Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.3390/molecules27010266

Ключевые слова: antioxidant activity, delignification, gel permeation chromatography, hemicellulose, molecular weight distribution, wood polysaccharides

Аннотация: Spruce (Picea abies) wood hemicelluloses have been obtained by the noncatalytic and catalytic oxidative delignification in the acetic acid-water-hydrogen peroxide medium in a processing time of 3–4 h and temperatures of 90–100◦ C. In the catalytic process, the H2 SO4, MnSO4, TiO2, and (NH4 )6 Mo7 O24 catalysts have been used. A polysaccharide yield of up to 11.7 wt% has been found. The hemicellulose composition and structure have been studied by a complex of physicochemical methods, including gas and gel permeation chromatography, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The galactose:mannose:glucose:arabinose:xylose monomeric units in a ratio of 5:3:2:1:1 have been identified in the hemicelluloses by gas chromatography. Using gel permeation chromatography, the weight average molar mass Mw of hemicelluloses has been found to attain 47,654 g/mol in noncatalytic delignification and up to 42,793 g/mol in catalytic delignification. Based on the same technique, a method for determining the α and k parameters of the Mark–Kuhn–Houwink equation for hemicelluloses has been developed; it has been established that these parameters change between 0.33–1.01 and 1.57–472.17, respectively, depending on the catalyst concentration and process temperature and time. Moreover, the FTIR spectra of the hemicellulose samples contain all the bands characteristic of heteropolysaccharides, specifically, 1069 cm−1 (C–O–C and C–O–H), 1738 cm−1 (ester C=O), 1375 cm−1 (–C–CH3 ), 1243 cm−1 (–C–O–), etc. It has been determined by the thermogravimetric analysis that the hemicelluloses isolated from spruce wood are resistant to heating to temperatures of up to ~100◦ C and, upon further heating, start destructing at an increasing rate. The antioxidant activity of the hemicelluloses has been examined using the compounds simulating the 2,2-diphenyl-2-picrylhydrazyl free radicals. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Журнал: Molecules

Выпуск журнала: Vol. 27, Is. 1

Номера страниц: 266

ISSN журнала: 14203049

Издатель: MDPI

• Borovkova Valentina S. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Malyar Yuriy N. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Sudakova Irina G. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Chudina Anna I. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Skripnikov Andrey M. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Fetisova Olga Yu. (Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Kazachenko Alexander S. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Miroshnikova Angelina V. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Zimonin Dmitriy V. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Ionin Vladislav A. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia; Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
• Seliverstova Anastasia A. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia)
• Samoylova Ekaterina D. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Pr Svobodny 79, Krasnoyarsk 660041, Russia)
• Issaoui Noureddine (Univ Monastir, Fac Sci, Lab Quantum & Stat Phys LR18ES18, Monastir 5079, Tunisia)

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