Physicochemical characteristics of polysaccharides from catalytic and noncatalytic acetic acid-peroxide delignification of larch wood

Chudina, Anna I.; Malyar, Yuriy N.; Sudakova, Irina G.; Kazachenko, Аleksandr S.; Skripnikov, Andrey M.; Borovkova, Valentina S.; Kondrasenko, Alexandеr A.; Mazurova, E. V.; Fetisova, Olga Yu.; Ivanov, Ivan P.

doi:10.1007/s13399-021-01833-y

Cited by 5 publications

(9 citation statements)

References 46 publications

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“…The presence of small amounts of xylose and arabinose is indicative of the presence of another important polysaccharide: arabinoglucuronoxylan. These components determined for the spruce ( Picea abies ) HCs are analogous to those reported in the previous studies on the HC isolation from coniferous, although their ratios are somewhat different [ 1 , 13 ].…”

Section: Resultssupporting

confidence: 79%

“…The band around 2930 cm −1 was attributed to the C–H stretching vibration. The intense absorption band at 1069 cm −1 was attributed to the C–O–C and C–O–H stretching vibrations of a pyranose ring [ 1 , 27 ]. In addition, all the HC samples are acetylated, which is reflected in three acetyl ether bands at 1738 cm −1 (ester C=O), 1375 cm −1 (–C–CH 3 ), and 1243 cm −1 (–C–O–).…”

Section: Resultsmentioning

confidence: 99%

“…The residual lignin absorption band at 1511 cm −1 is most pronounced in the spectrum of the HCs obtained without a catalyst, which evidences incomplete delignification. When the (NH 4 ) 6 Mo 7 O 24 , MnSO 4 , and TiO 2 catalysts are used, this band is insignificant [ 1 ]; in the case of the H 2 SO 4 catalyst used, it is completely absent. -…”

Section: Resultsmentioning

confidence: 99%

“…Hemicelluloses (HCs) are plant cell wall polysaccharides, which are the second most widely used renewable plant polymers after cellulose in lignocellulosic materials. They represent heteropolysaccharides with a disordered polymer structure consisting of different sugar units [ 1 ], depending on a plant type and extraction method. The HCs that are dominant in softwood are partially acetylated galactoglucomannans and glucomannans (up to 20–25% of the wood weight) and arabinoglucuronoxylans (7–10% of the wood weight) [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…The pretreatment using acetic acid with hydrogen peroxide allows the efficient fractionation of lignocellulosic materials and cleavage of the lignin aromatic rings at the preserved polymer structure of other carbohydrates [ 20 , 21 ]. Importantly, the delignification products consisting of soluble HCs and lignin depolymerization products are free of toxic chlorine and sulfur-containing compounds [ 1 , 22 ]. In addition, the presence of various catalysts, especially those based on variable valence metals, intensifies the delignification process due to the formation of peroxocomplexes, which are strong oxidants and destruct lignin more completely [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Molecular Characteristics and Antioxidant Activity of Spruce (Picea abies) Hemicelluloses Isolated by Catalytic Oxidative Delignification

et al. 2022

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Spruce (Piceaabies) 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 H2SO4, MnSO4, TiO2, and (NH4)6Mo7O24 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.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular Characteristics and Antioxidant Activity of Spruce (Picea abies) Hemicelluloses Isolated by Catalytic Oxidative Delignification

et al. 2022

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Isolation and Characterization of the Hemicelluloses Polysaccharides of Scots Pine (Pinus Sylvestris) Wood

Garyntseva,

Levdansky,

Kondrasenko

et al. 2023

Russ J Bioorg Chem

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Isolation and Characterization of Hemicelluloses Polysaccharides of Scots Pine Wood (Pinus Sylvestris)

Гарынцева¹,

Levdansky²,

Kondrasenko³

et al. 2022

JCPRM

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Many natural polysaccharides have biological activity, which allows them to be used to obtain medicines. The development of new methods for the isolation of polysaccharides from plant materials, as well as the study of their properties and structure, is an actual task. In this work the polysaccharide galactoglucomannan (GGM) was isolated from pine wood time by the peroxide delignification in the “acetic acid-water” medium in the presence (NH4)6Mo7O24.Its yield was 10.1 wt.% from the weight of wood and 58.1 wt.% from the content of hemicelluloses in wood. By 13С NMR method it was found that the degree of GGM acetylation is 0.23 with substitution of carbon atoms of the pyranose ring at C2 and C3. According to the X-ray data, GGM has an amorphous supramolecular structure. The polysaccharide gluoxylan (GX) was isolated by alkaline extraction from the cellulose product obtained after peroxide delignification. Its yield was 4.3 wt.%. from wood and 24.5 wt.% from the content of hemicelluloses in wood.Glucoxylan does not contain acetyl groups (data from IR and NMR spectroscopy), it has a crystalline supramolecular structure and is poorly soluble in water. Composition and structure of the obtained polysaccharides were studied using chemical methods of analysis, IR spectroscopy, 1H, 13C, 2D HSQC NMR spectroscopy, gas chromatography, X-ray analysis.

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Physicochemical characteristics of polysaccharides from catalytic and noncatalytic acetic acid-peroxide delignification of larch wood

Cited by 5 publications

References 46 publications

Molecular Characteristics and Antioxidant Activity of Spruce (Picea abies) Hemicelluloses Isolated by Catalytic Oxidative Delignification

Molecular Characteristics and Antioxidant Activity of Spruce (Picea abies) Hemicelluloses Isolated by Catalytic Oxidative Delignification

Isolation and Characterization of the Hemicelluloses Polysaccharides of Scots Pine (Pinus Sylvestris) Wood

Isolation and Characterization of Hemicelluloses Polysaccharides of Scots Pine Wood (Pinus Sylvestris)

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