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Publisher: Altai State University
Journal: Khimiia rastitel'nogo syr'ia (Chemistry of plant raw material)
Languages: Russian
Types: Article
Subjects: Larix sibirica Ledeb., arabinogalactan, quantitative 13C NMR spectroscopy, monosaccharide composition, HPLC, the molecular weight distribution, древесина лиственницы; арабиногалактан; количественная спектроскопия ЯМР 13С; моносахаридный состав; ВЭЖХ; молекулярно-массовое распределение
A comparative study of arabinogalactan (AG) samples, isolated by aqueous extraction from wood of different larch species in the same experimental conditions, has been realized to increase the raw materials base for AG manufacture and the product standardization.Sawdust, obtained from wood of Larix sibirica Ledeb., Larix gmelinii (Rupr.) Rupr., Larixcajanderi Mayr, as well as lumber wastes – wood chips from Larix sibirica Ledeb. and Larix olgensis var. Koreana are used for the investigations. The wood extractions are carried out with hydromodulus of 1 : 10 at 23 and 90 °C during 4 hours. Arabinogalactan is purified with extract precipitation from aqueous solution into ethanol, taken in excess.It is found that the wood of investigated larch species contains a significant quantity of arabinogalactan (up to 10–17% by weight of absolutely dry wood) and can serve as the source of its manufacture. The extracts, obtained at room temperature, contain less phenolic impurities (flavonoids and tannins), which are extracted by hot water togetherwith AG.According to HPLC data, AG samples have a molecular mass from 12450 to 22700 Da, as well as they are characterized by rather low polydispersity (1,3–2,0). The samples, examined by quantitative 13C NMR spectroscopy, demonstrate the short range of variations of Gal/Ara in AG macromolecules of studied larch species: 1 link of arabinose relates to 10÷12 units of galactose. It is found that the AG of Gmelinii larch contains in its structure more galactose side chains, consisting of two or more galactose units, and less number of arabinose side chains in compare with the same in AG of Siberian and Cajanderi larches. AG macromolecules of Siberian larch are characterized by heightened content of short side chains, consisting of one end unit of galactose. AG of Cajanderi larch occupies the intermediate position on these factors.The data obtained indicate that the studied AG samples have quite close structural and molecular-mass characteristics that could facilitate the product standardization at its industrial manufacture.
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    • Received December 29, 2014
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