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  1. No Access

    Article

    Sulfation of Abies Ethanol Lignin by Complexes of Sulfur Trioxide with 1,4-Dioxane and Pyridine

    An optimization of sulfation of abies ethanol lignin by complexes of sulfuric anhydride with pyridine and 1,4-dioxane has been performed. Conditions for the implementation of the sulfation of abies ethanol lig...

    Yu. N. Malyar, N. Yu. Vasil’yeva… in Russian Journal of Bioorganic Chemistry (2021)

  2. No Access

    Article

    Preparation and Structural and Electrochemical Characteristics of a Carbon-Containing Material Based on Aspen Bark Modified with Zinc and Iron Chlorides

    The possibility of using aspen bark modified with zinc and iron chlorides for preparing highly porous materials with specific properties was examined. The effect of the treatment temperature and modifiers on t...

    S. I. Tsyganova, A. S. Romanchenko, O. Yu. Fetisova… in Russian Journal of Applied Chemistry (2020)

  3. No Access

    Article

    Optimization of the process of abies ethanol lignin sulfation by sulfamic acid–urea mixture in 1,4-dioxane medium

    The new process of abies ethanol lignin sulfation by a low-toxic mixture of sulfamic acid and urea in 1,4-dioxane medium was optimized, and the structure of sulfated ethanol lignin was studied. The process of ...

    B. N. Kuznetsov, N. Yu. Vasilyeva, A. S. Kazachenko… in Wood Science and Technology (2020)

  4. No Access

    Article

    Influence Exerted by Cross-Linking Effect on Properties of Sorbents Produced from Aspen and Larch Bark

    Method is suggested for obtaining biochar materials by treatment of a finely dispersed (≤0.1 mm) bark of aspen and(or) larch with a 40% formaldehyde solution and subsequent thermal activation of the activated ...

    N. M. Mikova, G. P. Skvortsova, E. V. Mazurova… in Russian Journal of Applied Chemistry (2019)

  5. No Access

    Article

    Synthesis and Study of Copper-Containing Polymers of Microcrystalline Cellulose Sulfates from Larch Wood

    For the first time, the synthesis of water-soluble copper-containing microcrystalline cellulose sulfates (Сu-MCS) has been performed by the ion exchange method. The composition of the products has been studied...

    A. V. Levdansky, N. Yu. Vasilyeva, N. G. Maximov… in Russian Journal of Bioorganic Chemistry (2018)

  6. No Access

    Article

    Polyphenols of Wood Bark: Organic Precursors for the Production of Polymer Aerogels

    A new method for preparation of organic aerogels by sol–gel polymerization of formaldehyde with polyphenols (PPs), isolated from larch bark and birch bark, was developed. The functional composition and propert...

    N. M. Mikova, L. I. Grishechko, G. P. Skvortsova… in Russian Journal of Bioorganic Chemistry (2018)

  7. No Access

    Article

    Optimization of the Production Process of Biologically-Active Betulin Diacetate from Raw and Activated Birch Bark

    The effect of the conditions of the acetylation process of raw and activated birch bark on the yield and composition of the products is investigated. The structure of biologically active betulin diacetate (BDA...

    S. A. Kuznetsova, B. N. Kuznetsov… in Theoretical Foundations of Chemical Engine… (2018)

  8. No Access

    Article

    Synthesis and Study of Copper-Containing Polymers Based on Sulfated Arabinogalactan

    Synthesis of water-soluble copper-containing sulfates of arabinogalactan was carried out for the first time by the ion exchange method. Their composition and structure were studied by the methods of elemental ...

    B. N. Kuznetsov, N. Yu. Vasilyeva… in Russian Journal of Bioorganic Chemistry (2017)

  9. No Access

    Article

    Sulfation of arabinogalactan by sulfamic acid in dioxane

    The sulfation of arabinogalactan (AG) by sulfamic acid in the presence of urea in dioxane has been studied. The degree of AG sulfation increases as the sulfation temperature increases from 70 to 95°C. As indic...

    N. Yu. Vasil’eva, A. V. Levdansky… in Russian Journal of Bioorganic Chemistry (2015)

  10. No Access

    Article

    Extraction of betulin from birch bark and study of its physico-chemical and pharmacological properties

    Betulin-containing products were obtained in a yield of about 40% from absolutely dry birch bark. The content of betulin in the products was 74–75% or 85–89% depending on the presence of sodium or potassium hy...

    S. A. Kuznetsova, G. P. Skvortsova… in Russian Journal of Bioorganic Chemistry (2014)

  11. No Access

    Article

    Synthesis of the betulin dipropionate from the upper birch bark

    A one-step synthesis of the betulin dipropionate directly from the birch bark without a separate stage of the betulin preparation is described in this paper. Extracts with different content of the betulin dipr...

    S. A. Kuznetsova, G. P. Skvortsova… in Russian Journal of Bioorganic Chemistry (2012)

  12. No Access

    Article

    Influence of mechanical treatment on the properties of betulin, betulin diacetate, and their mixture with water-soluble polymers

    The influence of mechanical treatment on the properties of betulin, betulin diacetate, and their mixture with water-soluble polymers was studied. It was shown that mechanical treatment in a planetary mill-acti...

    M. A. Mikhailenko, T. P. Shakhtshneider… in Chemistry of Natural Compounds (2011)

  13. No Access

    Article

    Phosphorylation of phospholamban in experimental myocardial infarction and resistance to proteolysis during phosphorylation

    A. E. Antipenko, O. G. Goncharov… in Bulletin of Experimental Biology and Medic… (1983)