet as the hydrogen donor. A basic study on quantitative microanalysis of the lipid peroxides was attempted.

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4

Veal, Elizabeth A., Lewis E. Tomalin, Brian A. Morgan, and Alison M. Day. "The fission yeast Schizosaccharomyces pombe as a model to understand how peroxiredoxins influence cell responses to hydrogen peroxide." Biochemical Society Transactions 42, no. 4 (August 1, 2014): 909–16. http://dx.doi.org/10.1042/bst20140059.

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As a more selectively reactive oxygen species, H2O2 (hydrogen peroxide) has been co-opted as a signalling molecule, but high levels can still lead to lethal amounts of cell damage. 2-Cys Prxs (peroxiredoxins) are ubiquitous thioredoxin peroxidases which utilize reversibly oxidized catalytic cysteine residues to reduce peroxides. As such, Prxs potentially make an important contribution to the repertoire of cell defences against oxidative damage. Although the abundance of eukaryotic 2-Cys Prxs suggests an important role in maintaining cell redox, the surprising sensitivity of their thioredoxin p

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5

Missall, Tricia A., Jocie F. Cherry-Harris, and Jennifer K. Lodge. "Two glutathione peroxidases in the fungal pathogen Cryptococcus neoformans are expressed in the presence of specific substrates." Microbiology 151, no. 8 (August 1, 2005): 2573–81. http://dx.doi.org/10.1099/mic.0.28132-0.

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Glutathione peroxidases catalyse the reduction of peroxides by reduced glutathione. To determine if these enzymes are important for resistance to oxidative stress and evasion of the innate immune system by the fungal pathogen Cryptococcus neoformans, two glutathione peroxidase homologues, which share 38 % identity, were identified and investigated. In this study, these peroxidases, Gpx1 and Gpx2, their localization, their contribution to total glutathione peroxidase activity, and their importance to the oxidative and nitrosative stress resistance of C. neoformans are described. It is shown tha

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6

Gutowicz, Marzena. "Antioxidant and detoxycative mechanisms in central nervous system." Postępy Higieny i Medycyny Doświadczalnej 74 (February 19, 2020): 1–11. http://dx.doi.org/10.5604/01.3001.0013.8548.

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Since the brain contains a large amount of polyunsaturated fatty acids, consumes up to 20% of oxygen used by the whole body and exhibits low antioxidants activity, it seems to be especially vulnerable to oxidative stress. The most important antioxidant enzymes are superoxide dismutase (SOD), which catalyze the dismutation of superoxide anion to hydrogen peroxide, catalase (CAT), which converts toxic hydrogen peroxide to water and oxygen, and glutathione peroxidase (Se-GSHPx), which reduces hydrogen peroxide and organic peroxides with glutathione as the cofactor. Among other detoxifying enzymes

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7

Iturbe-Ormaetxe, Iñaki, Manuel A. Matamoros, Maria C. Rubio, David A. Dalton, and Manuel Becana. "The Antioxidants of Legume Nodule Mitochondria." Molecular Plant-Microbe Interactions® 14, no. 10 (October 2001): 1189–96. http://dx.doi.org/10.1094/mpmi.2001.14.10.1189.

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The mitochondria of legume root nodules are critical to sustain the energy-intensive process of nitrogen fixation. They also generate reactive oxygen species at high rates and thus require the protection of antioxidant enzymes and metabolites. We show here that highly purified mitochondria from bean nodules (Phaseolus vulgaris L. cv. Contender × Rhizobium leguminosarum bv. phaseoli strain 3622) contain ascorbate peroxidase primarily in the inner membrane (with lesser amounts detected occasionally in the matrix), guaiacol peroxidases in the outer membrane and matrix, and manganese superoxide di

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8

Naskar, Kinsuk, and Jacques W. M. Noordermeer. "Dynamically Vulcanized PP/EPDM Blends: Multifunctional Peroxides as Crosslinking Agents — Part I." Rubber Chemistry and Technology 77, no. 5 (November 1, 2004): 955–71. http://dx.doi.org/10.5254/1.3547862.

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Abstract Thermoplastic vulcanizates (TPVs) or dynamic vulcanizates are a special class of thermoplastic elastomers, produced by mixing and crosslinking of a rubber and a thermoplastic polymer simultaneously. In a previous study, it was demonstrated that the use of dicumyl peroxide in combination with triallyl cyanurate as crosslinking agents provides a good overall balance of physical properties of PP/EPDM TPVs. Commonly used peroxides like dicumyl peroxide generally produce volatile decomposition products, which sometimes provide a typical smell or show a blooming effect. In this paper multif

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9

Brenot, Audrey, Katherine Y. King, Blythe Janowiak, Owen Griffith, and Michael G. Caparon. "Contribution of Glutathione Peroxidase to the Virulence of Streptococcus pyogenes." Infection and Immunity 72, no. 1 (January 2004): 408–13. http://dx.doi.org/10.1128/iai.72.1.408-413.2004.

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ABSTRACT Glutathione peroxidases are widespread among eukaryotic organisms and function as a major defense against hydrogen peroxide and organic peroxides. However, glutathione peroxidases are not well studied among prokaryotic organisms and have not previously been shown to promote bacterial virulence. Recently, a gene with homology to glutathione peroxidase was shown to contribute to the antioxidant defenses of Streptococcus pyogenes (group A streptococcus). Since this bacterium causes numerous suppurative diseases that require it to thrive in highly inflamed tissue, it was of interest to de

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10

Fleychuk, Roman, Lidiya Vuytsyk, Ananiy Kohut, and Orest Hevus. "Synthesis of Epoxyperoxides and Peroxide Derivatives of -D-Galactopyranose Based Thereon." Chemistry & Chemical Technology 14, no. 4 (December 15, 2020): 439–47. http://dx.doi.org/10.23939/chcht14.04.439.

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New epoxide-containing peroxides have been synthesized via the interaction between epichlorohydrin and ditertiary -hydroxyalkyl peroxides. The effect of reaction conditions on both the yield and composition of the reaction products has been established. Through the reactions of either the synthesized epoxide-containing peroxides with 1,2;3,4-di-O-isopropylidene--D-galactopyranose or 6-O-glycidyl-1,2;3,4-di-O-isopropylidene--D-galactopyranose with the -hydroxyalkyl peroxides, new peroxide derivatives with ditertiary and primary-tertiary peroxide groups have been synthesized successfully. Th

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11

Mertes, P., L. Pfaffenberger, J. Dommen, M. Kalberer, and U. Baltensperger. "Development of a sensitive long pathlength absorbance photometer to quantify peroxides in aerosol particles (Peroxide-LOPAP)." Atmospheric Measurement Techniques Discussions 5, no. 1 (February 13, 2012): 1431–57. http://dx.doi.org/10.5194/amtd-5-1431-2012.

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Abstract. A new off-line instrument to quantify peroxides in aerosol particles using iodometry in long pathlength absorption spectroscopy has been developed and is called peroxide long pathlength absorbance photometer (Peroxide-LOPAP). The new analytical setup features important technical innovations compared to hitherto published iodometric peroxide measurements. Firstly, the extraction, chemical conversion and measurement of the aerosol samples are performed in a closed oxygen-free (∼1 ppb) environment. Secondly, a 50-cm optical detection cell is used for an increased photometric sensitivity

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12

Mertes, P., L. Pfaffenberger, J. Dommen, M. Kalberer, and U. Baltensperger. "Development of a sensitive long path absorption photometer to quantify peroxides in aerosol particles (Peroxide-LOPAP)." Atmospheric Measurement Techniques 5, no. 10 (October 2, 2012): 2339–48. http://dx.doi.org/10.5194/amt-5-2339-2012.

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Abstract. A new off-line instrument to quantify peroxides in aerosol particles using iodometry in long path absorption spectroscopy has been developed and is called peroxide long path absorption photometer (Peroxide-LOPAP). The new analytical setup features important technical innovations compared to hitherto published iodometric peroxide measurements. Firstly, the extraction, chemical conversion and measurement of the aerosol samples are performed in a closed oxygen-free (~ 1 ppb) environment. Secondly, a 50-cm optical detection cell is used for an increased photometric sensitivity. The limit

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13

Broden, Nicole J., Sarah Flury, Alyssa N. King, Braden W. Schroeder, Gabrielle Dierker Coe, and Melinda J. Faulkner. "Insights into the Function of a Second, Nonclassical Ahp Peroxidase, AhpA, in Oxidative Stress Resistance in Bacillus subtilis." Journal of Bacteriology 198, no. 7 (January 19, 2016): 1044–57. http://dx.doi.org/10.1128/jb.00679-15.

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ABSTRACTOrganisms growing aerobically generate reactive oxygen-containing molecules, such as hydrogen peroxide (H2O2). These reactive oxygen molecules damage enzymes and DNA and may even cause cell death. In response,Bacillus subtilisproduces at least nine potential peroxide-scavenging enzymes, two of which appear to be the primary enzymes responsible for detoxifying peroxides during vegetative growth: a catalase (encoded bykatA) and an alkylhydroperoxide reductase (Ahp, encoded byahpC). AhpC uses two redox-active cysteine residues to reduce peroxides to nontoxic molecules. A specialized thior

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14

Clark, Donald E. "Peroxides and peroxide-forming compounds." Chemical Health and Safety 8, no. 5 (September 2001): 12–22. http://dx.doi.org/10.1016/s1074-9098(01)00247-7.

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15

Wang, Yin, Zhongming Chen, Qinqin Wu, Hao Liang, Liubin Huang, Huan Li, Keding Lu, et al. "Observation of atmospheric peroxides during Wangdu Campaign 2014 at a rural site in the North China Plain." Atmospheric Chemistry and Physics 16, no. 17 (September 6, 2016): 10985–1000. http://dx.doi.org/10.5194/acp-16-10985-2016.

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Abstract. Measurements of atmospheric peroxides were made during Wangdu Campaign 2014 at Wangdu, a rural site in the North China Plain (NCP) in summer 2014. The predominant peroxides were detected to be hydrogen peroxide (H2O2), methyl hydroperoxide (MHP) and peroxyacetic acid (PAA). The observed H2O2 reached up to 11.3 ppbv, which was the highest value compared with previous observations in China at summer time. A box model simulation based on the Master Chemical Mechanism and constrained by the simultaneous observations of physical parameters and chemical species was performed to explore the

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16

Laborie, Sophie, Jean-Claude Lavoie, Marjolain Pineault, and Philippe Chessex. "Contribution of Multivitamins, Air, and Light in the Generation of Peroxides in Adult and Neonatal Parenteral Nutrition Solutions." Annals of Pharmacotherapy 34, no. 4 (April 2000): 440–45. http://dx.doi.org/10.1345/aph.19182.

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OBJECTIVE: To compare the concentrations of peroxides between adult and neonatal total parenteral nutrition (TPN) solutions in response to protection against inducers of peroxidation such as multivitamins and exposure to light or air. METHODS: Peroxide concentrations were measured in freshly prepared adult and neonatal solutions of fat-free TPN in four settings: with or without an air inlet, and protected or unprotected from ambient light. An oxygen washout was performed by exposing a fat-free neonatal TPN solution to a continuous flow of nitrogen. RESULTS: Globally, light was the main inducer

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17

Jacob, Peter, Bernhard Wehling, Wieland Hill, and Dieter Klockow. "Feasibility Study of Raman Spectroscopy as a Tool to Investigate the Liquid-Phase Chemistry of Aliphatic Organic Peroxides." Applied Spectroscopy 51, no. 1 (January 1997): 74–80. http://dx.doi.org/10.1366/0003702971938795.

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The described investigations are focused on peroxides occurring as products in atmospheric chemical processes, namely, hydrogen peroxide, methylhydroperoxide, hydroxymethylhydroperoxide, bis-(hydroxymethyl)peroxide, 1-hydroxyethylhydroperoxide, bis-(hydroxyethyl)peroxide, and hydroxymethylmethylperoxide. The compounds are identified and determined through the position and intensity of their characteristic O–O stretching bands in the range between 767 and 878 cm−1. Time-resolved Raman spectroscopy of peroxide solutions permits the in situ investigation of pathways and kinetics of reactions betw

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18

Gaetani, GF, AM Ferraris, M. Rolfo, R. Mangerini, S. Arena, and HN Kirkman. "Predominant role of catalase in the disposal of hydrogen peroxide within human erythrocytes." Blood 87, no. 4 (February 15, 1996): 1595–99. http://dx.doi.org/10.1182/blood.v87.4.1595.bloodjournal8741595.

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Purified enzymes were mixed to form a cell-free system that simulated the conditions for removal of hydrogen peroxide within human erythrocytes. Human glutathione peroxidase disposed of hydrogen peroxide (H2O2) at a rate that was only 17% of the rate at which human catalase simultaneously removed hydrogen peroxide. The relative rates observed were in agreement with the relative rates predicted from the kinetic constants of the two enzymes. These results confirm two earlier studies on intact erythrocytes, which refuted the notion that glutathione peroxidase is the primary enzyme for removal of

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19

Mano, T., R. Sinohara, Y. Sawai, N. Oda, Y. Nishida, T. Mokuno, K. Asano, et al. "Changes in lipid peroxidation and free radical scavengers in the brain of hyper- and hypothyroid aged rats." Journal of Endocrinology 147, no. 2 (November 1995): 361–65. http://dx.doi.org/10.1677/joe.0.1470361.

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Abstract To determine how lipid peroxides and free radical scavengers are changed in the brain of hyper- or hypothyroid rats, we examined the behavior of lipid peroxide and free radical scavengers in the cerebral cortex of aged (1·5 years old) rats that had been made hyper- or hypothyroid by the administration of thyroxine or methimazol for 4 weeks. Concentrations of catalase, Mn-superoxide dismutase (SOD) and glutathione peroxidase (GSH-PX) were increased in hyperthyroid rats compared with euthyroid rats. Concentrations of total SOD, Cu,Zn-SOD and GSH-PX were increased but that of Mn-SOD was

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20

Wang, Shunyao, Tengyu Liu, Jinmyung Jang, Jonathan P. D. Abbatt, and Arthur W. H. Chan. "Heterogeneous interactions between SO<sub>2</sub> and organic peroxides in submicron aerosol." Atmospheric Chemistry and Physics 21, no. 9 (May 4, 2021): 6647–61. http://dx.doi.org/10.5194/acp-21-6647-2021.

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Abstract. Atmospheric models often underestimate particulate sulfate, a major component in ambient aerosol, suggesting missing sulfate formation mechanisms in the models. Heterogeneous reactions between SO2 and aerosol play an important role in particulate sulfate formation and its physicochemical evolution. Here we study the reactive uptake kinetics of SO2 onto aerosol containing organic peroxides. We present chamber studies of SO2 reactive uptake performed under different relative humidity (RH), particulate peroxide contents, peroxide types, and aerosol acidities. Using different model organ

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Dutka, Volodymyr, Olena Aksimentyeva, Nataliya Oschapovska, Yaroslav Kovalskyi, and Halyna Halechko. "Adsorption and Decomposition of Peroxides on the Surfaces of Dispersed Oxides Fe2O3, Cr2O3 and V2O5." Colloids and Interfaces 3, no. 1 (January 17, 2019): 13. http://dx.doi.org/10.3390/colloids3010013.

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The adsorption of peroxides on dispersed oxides Fe2O3, Cr2O3 and V2O5 was studied. It is shown that the adsorption of peroxides is described by the Langmuir equation. The adsorption of benzoyl peroxide grows within Fe2O3<Cr2O3<V2O5. Adsorption-desorption equilibrium constants (K) for Cr2O3 and V2O5 are the same, but for Fe2O3 this value is 6 times higher. The decomposition of peroxides is observed in the solution and on the surface of adsorbents. The effective activation energy (E) of the thermal decomposition of peroxides in the studied systems is in the range of 80–140 kJ/mol. The acti

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Atack, John M., Philippa Harvey, Michael A. Jones, and David J. Kelly. "The Campylobacter jejuni Thiol Peroxidases Tpx and Bcp Both Contribute to Aerotolerance and Peroxide-Mediated Stress Resistance but Have Distinct Substrate Specificities." Journal of Bacteriology 190, no. 15 (May 30, 2008): 5279–90. http://dx.doi.org/10.1128/jb.00100-08.

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ABSTRACT The microaerophilic food-borne pathogen Campylobacter jejuni experiences variable oxygen concentrations during its life cycle, especially during transitions between the external environment and the avian or mammalian gut. Single knockout mutations in either one of two related thiol peroxidase genes, tpx and bcp, resulted in normal microaerobic growth (10% [vol/vol] oxygen) but poorer growth than that of the wild type under high-aeration conditions (21% [vol/vol] oxygen). However, a tpx/bcp double mutant had a severe microaerobic growth defect and did not grow at high aeration in shake

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Yaremenko, Ivan A., Vera A. Vil’, Dmitry V. Demchuk, and Alexander O. Terent’ev. "Rearrangements of organic peroxides and related processes." Beilstein Journal of Organic Chemistry 12 (August 3, 2016): 1647–748. http://dx.doi.org/10.3762/bjoc.12.162.

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This review is the first to collate and summarize main data on named and unnamed rearrangement reactions of peroxides. It should be noted, that in the chemistry of peroxides two types of processes are considered under the term rearrangements. These are conventional rearrangements occurring with the retention of the molecular weight and transformations of one of the peroxide moieties after O–O-bond cleavage. Detailed information about the Baeyer−Villiger, Criegee, Hock, Kornblum−DeLaMare, Dakin, Elbs, Schenck, Smith, Wieland, and Story reactions is given. Unnamed rearrangements of organic perox

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Bourgeois, Marie-Josèphe, Marianne Vialemaringe, Monique Campagnole, and Evelyne Montaudon. "Réaction compétitive de la substitution homolytique intramoléculaire : décomposition de peroxydes allyliques dans le thioglycolate de méthyle." Canadian Journal of Chemistry 79, no. 3 (March 1, 2001): 257–62. http://dx.doi.org/10.1139/v01-024.

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The decomposition of allylic peroxides in methyl thioglycolate always leads to both epoxide and adduct peroxide. According to the nature of the allylic chain, either epoxide or peroxide is the predominant product, if not the only one. It is the first example where the hydrogen transfer is as fast as the intramolecular homolytic substitution. The influence of different factors upon the competition is studied.Key words: allylic peroxides, epoxides, intramolecular homolytic substitution, transfer.

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Li, H., Z. M. Chen, L. B. Huang, and D. Huang. "Organic peroxides gas-particle partitioning and rapid heterogeneous decomposition on secondary organic aerosol." Atmospheric Chemistry and Physics Discussions 15, no. 20 (October 20, 2015): 28133–65. http://dx.doi.org/10.5194/acpd-15-28133-2015.

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Abstract. Organic peroxides, important species in the atmosphere, will promote secondary organic aerosols (SOA) aging, affect HOx radicals cycling, and cause adverse health effects. However, the formation, gas-particle partitioning, and evolution of organic peroxides are extremely complicated and still unclear. In this study, we investigate in the laboratory the production and gas-particle partitioning of peroxides from the ozonolysis of α-pinene, which is one of the major biogenic volatile organic compounds in the atmosphere and is an important precursor for SOA at a global scale. We have det

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Li, Huan, Zhongming Chen, Liubin Huang, and Dao Huang. "Organic peroxides' gas-particle partitioning and rapid heterogeneous decomposition on secondary organic aerosol." Atmospheric Chemistry and Physics 16, no. 3 (February 17, 2016): 1837–48. http://dx.doi.org/10.5194/acp-16-1837-2016.

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Abstract. Organic peroxides, important species in the atmosphere, promote secondary organic aerosol (SOA) aging, affect HOx radicals cycling, and cause adverse health effects. However, the formation, gas-particle partitioning, and evolution of organic peroxides are complicated and still unclear. In this study, we investigated in the laboratory the production and gas-particle partitioning of peroxides from the ozonolysis of α-pinene, which is one of the major biogenic volatile organic compounds in the atmosphere and an important precursor for SOA at a global scale. We have determined the molar

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Lin, Shuqiong, Behnam Ashrafi, Kurtis Laqua, Keun Su Kim, and Benoit Simard. "Covalent derivatization of boron nitride nanotubes with peroxides and their application in polycarbonate composites." New Journal of Chemistry 41, no. 15 (2017): 7571–77. http://dx.doi.org/10.1039/c7nj00193b.

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WILKINSON, Shane R., David J. MEYER, and John M. KELLY. "Biochemical characterization of a trypanosome enzyme with glutathione-dependent peroxidase activity." Biochemical Journal 352, no. 3 (December 8, 2000): 755–61. http://dx.doi.org/10.1042/bj3520755.

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In most eukaryotes, glutathione-dependent peroxidases play a key role in the metabolism of peroxides. Numerous studies have reported that trypanosomatids lack this activity. Here we show that this is not the case, at least for the American trypanosome Trypanosoma cruzi. We have isolated a single-copy gene from T. cruzi with the potential to encode an 18kDa enzyme, the sequence of which has highest similarity with glutathione peroxidases from plants. A recombinant form of the protein was purified following expression in Escherichia coli. The enzyme was shown to have peroxidase activity in the p

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Bhowmick, Debasish, and Govindasamy Mugesh. "Insights into the catalytic mechanism of synthetic glutathione peroxidase mimetics." Organic & Biomolecular Chemistry 13, no. 41 (2015): 10262–72. http://dx.doi.org/10.1039/c5ob01665g.

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This review focuses on the variation of the catalytic mechanisms of synthetic glutathione peroxidase (GPx) mimics depending on their structures and reactivities towards thiols and peroxides. Compounds of different categories follow a characteristic mechanism for the reduction of peroxides.

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Liu, Wenqiu, Xuejun Liu, David Knaebel, Linda Luck, and Yuzhou Li. "Synthesis and Antibacterial Evaluation of Novel Water-Soluble Organic Peroxides." Antimicrobial Agents and Chemotherapy 42, no. 4 (April 1, 1998): 911–15. http://dx.doi.org/10.1128/aac.42.4.911.

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ABSTRACT A set of new water-soluble organic peroxides has been synthesized and evaluated for in vitro antibacterial activity as part of an effort to develop new antibacterial agents for the treatment of acne vulgaris. The water solubility of these new dialkyl peroxides and peroxyesters was achieved by incorporating either a quaternary ammonium group or a polyethylene glycol moiety. These peroxides are effective against both gram-positive and gram-negative bacteria and have a prolonged activity compared to that of benzoyl peroxide and other peroxide-type antiseptic agents. Among them 4-[[(tert-

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Chessex, Philippe, Jean‐Claude Lavoie, Sophie Laborie, and Thérèse Rouleau. "Parenteral Multivitamin Supplementation Induces Both Oxidant and Antioxidant Responses in the Liver of Newborn Guinea Pigs." Journal of Pediatric Gastroenterology and Nutrition 32, no. 3 (March 2001): 316–21. http://dx.doi.org/10.1002/j.1536-4801.2001.tb07275.x.

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ABSTRACTBackgroundThe multivitamin solution is a major component of photo‐induced generation of peroxides in parenteral nutrition. The aim of this study was to determine whether the parenteral multivitamin preparation induces in the liver a peroxide‐induced oxidant challenge or an antioxidant protection associated with the antiradical components of the solution.MethodsNewborn guinea pigs were infused with dextrose supplemented with peroxides (250 μmol/L H2O2 or 350 μmol/L tert‐butylhydroperoxide) or with a multivitamin preparation (MVP, 1% vol/vol). After 4 days, total glutathione and a free r

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Terent'ev, Alexander O., Dmitry A. Borisov, Vera A. Vil’, and Valery M. Dembitsky. "Synthesis of five- and six-membered cyclic organic peroxides: Key transformations into peroxide ring-retaining products." Beilstein Journal of Organic Chemistry 10 (January 8, 2014): 34–114. http://dx.doi.org/10.3762/bjoc.10.6.

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The present review describes the current status of synthetic five and six-membered cyclic peroxides such as 1,2-dioxolanes, 1,2,4-trioxolanes (ozonides), 1,2-dioxanes, 1,2-dioxenes, 1,2,4-trioxanes, and 1,2,4,5-tetraoxanes. The literature from 2000 onwards is surveyed to provide an update on synthesis of cyclic peroxides. The indicated period of time is, on the whole, characterized by the development of new efficient and scale-up methods for the preparation of these cyclic compounds. It was shown that cyclic peroxides remain unchanged throughout the course of a wide range of fundamental organi

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Huang, D., Z. M. Chen, Y. Zhao, and H. Liang. "Newly observed peroxides and the water effect on the formation and removal of hydroxyalkyl hydroperoxides in the ozonolysis of isoprene." Atmospheric Chemistry and Physics 13, no. 11 (June 12, 2013): 5671–83. http://dx.doi.org/10.5194/acp-13-5671-2013.

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Abstract. The ozonolysis of alkenes is considered to be an important source of atmospheric peroxides, which serve as oxidants, reservoirs of HOx radicals, and components of secondary organic aerosols (SOAs). Recent laboratory investigations of this reaction identified hydrogen peroxide (H2O2) and hydroxymethyl hydroperoxide (HMHP) in ozonolysis of isoprene. Although larger hydroxyalkyl hydroperoxides (HAHPs) were also expected, their presence is not currently supported by experimental evidence. In the present study, we investigated the formation of peroxides in the gas phase ozonolysis of isop

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34

Hill, Stephen, Wesley Box, and Robert A. DiSilvestro. "Moderate Intensity Resistance Exercise, Plus or Minus Soy Intake: Effects on Serum Lipid Peroxides in Young Adult Males." International Journal of Sport Nutrition and Exercise Metabolism 14, no. 2 (April 2004): 125–32. http://dx.doi.org/10.1123/ijsnem.14.2.125.

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Lipid peroxides can be both a product and an initiator of oxidant stress. Conceivably, exercise can either increase concentrations of lipid peroxides (by causing oxidant stress), or decrease them (by accelerating peroxide breakdown). The net effect could depend on exercise intensity and nutritional intake of antioxidants. The present study examined the response of serum lipid peroxides to the combination of moderate intensity, weight resistance exercise plus intake of soy protein, a source of antioxidant phytochemicals. Recreationally trained, young adult men (N = 18) consumed soy protein or a

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35

Abran, D., D. R. Varma, and S. Chemtob. "Increased thromboxane-mediated contractions of retinal vessels of newborn pigs to peroxides." American Journal of Physiology-Heart and Circulatory Physiology 268, no. 2 (February 1, 1995): H628—H632. http://dx.doi.org/10.1152/ajpheart.1995.268.2.h628.

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The vasomotor effects of three peroxides (H2O2, cumene hydroperoxide, and t-butyl hydroperoxide) on the retinal vasculature, as well as the role of thromboxane in these effects, were studied using time-frame photography of isolated eyecup preparations from newborn and adult pigs. All three peroxides caused constriction of retinal arteries and veins, and these effects were greater in the newborn than in the adult. The cyclooxygenase inhibitor indomethacin, the thromboxane synthase blocker CGS-13080, and the thromboxane receptor blockers GR-32191B and L-670,596 inhibited the peroxide-induced vas

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36

Furletov, Aleksei, Vladimir Apyari, Alexey Garshev, and Stanislava Dmitrienko. "A Comparative Study on the Oxidation of Label-Free Silver Triangular Nanoplates by Peroxides: Main Effects and Sensing Applications." Sensors 20, no. 17 (August 27, 2020): 4832. http://dx.doi.org/10.3390/s20174832.

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Nowadays, analytical systems based on silver triangular nanoplates (AgTNPs) have been shown as good prospects for chemical sensing. However, they still remain relatively poorly studied as colorimetric probes for sensing various classes of compounds. This study shows that these nanoparticles are capable of being oxidized by peroxides, including both hydrogen peroxide and its organic derivatives. The oxidation was found to result in a decrease in the AgTNPs’ local surface plasmon resonance band intensity at 620 nm. This was proposed for peroxide-sensitive spectrophotometric determination. Five p

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37

Huang, D., Z. M. Chen, Y. Zhao, and H. Liang. "Newly observed peroxides and the water effect on the formation and removal of hydroxyalkyl hydroperoxides in the ozonolysis of isoprene." Atmospheric Chemistry and Physics Discussions 13, no. 2 (February 25, 2013): 5279–314. http://dx.doi.org/10.5194/acpd-13-5279-2013.

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Abstract (sommario):

Abstract. The ozonolysis of alkenes is considered to be an important source of atmospheric peroxides, which serve as oxidants, reservoirs of HOx radicals, and components of secondary organic aerosols (SOAs). Recent laboratory investigations of this reaction identified hydrogen peroxide (H2O2) and hydroxymethyl hydroperoxide (HMHP). Although larger hydroxyalkyl hydroperoxides (HAHPs) were also expected, their presence is not currently supported by experimental evidence. In the present study, we investigated the formation of peroxides in the gas phase ozonolysis of isoprene at various relative h

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38

Naskar, K., and J. W. M. Noordermeer. "Dynamically Vulcanized PP/EPDM Blends: Effects of Different Types of Peroxides on the Properties." Rubber Chemistry and Technology 76, no. 4 (September 1, 2003): 1001–18. http://dx.doi.org/10.5254/1.3547766.

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Abstract (sommario):

Abstract Thermoplastic vulcanizates (TPVs) or dynamic vulcanizates are thermoplastic elastomers produced by simultaneous mixing and crosslinking of a rubber and a thermoplastic. The effects of different types of peroxides as curing agents on the properties of PP/EPDM TPVs were investigated at a fixed blend ratio. The mechanical properties change significantly with the chemical nature of the peroxides, the extent of crosslinking of EPDM and the extent of degradation of PP. Three main parameters have been identified governing the final mechanical properties of TPVs: the solubility parameter of a

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39

Saccoccia, Fulvio, Francesco Angelucci, Giovanna Boumis, Gianni Desiato, Adriana E. Miele, and Andrea Bellelli. "Selenocysteine robustness versus cysteine versatility: a hypothesis on the evolution of the moonlighting behaviour of peroxiredoxins." Biochemical Society Transactions 42, no. 6 (November 17, 2014): 1768–72. http://dx.doi.org/10.1042/bst20140212.

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Abstract (sommario):

Peroxiredoxins (Prxs) and glutathione peroxidases (Gpxs) provide the majority of peroxides reducing activity in the cytoplasm. Both are peroxidases but differences in the chemical mechanism of reduction of oxidative agents, as well as in the reactivity of the catalytically active residues, confer peculiar features on them. Ultimately, Gpx should be regarded as an efficient peroxides scavenger having a high-reactive selenocysteine (Sec) residue. Prx, by having a low pKa cysteine, is less efficient than Gpx in reduction of peroxides under physiological conditions, but the chemistry of the sulfur

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40

Arp, Fabian F., Shin Hye Ahn, Nattamai Bhuvanesh, and Janet Blümel. "Selective synthesis and stabilization of peroxides via phosphine oxides." New Journal of Chemistry 43, no. 44 (2019): 17174–81. http://dx.doi.org/10.1039/c9nj04858h.

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41

Johnson, Robert M., Gerard Goyette, Yaddanapudi Ravindranath, and Ye-Shih Ho. "Red cells from glutathione peroxidase-1–deficient mice have nearly normal defenses against exogenous peroxides." Blood 96, no. 5 (September 1, 2000): 1985–88. http://dx.doi.org/10.1182/blood.v96.5.1985.

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Abstract (sommario):

Abstract The role of glutathione peroxidase in red cell anti-oxidant defense was examined using erythrocytes from mice with a genetically engineered disruption of the glutathione peroxidase-1 (GSHPx-1) gene. Because GSHPx-1 is the sole glutathione peroxidase in the erythrocyte, all red cell GSH peroxidase activity was eliminated. Oxidation of hemoglobin and membrane lipids, using the cis-parinaric acid assay, was determined during oxidant challenge from cumene hydroperoxide and H2O2. No difference was detected between wild-type red cells and GSHPx-1–deficient cells, even at high H2O2 exposures

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42

Johnson, Robert M., Gerard Goyette, Yaddanapudi Ravindranath, and Ye-Shih Ho. "Red cells from glutathione peroxidase-1–deficient mice have nearly normal defenses against exogenous peroxides." Blood 96, no. 5 (September 1, 2000): 1985–88. http://dx.doi.org/10.1182/blood.v96.5.1985.h8001985_1985_1988.

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Abstract (sommario):

The role of glutathione peroxidase in red cell anti-oxidant defense was examined using erythrocytes from mice with a genetically engineered disruption of the glutathione peroxidase-1 (GSHPx-1) gene. Because GSHPx-1 is the sole glutathione peroxidase in the erythrocyte, all red cell GSH peroxidase activity was eliminated. Oxidation of hemoglobin and membrane lipids, using the cis-parinaric acid assay, was determined during oxidant challenge from cumene hydroperoxide and H2O2. No difference was detected between wild-type red cells and GSHPx-1–deficient cells, even at high H2O2 exposures. Thus, G

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43

Opsenica, Dejan, and Bogdan Solaja. "Antimalarial peroxides." Journal of the Serbian Chemical Society 74, no. 11 (2009): 1155–93. http://dx.doi.org/10.2298/jsc0911155o.

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Abstract (sommario):

The problem of endemic malaria continues unabated globally. Malaria affects 40 % of the global population, causing an estimated annual mortality of 1.5-2.7 million people. The World Health Organization (WHO) estimates that 90 % of these deaths occur in sub-Saharan Africa among infants under the age of five. While a vaccine against malaria continues to be elusive, chemotherapy remains the most viable alternative towards treatment of the disease. During last years, the situation has become urgent in many ways, but mainly because of the development of chloroquine-resistant (CQR) strains of Plasmo

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44

Shahnaj, Sharifun, Rimpy Chowhan, Potshangbam Meetei, Pushpa Kakchingtabam, Khundrakpam Herojit Singh, Laishram Rajendrakumar Singh, Potshangbam Nongdam, Aron Fisher, and Hamidur Rahaman. "Hyperoxidation of Peroxiredoxin 6 Induces Alteration from Dimeric to Oligomeric State." Antioxidants 8, no. 2 (February 2, 2019): 33. http://dx.doi.org/10.3390/antiox8020033.

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Abstract (sommario):

Peroxiredoxins(Prdx), the family of non-selenium glutathione peroxidases, are important antioxidant enzymes that defend our system from the toxic reactive oxygen species (ROS). They are thiol-based peroxidases that utilize self-oxidation of their peroxidatic cysteine (Cp) group to reduce peroxides and peroxidized biomolecules. However, because of its high affinity for hydrogen peroxide this peroxidatic cysteine moiety is extremely susceptible to hyperoxidation, forming peroxidase inactive sulfinic acid (Cys-SO2H) and sulfonic acid (Cys-SO3H) derivatives. With the exception of peroxiredoxin 6 (

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45

Foglia, Thomas A., Leonard S. Silbert, and Peter D. Vail. "Peroxides." Journal of Chromatography A 637, no. 2 (May 1993): 157–65. http://dx.doi.org/10.1016/0021-9673(93)83208-a.

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46

Chung, Chun-Hui, Tsung-yong Ma, Shin-yuan Fen, and Hin-chung Wong. "Activities of Alkyl Hydroperoxide Reductase Subunits C1 and C2 of Vibrio parahaemolyticus against Different Peroxides." Applied and Environmental Microbiology 80, no. 23 (September 19, 2014): 7398–404. http://dx.doi.org/10.1128/aem.02701-14.

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Abstract (sommario):

ABSTRACTAlkyl hydroperoxide reductase subunit C gene (ahpC) functions were characterized inVibrio parahaemolyticus, a commonly occurring marine food-borne enteropathogenic bacterium. TwoahpCgenes,ahpC1(VPA1683) andahpC2(VP0580), encoded putative two-cysteine peroxiredoxins, which are highly similar to the homologous proteins ofVibrio vulnificus. The responses of deletion mutants ofahpCgenes to various peroxides were compared with and without gene complementation and at different incubation temperatures. The growth of theahpC1mutant andahpC1 ahpC2double mutant in liquid medium was significantly

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47

Burkhart, Craig G., Cynthia Butcher, Craig N. Burkhart, and Paul Lehmann. "Effects of Benzoyl Peroxide on Lipogenesis in Sebaceous Glands Using an Animal Model." Journal of Cutaneous Medicine and Surgery 4, no. 3 (July 2000): 138–41. http://dx.doi.org/10.1177/120347540000400305.

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Abstract (sommario):

Background: Benzoyl peroxide is the most widely used topical agent for acne since the 1960s. Concomitant treatment of benzoyl peroxide with oral, or topical antibiotics diminishes the multiplication of antibiotic-resistant strains of Propionibacteria acnes. Besides being antibacterial, the chemical also functions as a peeling agent, has comedolytic activity, reduces free fatty acid levels, and is touted to be sebosuppressive. Objective: The purpose was to determine the ability of topically applied benzoyl peroxide to suppress lipogenesis of the sebaceous glands. Methods: The data were obtained

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48

Sakamoto, Toshio, Victoria B. Delgaizo, and Donald A. Bryant. "Growth on Urea Can Trigger Death and Peroxidation of the Cyanobacterium Synechococcus sp. Strain PCC 7002." Applied and Environmental Microbiology 64, no. 7 (July 1, 1998): 2361–66. http://dx.doi.org/10.1128/aem.64.7.2361-2366.1998.

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ABSTRACT Laboratory conditions have been identified that cause the rapid death of cultures of cyanobacteria producing urease. Once the death phase had initiated in the stationary growth phase, cells were rapidly bleached of all pigmentation. Null mutations in the ureCgene, encoding the alpha subunit of urease, were constructed, and these mutants were no longer sensitive to growth in the presence of urea. High levels of peroxides, including lipid peroxides, were detected in the bleaching cells. Exogenously added polyunsaturated fatty acids triggered a similar death response. Vitamin E suppresse

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49

Schweizer, Ulrich, Jazmin Chiu, and Josef Köhrle. "Peroxides and Peroxide-Degrading Enzymes in the Thyroid." Antioxidants & Redox Signaling 10, no. 9 (September 2008): 1577–92. http://dx.doi.org/10.1089/ars.2008.2054.

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50

van der Westhuyzen, Christiaan W., Richard K. Haynes, Jenny-Lee Panayides, Ian Wiid, and Christopher J. Parkinson. "Anti-Mycobacterial Peroxides: A New Class of Agents for Development Against Tuberculosis." Medicinal Chemistry 16, no. 3 (April 17, 2020): 392–402. http://dx.doi.org/10.2174/1573406415666190430143535.

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Abstract (sommario):

Background: With few exceptions, existing tuberculosis drugs were developed many years ago and resistance profiles have emerged. This has created a need for new drugs with discrete modes of action. There is evidence that tuberculosis (like other bacteria) is susceptible to oxidative pressure and this has yet to be properly utilised as a therapeutic approach in a manner similar to that which has proven highly successful in malaria therapy. Objective: To develop an alternative approach to the incorporation of bacterial siderophores that results in the creation of antitubercular peroxidic leads f

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