The Regional and Age-Related Changes of Hardwood Lignin-Carbohydrate Matrix Chemical Composition in Terms of Aspen (Populus Tremula)

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UDС

630*811; 630*812/813; 547.992.3

DOI:

10.17238/issn0536-1036.2015.1.133

Abstract

The demand for semi-finished fiber for paper and paperboard manufacturing is increased significantly as a result of their consumption. Improvement of wood raw material consumption structure leads to increase of fast-growing hardwood allocated for processing. Data on the structure, composition and properties of wood, wood components transformation regularities at the molecular and supramolecular levels in the chemical and physical impacts are needed for the industrial processing control and product quality. Several factors, such as complex of climatic conditions, age of a tree and felling time, influence on the content and distribution of the main components of wood, even within the same species. In recent decades many scientists pay their attention to the aspen wood in genetic and biochemical studies, and consider the aspen wood as a potential raw material for the pulp and paper industry in the development of chemi-thermomechanical pulp and some other fibrous materials. The purpose of this paper is to show the influence of abiotic factors and lifetime on the chemical composition of the fast-growing hardwood in terms of an aspen. To achieve this purpose it is necessary to: - investigate the chemical composition of mixed-age aspen wood, selected in different climatic zones; - evaluate the influence of abiotic factors on the content of the main components of wood; - assess the impact of the tree life time to change the content of basic chemical components of wood. The stick of aspen age from 10 to 45 years was felled for the study. Aspen wood was collected in the natural stands in the summer on the territory of the northern and central areas of the taiga. The paper presents the results of a study of volume components of the all-aged wood of aspen (Populus tremula). For a reliable assessment of the total value of the lignin content at aspen wood it is necessary to consider the content of acid-soluble fraction, which increases the value of lignin in wood. Mild climate conditions of the middle taiga allow the carbohydrate components biosynthesis to dominate, which is reflected in the higher content of cellulose compared with the samples from the northern taiga. These data indicate the dependencies of the content of cellulose and lignin on the abiotic factors, and the dependencies of the age of wood and the lignin content. As for the changes in the content of alcohol-soluble extractives with aging we can note the minor variations and the stable pattern in their content.

Authors

M.A. Pustynnaya1, Postgraduate M.A. Gusakova1, Candidate of Engineering K.G. Bogolitsyn1,2, Doctor of Chemistry, Professor

Affiliation

1Institute of Ecological Problems of the North, Ural Branch of the Russian Academy of Sciences, Naberezhnaya Severnoy Dviny, 23, Arkhangelsk, 163000; Russia; e-mail: lobanova2806@gmail.com; ph.: (8182) 28-55-40  2Northen (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia

Keywords

aspen, abiotic factors, cellulose, acid-soluble lignin, Klason lignin, extractives, hydrolyzable polysaccharides.

References

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