ADVANCED PRODUCTION TECHNOLOGY OF HIGH PURITY ARABINOGALACTAN
Abstract
The technology of larch wood arabinogalactan production, combined with the preparation of dihydroquercetin, has been developed. The improved process includes the following steps: extraction of larch raw material with hot water (80–90 °C) after extraction of dihydroquercetin from it; purification of the obtained extract from high-molecular impurities by ultrafiltration using a hydrophobic membrane; concentration and additional purification of the extract from low molecular weight phenolic impurities by diafiltration using a hydrophilic membrane; spray drying of the concentrate. The concentrate drying parameters are optimized. The improved technology makes it possible to obtain a product with a main substance content ≥98%, to exclude the use of imported reagents – flocculants, and, therefore, the expenses of separation from clarified extract cake and its utilization are eliminated. Undoubted advantages of the developed technology are the reduction of the purification time of the extract, as well as the ability to automate the process of AG production and realize it in a continuous mode, that increase the feasibility and economic efficiency of the process, as well as to increase the exploitation time of the hydrophilic membrane, and to reduce energy costs.
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