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Journal articles on the topic 'Polyols – Synthèse'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Mishra, Rajesh, Robert Seckler, and Rajiv Bhat. "Efficient Refolding of Aggregation-prone Citrate Synthase by Polyol Osmolytes." Journal of Biological Chemistry 280, no. 16 (2005): 15553–60. http://dx.doi.org/10.1074/jbc.m410947200.

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Efficient refolding of proteins and prevention of their aggregation during folding are of vital importance in recombinant protein production and in finding cures for several diseases. We have used citrate synthase (CS) as a model to understand the mechanism of aggregation during refolding and its prevention using several known structure-stabilizing cosolvent additives of the polyol series. Interestingly, no parallel correlation between the folding effect and the general stabilizing effect exerted by polyols was observed. Although increasing concentrations of polyols increased protein stability

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2

Silva, Simone Adriane, Sônia Faria Zawadzki, Ronilson Vasconcelos Barbosa, and Luiz Pereira Ramos. "Epoxidized corn oil polyol-based composites polyurethane flexible foams, preparation, and characterization." Ciência e Natura 41 (November 14, 2019): e44. http://dx.doi.org/10.5902/2179460x39155.

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Corn oil is a renewable resource useful for the preparation of polyols used in syntheses of polyurethane. The goal was to synthesize composites flexible foams from corn oil polyol obtained by epoxidation and 4,4’ – methylenebis (phenyl isocyanate) and evaluate their properties. It was used as filler inorganic clay (from up 2 to 5% of silica fume, montmorillonite, and bauxite). The samples were analyzed by DSC, TG, compressive properties and SEM analyses. On DSC analysis was observed the negative temperature of the glass transition for all the samples, and thermally stable up to 200°C. The comp

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3

Roming, Marcus, and Claus Feldmann. "Polyol-vermittelte Synthese von CaF2 und CaF2:Ce,Tb-Nanopartikeln." Zeitschrift für anorganische und allgemeine Chemie 632, no. 12-13 (2006): 2093. http://dx.doi.org/10.1002/zaac.200670034.

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4

Bender, Matthias, Henrik Mouritsen, and Jens Christoffers. "A robust synthesis of 7,8-didemethyl-8-hydroxy-5-deazariboflavin." Beilstein Journal of Organic Chemistry 12 (May 6, 2016): 912–17. http://dx.doi.org/10.3762/bjoc.12.89.

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The biosynthetic precursor of redox cofactor F420, 7,8-didemethyl-8-hydroxy-5-deazariboflavin, was prepared in four steps from 6-chlorouracil, 2-chloro-4-hydroxybenzaldehyde and bis-isopropylidene protected D-ribose. The latter aldehyde was transformed to the corresponding protected ribitylamine via the oxime, which was submitted to reduction with LiAlH4. Key advantage compared to previous syntheses is the utilization of a polyol-protective group which allowed the chromatographic purification of a key-intermediate product providing the target compound with high purity.

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Mensah, M. B., J. A. M. Awudza, and P. O'Brien. "Castor oil: a suitable green source of capping agent for nanoparticle syntheses and facile surface functionalization." Royal Society Open Science 5, no. 8 (2018): 180824. http://dx.doi.org/10.1098/rsos.180824.

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Castor oil (CO) is an inedible vegetable oil (VO) that has been employed extensively as a bioresource material for the synthesis of biodegradable polymers, cosmetics, lubricants, biofuels, coatings and adhesives. It is used in medicine, pharmaceuticals and biorefineries, due to its versatile chemistry. However, there has been less focus on CO as an alternative to toxic and expensive solvents, and capping/stabilizing agents routinely used in nanoparticle syntheses. It provides a richer chemistry than edible VOs as a solvent for green syntheses of nanoparticles. CO, being the only rich source of

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6

Münchau, S., and Hk Müller-Buschbaum. "Synthese und Kristallstruktur einer mit dem Johillerit verwandten Verbindung CdCu1,5Mg1,5Pb0,5O12 / Synthesis and Crystal Structure of a Johillerite Related Compound CdCu1,5Mg1,5Pb0,5O12." Zeitschrift für Naturforschung B 50, no. 8 (1995): 1158–62. http://dx.doi.org/10.1515/znb-1995-0805.

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Single crystals of CdCu1.5Mg1.5Pb0.5V3O12 have been prepared in closed steel tubes using V2O5 as a flux. The orange crystals show monoclinic symmetry, space group C62h-C2/c, a = 12.417(5), b = 12.983(6), c = 6.911(3) Å , β = 113.02(1)°, Z = 4. CdCu1.5Mg1.5Pb0.5V3O12 reveals a relationship to the Johillerite type, but it is characterized by an additional point position for cadmium, situated between the square planar CuO4 polygons of the Johillerite structure.

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7

Borges, Nuno, Luís G. Gonçalves, Marta V. Rodrigues, et al. "Biosynthetic Pathways of Inositol and Glycerol Phosphodiesters Used by the Hyperthermophile Archaeoglobus fulgidus in Stress Adaptation." Journal of Bacteriology 188, no. 23 (2006): 8128–35. http://dx.doi.org/10.1128/jb.01129-06.

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ABSTRACT Archaeoglobus fulgidus accumulates di-myo-inositol phosphate (DIP) and diglycerol phosphate (DGP) in response to heat and osmotic stresses, respectively, and the level of glycero-phospho-myo-inositol (GPI) increases primarily when the two stresses are combined. In this work, the pathways for the biosynthesis of these three compatible solutes were established based on the detection of the relevant enzymatic activities and characterization of the intermediate metabolites by nuclear magnetic resonance analysis. The synthesis of DIP proceeds from glucose-6-phosphate via four steps: (i) gl

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8

Toth, Erika, Anita Racz, Janos Toth, et al. "Contribution of polyol pathway to arteriolar dysfunction in hyperglycemia. Role of oxidative stress, reduced NO, and enhanced PGH2/TXA2 mediation." American Journal of Physiology-Heart and Circulatory Physiology 293, no. 5 (2007): H3096—H3104. http://dx.doi.org/10.1152/ajpheart.01335.2006.

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Hyperglycemia increases glucose metabolism via the polyol pathway, which results in elevations of intracellular sorbitol concentration. Thus we hypothesized that elevated level of sorbitol contributes to the development of hyperglycemia-induced dysfunction of microvessels. In isolated, pressurized (80 mmHg) rat gracilis muscle arterioles (∼150 μm), high glucose treatment (25 mM) induced reduction in flow-dependent dilation (from maximum of 39 ± 2% to 15 ± 1%), which was significantly mitigated by an aldose reductase inhibitor, zopolrestat (maximum 27 ± 2%). Increasing doses of sorbitol (10−10–

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9

Jäger, Volker, Wolfgang Frey, Yaser Bathich, et al. "2-Isoxazolinium Salts and 3-Isoxazolines: Exploratory Chemistry and Uses for the Synthesis of Branched Amino Polyols and Amino Acids." Zeitschrift für Naturforschung B 65, no. 7 (2010): 821–32. http://dx.doi.org/10.1515/znb-2010-0708.

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2-Isoxazolines represent a well known class of heterocycles, readily accessible in particular by 1,3-dipolar cycloaddition of nitrile oxides to alkenes. 2-Isoxazolines are easily transformed into 2- isoxazolinium salts by N-methylation, and further into 3-isoxazolines by deprotonation. In contrast to the parent system, less is known concerning the chemistry of the derived classes, and potential applications in synthesis. - 2-Isoxazolinium salts, due to their iminium part, are prone to the attack of nucleophiles, and examples for this, addition of hydride (reduction) and C-nucleophiles like met

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10

Brautaset, Trygve, Håvard Sletta, Kristin F. Degnes, et al. "New Nystatin-Related Antifungal Polyene Macrolides with Altered Polyol Region Generated via Biosynthetic Engineering of Streptomyces noursei." Applied and Environmental Microbiology 77, no. 18 (2011): 6636–43. http://dx.doi.org/10.1128/aem.05780-11.

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ABSTRACTPolyene macrolide antibiotics, including nystatin and amphotericin B, possess fungicidal activity and are being used as antifungal agents to treat both superficial and invasive fungal infections. Due to their toxicity, however, their clinical applications are relatively limited, and new-generation polyene macrolides with an improved therapeutic index are highly desirable. We subjected the polyol region of the heptaene nystatin analogue S44HP to biosynthetic engineering designed to remove and introduce hydroxyl groups in the C-9-C-10 region. This modification strategy involved inactivat

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11

Ruffo, Antonia, Maria Cristina Mozzati, Benedetta Albini, Pietro Galinetto, and Marcella Bini. "Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties." Journal of Materials Science: Materials in Electronics 31, no. 20 (2020): 18263–77. http://dx.doi.org/10.1007/s10854-020-04374-8.

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AbstractGdFeO3 perovskite attracted large interest in different fields thanks to peculiar magnetic and optical properties that are further tunable by means of doping processes and achievable on both Gd and Fe sites or by properly choosing the synthesis routes. In this paper, nanometric GdFeO3 compounds, undoped and doped with diamagnetic Ca2+ and Mg2+ ions, were synthesized by microwave assisted, sol–gel, and polyol syntheses and characterized by X-ray diffraction, showing solid solutions formation. Raman spectroscopy allowed us to confirm, from peak enlargements, the Ca and Mg substitution on

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12

Carpentier, B., A. Masse, E. Lavergne, and C. Sannier. "BENCHMARKING OF CONVOLUTIONAL NEURAL NETWORK APPROACHES FOR VEGETATION LAND COVER MAPPING." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (June 28, 2021): 915–22. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-915-2021.

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Abstract. Satellite Image Time Series (SITS) are becoming available at high spatial, spectral and temporal resolutions across the globe by the latest remote sensing sensors. These series of images can be highly valuable when exploited by classification systems to produce frequently updated and accurate land cover maps. The richness of spectral, spatial and temporal features in SITS is a promising source of data for developing better classification algorithms. However, machine learning methods such as Random Forests (RF), despite their fruitful application to SITS to produce land cover maps, ar

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13

Haridas, Meera, Carolin Bisterfeld, Le Min Chen, et al. "Discovery and Engineering of an Aldehyde Tolerant 2-deoxy-D-ribose 5-phosphate Aldolase (DERA) from Pectobacterium atrosepticum." Catalysts 10, no. 8 (2020): 883. http://dx.doi.org/10.3390/catal10080883.

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DERA (2-Deoxy-D-ribose 5-phosphate aldolase) is the only known aldolase that accepts two aldehyde substrates, which makes it an attractive catalyst for the synthesis of a chiral polyol motif that is present in several pharmaceuticals, such as atorvastatin and pravastatin. However, inactivation of the enzyme in the presence of aldehydes hinders its practical application. Whole cells of Pectobacterium atrosepticum were reported to exhibit good tolerance toward acetaldehyde and to afford 2-deoxyribose 5-phosphate with good yields. The DERA gene (PaDERA) was identified, and both the wild-type and

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14

Kafle, D., N. Islam, B. Aryal, P. Adhikary, and Neelina Singh. "Inflammation and Oxidative Stress via Persistent Hyperglycemia in Progression of Diabetic Nephropathy in Type 2 Diabetes Mellitus." Journal of Chitwan Medical College 3, no. 1 (2013): 1–4. http://dx.doi.org/10.3126/jcmc.v3i1.8456.

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Diabetic nephropathy is a major microvascular complication of diabetes, representing the leading cause of end stage renal disease in the world, and a major cause of morbidity and mortality in type 2 diabetic subjects. In the kidney, a number of pathways that generate reactive oxygen species (ROS) such as glycolysis, specific defects in the polyol pathway, uncoupling of nitric oxide synthase, xanthine oxidase, NAD (P) H oxidase, and advanced glycation have been identified as potentially major contributors to the pathogenesis of diabetic kidney disease. Changes in oxidative stress biomarkers, in

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15

Escobar-Gutiérrez, A. J., B. Zipperlin, F. Carbonne, A. Moing, and J. P. Gaudillére. "Photosynthesis, carbon partitioning and metabolite content during drought stress in peach seedlings." Functional Plant Biology 25, no. 2 (1998): 197. http://dx.doi.org/10.1071/pp97121.

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Photosynthesis, metabolic carbon partitioning and the contribution of sorbitol to the osmotic potential of mature peach (Prunus persica (L.) Batsch) leaves and phloem sap were examined in plants undergoing two levels of a short term drought stress. The relationship between osmotic potential at full turgor and water potential showed that neither mild nor severe drought stress induced a significant active osmotic adjustment in mature leaves. The osmotic potential of leaves at full turgor was -1.9 MPa; sorbitol was the major organic component (20%). Leaf sucrose and starch contents were significa

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16

Umemoto, Tomio, Masatoshi Kuroki, Hiroto Ueba, Masanobu Kawakami, Hideo Fujita, and Shin-ichi Momomura. "Abstract 169: Impaired Shear Stress-induced Endothelial Nitric Oxide Production in High Glucose Condition is Restored by Inhibiton via NADPH Consumption by Polyol Pathway Activation." Arteriosclerosis, Thrombosis, and Vascular Biology 35, suppl_1 (2015). http://dx.doi.org/10.1161/atvb.35.suppl_1.169.

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Endothelial dysfunction leading to cardiovascular disease risk involves a decrease in nitric oxide (NO) production. In physiological conditions shear stress is a potent stimulation of endothelium-derived NO production and flow mediated NO production is regulated by the activation of endothelial NO synthase (eNOS). In endothelial cells, eNOS, aldose reductase (AR), a rate limiting enzyme of polyol pathway, and glutathione reductase (GR) share a NADPH as an obligate cofactor. In diabetec condition intracellular polyol pathway is activated and this may decrease shear stress-induced endothelial NO

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17

Patel, Jalpa, Dorothy Farrell, Ivan P. Parkin, and Quentin A. Pankhurst. "Particle Size and Oxidation in CoNi Nanoparticles." MRS Proceedings 877 (2005). http://dx.doi.org/10.1557/proc-877-s5.8.

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AbstractCobalt nickel nanoparticles with an oxide shell were prepared by polyol reduction syntheses with varying heating rates, reflux times, surfactants, and reagent concentrations. Differences in particle formation temperature, as evidenced by the reaction medium changing color from violet to black, the UV-Vis absorption spectra of aliquots of reaction media extracted throughout the synthesis reaction, and the colloidal stability of the particle dispersions were observed when the surfactant was changed between otherwise identical reactions. These changes in the reaction kinetics, and therefo

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