THE RESEARCH OF GMELIN LARCH (LARIX GMELINII (RUPR.) RUPR.) GUM
Abstract
The samples of Gmelin larch (Larix gmelinii (Rupr.) Rupr.) gum, selected from a variety of trees and from different parts of the tree in vicinities of Ulan-Ude city (Buryatia), were investigated with GPC, IR, quantitative NMR 13C spectroscopy and spectrophotometry methods. The samples were dissolved in distilled water at a room temperature. The mechanical impurities were filtered, the transparent solutions were evaporated to dryness, and the dry residues were purified by reprecipitation from water to ethanol. The content of mechanical impurities was 0,1–4,8% by the mass of absolutely dry gum. Aqueous solutions of gum are subacidic, as well as AG isolated from wood of Siberian and Gmelin larches. It is established, that Gmelin larch gum is a high purity arabinogalactan (~99%) with minor impurities of flavonoids, tannins and mineral substances. Molecular-mass characteristics and monosaccharide composition of Gmelin larch gum arabinogalactan is similar to arabinogalactan recovered from wood of all previously studied species of larch growing in Siberia and the Far East. The data obtained allow recommending Gmelin larch gum for application in medicine, veterinary, the food and cosmetic industry.
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References
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