602 results match your criteria reactive anhydride

Toughening and thermal characteristics of plasticized polylactide and poly(butylene adipate-co-terephthalate) blend films: Influence of compatibilization.

Int J Biol Macromol 2021 Apr 28;183:346-357. Epub 2021 Apr 28.

Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Petrochemical and Materials Technology, Bangkok 10330, Thailand.

Bio-based polylactide (PLA) derived from fermented corn starch was blended with poly(butylene adipate-co-terephthalate) (PBAT) and triethyl citrate (TEC) plasticizer using a twin screw extruder. PLA-grafted-maleic anhydride (PLA-g-MA) synthesized via reactive maleation and toluene diisocyanate (TDI) were used as compatibilizers for these blends. Improvements in the toughness, phase morphology and thermal behavior of the PLA/PBAT/TEC (PBT) blend films were evaluated in terms of compatibilization effect. Read More

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Extrusion-Printing of Multi-Channeled Two-Component Hydrogel Constructs from Gelatinous Peptides and Anhydride-Containing Oligomers.

Biomedicines 2021 Apr 1;9(4). Epub 2021 Apr 1.

Institute of Pharmacy, Pharmaceutical Technology, Faculty of Medicine, University of Leipzig, Eilenburger Straße 15a, 04317 Leipzig, Germany.

The performance of artificial nerve guidance conduits (NGC) in peripheral nerve regeneration can be improved by providing structures with multiple small channels instead of a single wide lumen. 3D-printing is a strategy to access such multi-channeled structures in a defined and reproducible way. This study explores extrusion-based 3D-printing of two-component hydrogels from a single cartridge printhead into multi-channeled structures under aseptic conditions. Read More

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The Localization Behavior of Different CNTs in PC/SAN Blends Containing a Reactive Component.

Molecules 2021 Mar 1;26(5). Epub 2021 Mar 1.

Leibniz-Institut für Polymerforschung Dresden e.V. (IPF Dresden), Hohe Str. 6, 01069 Dresden, Germany.

Co-continuous blend systems of polycarbonate (PC), poly(styrene--acrylonitrile) (SAN), commercial non-functionalized multi-walled carbon nanotubes (MWCNTs) or various types of commercial and laboratory functionalized single-walled carbon nanotubes (SWCNTs), and a reactive component (RC, phenylmaleimide styrene maleic anhydride copolymer) were melt compounded in one step in a microcompounder. The blend system is immiscible, while the RC is miscible with SAN and contains maleic anhydride groups that have the potential to reactively couple with functional groups on the surface of the nanotubes. The influence of the RC on the localization of MWCNTs and SWCNTs (0. Read More

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Design, Synthesis, and Evaluation of Novel 3-Carboranyl-1,8-Naphthalimide Derivatives as Potential Anticancer Agents.

Int J Mol Sci 2021 Mar 9;22(5). Epub 2021 Mar 9.

Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Lodz, Poland.

We synthesized a series of novel 3-carboranyl-1,8-naphthalimide derivatives, mitonafide and pinafide analogs, using click chemistry, reductive amination and amidation reactions and investigated their in vitro effects on cytotoxicity, cell death, cell cycle, and the production of reactive oxygen species in a HepG2 cancer cell line. The analyses showed that modified naphthalic anhydrides and naphthalimides bearing - or -carboranes exhibited diversified activity. Naphthalimides were more cytotoxic than naphthalic anhydrides, with the highest IC value determined for compound (3. Read More

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Preparation and Characterization of Wood-Plastic Nanocomposites Based on Acrylonitrile-Butadiene-Styrene.

J Nanosci Nanotechnol 2021 Sep;21(9):4840-4845

Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.

The new wood-plastic nanocomposites (WPC) based on acrylonitrile-butadiene-styrene (ABS) resin was successfully blended with ABS and poplar flour (PF) through a HAAKE rheomix. The mechanical properties of nanocomposites, except for flexural modulus, were reduced after increasing the PF content. SEM photos show the reduction resulting from weak interfacial adhesion between the PF phase and ABS phase. Read More

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September 2021

N-acetylcysteine attenuates PGE and ROS production stimulated by 4-META/MMA-based resin in murine osteoblastic cells.

Dent Mater J 2021 Feb 27. Epub 2021 Feb 27.

Department of Dentistry for Children and Disabled Persons, Graduate School of Dental Medicine, Hokkaido University.

This study examined the effects of N-acetylcysteine (NAC) on the inflammatory reactions of murine osteoblastic cells cultured on the 4-methacryloxyethyl trimellitate anhydride/methyl methacrylate (4-META/MMA)-based resin. Superbond C&B (SB) was used as the 4-META/MMA-based resin and placed in a 48-well cell culture plate. The cells were cultured in αMEM (control) as well as on SB and SB in αMEM with NAC (SB+NAC). Read More

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February 2021

A Carbodiimide-Mediated P-C Bond-Forming Reaction: Mild Amidoalkylation of -Nucleophiles by Boc-Aminals.

Org Lett 2021 Mar 22;23(5):1726-1730. Epub 2021 Feb 22.

Department of Chemistry, Laboratory of Organic Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15784, Athens, Greece.

The first example of a carbodiimide-mediated P-C bond-forming reaction is described. The reaction involves activation of β-carboxyethylphosphinic acids and subsequent reaction with Boc-aminals using acid-catalysis. Mechanistic experiments using P NMR spectroscopy and DFT calculations support the contribution of unusually reactive cyclic phosphinic/carboxylic mixed anhydrides in a reaction pathway involving ion-pair "swapping". Read More

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Injectable oligomer-cross-linked gelatine hydrogels anhydride-amine-conjugation.

J Mater Chem B 2021 03;9(9):2295-2307

Institute of Pharmacy, Pharmaceutical Technology, Leipzig University, Eilenburger Straße 15 a, 04317 Leipzig, Germany and Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-Universität, Universitätsstraße 1, Düsseldorf, 40225 Düsseldorf, Germany.

Injectable gelatine-based hydrogels are valuable tools for drug and cell delivery due to their extracellular matrix-like properties that can be adjusted by the degree of cross-linking. We have established anhydride-containing oligomers for the cross-linking of gelatine via anhydride-amine-conjugation. So far, this conversion required conditions not compatible with cell encapsulation or in vivo injection. Read More

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Complex Organic Matter Synthesis on Siloxyl Radicals in the Presence of CO.

Front Chem 2020 1;8:621898. Epub 2021 Feb 1.

Department of Chemistry, The University of Memphis, Memphis, TN, United States.

Heterogeneous phase astrochemistry plays an important role in the synthesis of complex organic matter (COM) as found on comets and rocky body surfaces like asteroids, planetoids, moons and planets. The proposed catalytic model is based on two assumptions: siliceous rocks in both crystalline or amorphous states show surface-exposed defective centers such as siloxyl (Si-O•) radicals; the second phase is represented by gas phase CO molecules, an abundant C building block found in space. By means of quantum chemistry; (DFT, PW6B95/def2-TZVPP); the surface of a siliceous rock in presence of CO is modeled by a simple POSS (polyhedral silsesquioxane) where a siloxyl (Si-O•) radical is present. Read More

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February 2021

Reactive Extrusion of Maleic-Anhydride-Grafted Polypropylene by Torque Rheometer and Its Application as Compatibilizer.

Polymers (Basel) 2021 Feb 5;13(4). Epub 2021 Feb 5.

Univ Lyon, University Claude Bernard Lyon-1, CNRS, LAGEPP-UMR 5007, F-69622 Lyon, France.

This study is based upon the functionalization of polypropylene (PP) by radical polymerization to optimize its properties by influencing its molecular weight. Grafting of PP was done at different concentrations of maleic anhydride (MAH) and benzoyl peroxide (BPO). The effect on viscosity during and after the reaction was studied by torque rheometer and melt flow index. Read More

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February 2021

Tunable functionalization of nano-emulsions using amphiphilic polymers.

Soft Matter 2021 Feb 5;17(7):1788-1795. Epub 2021 Jan 5.

Université de Strasbourg, CNRS, LPB 7021, F-67000 Strasbourg, France.

Nano-emulsions are defined as stable oil droplets sizing below 300 nm. Their singular particularity lies in the loading capabilities of their oily core, much higher than other kinds of carrier. On the other hand, functionalizing the dynamic oil/water interface, to date, has remained a challenge. Read More

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February 2021

Robust cellulose-based composite adsorption membrane for heavy metal removal.

J Hazard Mater 2021 Mar 3;406:124746. Epub 2020 Dec 3.

School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States. Electronic address:

Adsorptive membranes offer an effective mode to remove heavy metal ions from contaminated water, due to the synergies made possible by low-cost, high-affinity adsorbents and highly scalable filtration in one system. However, the development of adsorptive membranes is hampered by their instability in the aqueous phase and low binding affinity with a broad spectrum of heavy metals in a reasonable flux. Herein, a regenerated cellulose support membrane is strongly grafted with stable and covalent-bonded polyelectrolyte active layers synthesized by a reactive layer-by-layer (LBL) assembly method. Read More

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How Oriented External Electric Fields Modulate Reactivity.

Chemistry 2021 Mar 21;27(18):5683-5693. Epub 2021 Jan 21.

Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081, HV, Amsterdam, The Netherlands.

A judiciously oriented external electric field (OEEF) can catalyze a wide range of reactions and can even induce endo/exo stereoselectivity of cycloaddition reactions. The Diels-Alder reaction between cyclopentadiene and maleic anhydride is studied by using quantitative activation strain and Kohn-Sham molecular orbital theory to pinpoint the origin of these catalytic and stereoselective effects. Our quantitative model reveals that an OEEF along the reaction axis induces an enhanced electrostatic and orbital interaction between the reactants, which in turn lowers the reaction barrier. Read More

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Novel phosphorus/nitrogen/boron-containing carboxylic acid as co-curing agent for fire safety of epoxy resin with enhanced mechanical properties.

J Hazard Mater 2021 01 23;402:123769. Epub 2020 Aug 23.

Department of Chemistry, School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China.

It is a great challenge to develop a high-efficiency reactive flame retardant, applied to anhydride-cured epoxy resin (EP) system, simultaneously possessing good compatibility with matrix and mechanical reinforcement. In this respect, we successfully synthesized a novel phosphorus/nitrogen/boron-containing carboxylic acid (TMDB) through the facile esterification and addition reaction among 1,3,5-tris(2-hydroxyethyl)isocyanurate (THEIC), maleic anhydride (MAH), 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and boric acid (BA). TMDB was utilized as a co-curing agent for EP/methyltetrahydrophthalic anhydride (MeTHPA) system and finally cured EP behaved great transparency, suggesting excellent compatibility of TMDB with EP. Read More

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January 2021

Calcium Modulation, Anti-Oxidant and Anti-Inflammatory Effect of Skin Allergens Targeting the Nrf2 Signaling Pathway in Alzheimer's Disease Cellular Models.

Int J Mol Sci 2020 Oct 21;21(20). Epub 2020 Oct 21.

Center for Neuroscience and Cell Biology and Institute for Biomedical Imaging and Life Sciences, University of Coimbra, 3000-548 Coimbra, Portugal.

Experimental evidence highlights nuclear factor (erythroid-derived 2)-like 2 (Nrf2) as a molecular target in Alzheimer's disease (AD). The well-known effect of electrophilic cysteine-reactive skin allergens on Nrf2-activation led to the hypothesis that these compounds could have a therapeutic role in AD. This was further supported by the neuroprotective activity of the skin allergen dimethyl fumarate (DMF), demonstrated in in vivo models of neurodegenerative diseases. Read More

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October 2020

Harnessing chemical energy for the activation and joining of prebiotic building blocks.

Nat Chem 2020 11 22;12(11):1023-1028. Epub 2020 Oct 22.

MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge, UK.

Life is an out-of-equilibrium system sustained by a continuous supply of energy. In extant biology, the generation of the primary energy currency, adenosine 5'-triphosphate and its use in the synthesis of biomolecules require enzymes. Before their emergence, alternative energy sources, perhaps assisted by simple catalysts, must have mediated the activation of carboxylates and phosphates for condensation reactions. Read More

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November 2020

Photochemical generation of acyl and carbamoyl radicals using a nucleophilic organic catalyst: applications and mechanism thereof.

Chem Sci 2020 Jun 4;11(24):6312-6324. Epub 2020 Jun 4.

ICIQ - Institute of Chemical Research of Catalonia , The Barcelona Institute of Science and Technology , Avenida Països Catalans 16 , 43007 , Tarragona , Spain . Email: ; http://www.iciq.org/research/research_group/prof-paolo-melchiorre/.

We detail a strategy that uses a commercially available nucleophilic organic catalyst to generate acyl and carbamoyl radicals upon activation of the corresponding chlorides and anhydrides a nucleophilic acyl substitution path. The resulting nucleophilic radicals are then intercepted by a variety of electron-poor olefins in a Giese-type addition process. The chemistry requires low-energy photons (blue LEDs) to activate acyl and carbamoyl radical precursors, which, due to their high reduction potential, are not readily prone to redox-based activation mechanisms. Read More

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Effectively toughening polypropylene with in situ formation of core-shell starch-based particles.

Carbohydr Polym 2020 Dec 26;249:116795. Epub 2020 Jul 26.

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China. Electronic address:

Impact modifier particles with the core-shell structure in the polypropylene (PP) matrix were successfully prepared in situ by melt blending PP, thermoplastic starch acetate (TPAS) and poly(ethylene octane) grafted with maleic anhydride (POE-MA). It was found that the core was formed by TPAS, while the shell was formed by POE-MA. This core-shell particle plays an important role in toughening PP. Read More

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December 2020

Transforming colloidal CsPbBr nanocrystals with poly(maleic anhydride--1-octadecene) into stable CsPbBr perovskite emitters through intermediate heterostructures.

Chem Sci 2020 Apr 20;11(15):3986-3995. Epub 2020 Mar 20.

Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

The preparation of strongly emissive CsPbBr perovskite nanocrystals with robust surface passivation is a challenge in the field of lead halide perovskite nanomaterials. We report an approach to prepare polymer-capped CsPbBr perovskite nanocrystals by reacting oleylammonium/oleate-capped CsPbBr nanocrystals with poly(maleic anhydride--1-octadecene) (PMAO). PMAO contains succinic anhydride units that are reactive towards the oleylamine species present on the CsPbBr nanocrystals' surface and produces polysuccinamic acid, which, in turn, triggers the CsPbBr to CsPbBr conversion. Read More

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Lysine acetylation of F-actin decreases tropomyosin-based inhibition of actomyosin activity.

J Biol Chem 2020 11 1;295(46):15527-15539. Epub 2020 Sep 1.

Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA. Electronic address:

Recent proteomics studies of vertebrate striated muscle have identified lysine acetylation at several sites on actin. Acetylation is a reversible post-translational modification that neutralizes lysine's positive charge. Positively charged residues on actin, particularly Lys and Lys, are predicted to form critical electrostatic interactions with tropomyosin (Tpm) that promote its binding to filamentous (F)-actin and bias Tpm to an azimuthal location where it impedes myosin attachment. Read More

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November 2020

Physical and Morphological Properties of Tough and Transparent PMMA-Based Blends Modified with Polyrotaxane.

Polymers (Basel) 2020 Aug 10;12(8). Epub 2020 Aug 10.

Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.

We prepared several novel, tough, and transparent poly(methyl methacrylate) (PMMA) blends modified with polyrotaxane (PR) and evaluated their physical properties and morphologies. A styrene/methyl methacrylate/maleic anhydride (SMM) copolymer that was miscible with PMMA was used as a reactive compatibilizer to enhance interfacial adhesion between the matrix resin and PR. A twin-screw melt-kneading extruder was used to prepare the polymer blends, and their thermal, morphological, optical, and mechanical properties were characterized. Read More

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Influence of formulation parameters on lipid oxidative stability of Pickering emulsion stabilized by hydrophobically modified starch particles.

Carbohydr Polym 2020 Oct 16;246:116649. Epub 2020 Jun 16.

College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, PR China.

Sunflower oil-in-water Pickering emulsions were fabricated using octenyl succinic anhydride modified rice starches as particulate stabilizers. The major factors influencing oxidative stability of emulsions were investigated. Results indicated that oxidative stability was enhanced with the increase of starch particle concentration and oil fractions. Read More

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October 2020

Synthesis of Sucrose Fatty Acid Esters by Using Mixed Carboxylic-fatty Anhydrides.

J Oleo Sci 2020 ;69(7):693-701

Laboratory of Organic Chemistry LR17ES08: Faculty of sciences in Sfax.

Fatty acid sugar esters are non-ionic surfactant active agents with excellent performance and many uses. This work is devoted to the synthesis of sugar esters by the esterification reaction of sugar with mixed carboxylicpalmitic anhydrides using resin Amberlyst-15 as heterogeneous acid catalyst. These anhydrides should be stable and react as acylating agents. Read More

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November 2020

Changes in Plasma Itaconate Elevation in Early Rheumatoid Arthritis Patients Elucidates Disease Activity Associated Macrophage Activation.

Metabolites 2020 Jun 10;10(6). Epub 2020 Jun 10.

Institute of Infection, Immunity and Inflammation, University of Glasgow, 120 University Place, Glasgow G12 8TA, UK.

Changes in the plasma metabolic profile were characterised in newly diagnosed rheumatoid arthritis (RA) patients upon commencement of conventional disease-modifying anti-rheumatic drug (cDMARD) therapy. Plasma samples collected in an early RA randomised strategy study (NCT00920478) that compared clinical (DAS) disease activity assessment with musculoskeletal ultrasound assessment (MSUS) to drive treatment decisions were subjected to untargeted metabolomic analysis. Metabolic profiles were collected at pre- and three months post-commencement of nonbiologic cDMARD. Read More

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Oxygen-producing catalase-based prodrug nanoparticles overcoming resistance in hypoxia-mediated chemo-photodynamic therapy.

Acta Biomater 2020 08 2;112:234-249. Epub 2020 Jun 2.

Engineering Research Center for Biomedical Materials, Anhui Key Laboratory of Modern Biomanufacturing, School of Life Sciences, Anhui University, 111 Jiulong Road, Hefei, Anhui Province, 230601, PR China. Electronic address:

Extreme hypoxia inside solid tumors is the primary barrier against the advance of chemotherapy and photodynamic therapy (PDT). To address this problem, a hybrid nano-enzyme prodrug system was developed to alleviate hypoxia as well as simultaneously sensitize chemo-photodynamic therapy. Lactobionic acid (LA) and doxorubicin (DOX) precursor (cis-aconitic anhydride-linked doxorubicin, CAD) were pre-conjugated onto the side chain of catalase (CAT), then co-assembled with chlorin e6 (Ce6) to form LA-CAT-CAD@Ce6 nanoparticles (LCC@Ce6-NPs). Read More

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Maleic anhydride grafted onto high density polyethylene with an enhanced grafting degree via monomer microencapsulation.

Heliyon 2020 Apr 22;6(4):e03742. Epub 2020 Apr 22.

Research Centre for Chemistry, Indonesian Institute of Sciences (LIPI), Kawasan Puspiptek Gedung 452, Serpong, Tangerang Selatan, Banten, 15314, Indonesia.

High-density polyethylene (HDPE) is among the flexible polymers on account of its appropriate processability and adequate mechanical properties. Grafting reactive monomers such as glycidyl methacrylate (GMA) and maleic anhydride (MAH) onto polyethylene was one of the ultimate choices to improve the physicochemical properties of HDPE. MAH is an appropriate option for grafting onto HDPE owing to its low reactivity and it relatively undergoes a direct grafting onto the polymer. Read More

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Virus-Inspired Mimics: Dual-pH-Responsive Modular Nanoplatforms for Programmable Gene Delivery without DNA Damage with the Assistance of Light.

ACS Appl Mater Interfaces 2020 May 8;12(20):22519-22533. Epub 2020 May 8.

Huaxi MR Research Center (HMRRC), Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu 610041, P. R. China.

Although tremendous efforts have been made to construct gene vectors incorporating multiple functionalities and moieties, designing gene vectors integrating innovative features to successfully negotiate biological impediments, which hamper efficacious responses in gene-based therapy, is still very urgent. Herein, a light-induced virus-inspired mimic, in which a modular envelope was utilized to mask polyethylenimine/DNA (PD) polyplexes, was developed based on two pH-responsive polymers. The virus-inspired envelope, which was capable of achieving multitargeting and dual-pH-responsiveness in endo/lysosomal compartments, was composed of an internalizing arginylglycylaspartic acid-modified module and a citraconic anhydride-modified nuclear localized signal-functionalized module. Read More

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(2-Fluoroallyl)boration of Ketones with (2-Fluoroallyl)boronates.

J Org Chem 2020 May 5;85(10):6295-6308. Epub 2020 May 5.

N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation.

Efficient routes toward activation of -chlorofluorocyclopropane-derived (2-fluoroallyl)boronates for allylboration of various ketones including functionalized and low-reactive ones were developed. Increasing the boron electrophilicity by the transformation of a boronate moiety into a borinic ester with BuLi/trifluoroacetic anhydride (TFAA) makes (2-fluoroallyl)boration of acetyl arenes/hetarenes and aliphatic ketones possible with high diastereoselectivity. For low-reactive or sterically hindered ketones (e. Read More

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N-Methylated Peptide Synthesis via Generation of an Acyl N-Methylimidazolium Cation Accelerated by a Brønsted Acid.

Angew Chem Int Ed Engl 2020 07 28;59(31):12925-12930. Epub 2020 May 28.

Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.

The development of a robust amide-bond formation remains a critical aspect of N-methylated peptide synthesis. In this study, we synthesized a variety of dipeptides in high yields, without severe racemization, from equivalent amounts of amino acids. Highly reactive N-methylimidazolium cation species were generated in situ to accelerate the amidation. Read More

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Effects of Methylenediphenyl 4,4'-Diisocyanate and Maleic Anhydride as Coupling Agents on the Properties of Polylactic Acid/Polybutylene Succinate/Wood Flour Biocomposites by Reactive Extrusion.

Materials (Basel) 2020 Apr 3;13(7). Epub 2020 Apr 3.

Department of Forest Products and Biotechnology, Kookmin University, Seoul 02707, Korea.

Polylactic acid (PLA)/polybutylene succinate (PBS)/wood flour (WF) biocomposites were fabricated by in situ reactive extrusion with coupling agents. Methylenediphenyl 4,4'-diisocyanate (MDI) and maleic anhydride (MA) were used as coupling agents. To evaluate the effects of MDI and MA, various properties (i. Read More

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