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  1. Article ; Online: Preparation and Characterization of di- and Tricarboxylic Acids-Modified Arabinogalactan Plasticized Composite Films.

    Malyar, Yuriy N / Borovkova, Valentina S / Kazachenko, Alexander S / Fetisova, Olga Yu / Skripnikov, Andrey M / Sychev, Valentin V / Taran, Oxana P

    Polymers

    2023  Volume 15, Issue 9

    Abstract: To ensure the high quality of water, it is necessary to remove toxic pollutants. At present, purification of water is implemented using various sorbents. The efficient sorption materials are modified polysaccharides. In this study, we report on a new ... ...

    Abstract To ensure the high quality of water, it is necessary to remove toxic pollutants. At present, purification of water is implemented using various sorbents. The efficient sorption materials are modified polysaccharides. In this study, we report on a new environmentally friendly method for modifying larch hemicellulose-arabinogalactan (AG)-with polybasic carboxylic acids (citric, succinic, oxalic, and adipic) to obtain composite materials. The synthesized AG derivatives have been explored by a complex of physicochemical methods, including gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffractometry (XRD), scanning electron microscopy (SEM), and sorption capacity investigations. It is shown that the heat treatment results in the formation of additional inter- and intramolecular bonds between carboxylic acids and polysaccharide molecules. The formation of ester bonds has been confirmed by the appearance of absorption bands in the IR spectra in the range of 1750-1690 cm
    Language English
    Publishing date 2023-04-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15091999
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Reductive Fractionation of Flax Shives in Ethanol Medium over RuNi Bimetallic Catalysts.

    Miroshnikova, Angelina V / Sychev, Valentin V / Tarabanko, Valery E / Kazachenko, Aleksandr S / Skripnikov, Andrey M / Eremina, Anna O / Kosivtsov, Yuriy / Taran, Oxana P

    International journal of molecular sciences

    2023  Volume 24, Issue 14

    Abstract: The reductive catalytic fractionation of flax shives in the presence of bimetallic NiRu catalysts supported on oxidized carbon materials (CM) such as mesoporous Sibunit and carbon mesostructured by KAIST (CMK-3) was studied. The catalysts based on CMK-3 ... ...

    Abstract The reductive catalytic fractionation of flax shives in the presence of bimetallic NiRu catalysts supported on oxidized carbon materials (CM) such as mesoporous Sibunit and carbon mesostructured by KAIST (CMK-3) was studied. The catalysts based on CMK-3 were characterized by a higher surface area (1216 m
    MeSH term(s) Ethanol ; Flax ; Catalysis ; 1-Propanol ; Propanols ; Carbon
    Chemical Substances Ethanol (3K9958V90M) ; 1-Propanol (96F264O9SV) ; Propanols ; Carbon (7440-44-0)
    Language English
    Publishing date 2023-07-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms241411337
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: New Azo Derivatives of Ethanol Lignin: Synthesis, Structure, and Photosensitive Properties.

    Borovkova, Valentina S / Malyar, Yuriy N / Vasilieva, Natalia Yu / Skripnikov, Andrey M / Ionin, Vladislav A / Sychev, Valentin V / Golubkov, Viktor A / Taran, Oxana P

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 4

    Abstract: Water-soluble azo derivatives of lignin were synthesized by the azo coupling reaction using organosolv ethanol lignin and diazonium salts based on sulfanilic acid and p-nitroaniline. The structure of azo derivatives of lignin were studied by nuclear ... ...

    Abstract Water-soluble azo derivatives of lignin were synthesized by the azo coupling reaction using organosolv ethanol lignin and diazonium salts based on sulfanilic acid and p-nitroaniline. The structure of azo derivatives of lignin were studied by nuclear magnetic resonance, Fourier-transform infrared spectroscopy, and gel permeation chromatography. It was found that the azobenzene bonds formed in the azo coupling reaction of macromolecules impart the photosensitive properties to the synthesized polymers via cis-trans photoisomerization of the diazobenzene group. It was shown experimentally that the synthesized polymers exhibited good solubility both in the aqueous media in a wide (2-12) pH range and in DMSO and THF organic solvents, which opens up new prospects for their application.
    Language English
    Publishing date 2023-02-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16041525
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Acceleration by Double Activation Catalysis and its Negation with Rising Temperature in Hydrolysis of Cellobiose with Phthalic and Hydrochloric Acids.

    Tarabanko, Nikolay / Golubkov, Viktor A / Sychev, Valentin V / Tarabanko, Valery E / Taran, Oxana P

    Chemphyschem : a European journal of chemical physics and physical chemistry

    2021  Volume 23, Issue 3, Page(s) e202100804

    Abstract: Double activation catalysis was experimentally observed in hydrolysis of cellobiose catalyzed simultaneously with phthalic and hydrochloric acids, confirming earlier theoretical prediction known from literature. Both acids can catalyze the reaction ... ...

    Abstract Double activation catalysis was experimentally observed in hydrolysis of cellobiose catalyzed simultaneously with phthalic and hydrochloric acids, confirming earlier theoretical prediction known from literature. Both acids can catalyze the reaction individually, and contribution of the double-activation pathway to the total reaction rate declines as temperature increases. In fact, above a certain temperature, the hydrolysis rate in presence of both acids becomes lower than the sum of the rates for the two acids acting individually. A kinetic model is proposed to explain this transition between double-activated catalysis and inhibition. The trend of declining contribution of cooperative catalytic pathway with rising temperature is theorized to be generally applicable for any reaction with a pathway involving simultaneous action of two catalysts when either of them can individually catalyze the reaction.
    MeSH term(s) Acceleration ; Catalysis ; Cellobiose/metabolism ; Hydrochloric Acid ; Hydrolysis ; Kinetics ; Temperature
    Chemical Substances Cellobiose (16462-44-5) ; Hydrochloric Acid (QTT17582CB)
    Language English
    Publishing date 2021-12-28
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2025223-7
    ISSN 1439-7641 ; 1439-4235
    ISSN (online) 1439-7641
    ISSN 1439-4235
    DOI 10.1002/cphc.202100804
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Larix Sibirica Arabinogalactan Hydrolysis over Zr-SBA-15; Depolymerization Insight.

    Sychev, Valentin V / Malyar, Yuriy N / Skripnikov, Andrey M / Trotsky, Yuriy A / Zaitseva, Yulia N / Eremina, Anna O / Borovkova, Valentina S / Taran, Oxana P

    Molecules (Basel, Switzerland)

    2022  Volume 27, Issue 24

    Abstract: Arabinogalactan depolymerization over solid Zr-containing SBA-15-based catalyst was studied via HPLC, GPC, and theoretical modeling. Arabinogalactans (AG) are hemicelluloses mainly present in larch wood species, which can be extracted on an industrial ... ...

    Abstract Arabinogalactan depolymerization over solid Zr-containing SBA-15-based catalyst was studied via HPLC, GPC, and theoretical modeling. Arabinogalactans (AG) are hemicelluloses mainly present in larch wood species, which can be extracted on an industrial scale. The application of solid acid catalysts in the processes of hemicellulose conversion can exclude serious drawbacks such as equipment corrosion, etc. Characterization of 5%Zr-SBA-15 confirmed the successful formation of the mesoporous structure inherent to SBA-15 with fine Zr distribution and strong acidic properties (XRD, XPS, FTIR, pH
    Language English
    Publishing date 2022-12-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules27248756
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  6. Article ; Online: Sulfation of Birch Wood Microcrystalline Cellulose with Sulfamic Acid Using Ion-Exchange Resins as Catalysts.

    Kazachenko, Aleksandr S / Vasilieva, Natalia Yu / Berezhnaya, Yaroslava D / Fetisova, Olga Yu / Borovkova, Valentina S / Malyar, Yuriy N / Sudakova, Irina G / Sychev, Valentin V / Issaoui, Noureddine / Lutoshkin, Maxim A / Karacharov, Anton A

    Polymers

    2023  Volume 15, Issue 5

    Abstract: Cellulose sulfates are important biologically active substances with a wide range of useful properties. The development of new methods for the production of cellulose sulfates is an urgent task. In this work, we investigated ion-exchange resins as ... ...

    Abstract Cellulose sulfates are important biologically active substances with a wide range of useful properties. The development of new methods for the production of cellulose sulfates is an urgent task. In this work, we investigated ion-exchange resins as catalysts for the sulfation of cellulose with sulfamic acid. It has been shown that water-insoluble sulfated reaction products are formed in high yield in the presence of anion exchangers, while water-soluble products are formed in the presence of cation exchangers. The most effective catalyst is Amberlite IR 120. According to gel permeation chromatography, it was shown that the samples sulfated in the presence of the catalysts KU-2-8, Purolit s390 plus, and AN-31 SO
    Language English
    Publishing date 2023-02-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15051116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Composition and Structure of Aspen (

    Borovkova, Valentina S / Malyar, Yuriy N / Sudakova, Irina G / Chudina, Anna I / Zimonin, Dmitriy V / Skripnikov, Andrey M / Miroshnikova, Angelina V / Ionin, Vladislav A / Kazachenko, Alexander S / Sychev, Valentin V / Ponomarev, Ilya S / Issaoui, Noureddine

    Polymers

    2022  Volume 14, Issue 21

    Abstract: In this study, hemicelluloses of aspen wood ( ...

    Abstract In this study, hemicelluloses of aspen wood (
    Language English
    Publishing date 2022-10-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym14214521
    Database MEDical Literature Analysis and Retrieval System OnLINE

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