Method for simultaneously extracting arabinogalactan and dihydroquercetin from dahurian larch

Abstract

The invention discloses a method for extracting arabinogalactan and dihydroquercetin from dahurian larch. The method is characterized in that dahurian larch is taken as a raw material and is subjected to supersonic extraction with an ethanol solution; solid and liquid are separated from each other through filtering, so that an extracting solution is obtained; absolute ethyl alcohol is fed into the extracting solution till polysaccharide is sufficiently settled; the polysaccharide is subjected to high-speed centrifugation; precipitation, refrigeration and drying are performed, so that dahurian larch arabinogalactan crude extract is obtained; ethyl alcohol in supernate is concreted till solid matter is obtained; the solid matter is dissolved through hot water and then is enriched through macroporous adsorption resin; elution and recrystallization are performed, so that dihydroquercetin extract is obtained. The method has the main characteristics that the raw material is not required to be dried and directly used, the energy consumption is low, by adjusting the content of ethanol in the ethanol solution for extracting, arabinogalactan and dihydroquercetin are simultaneously extracted, the production cost is low, energy consumption is reduced, the yield of products is high, the process of purification performed by the macroporous adsorption resin is pollution-free, all solvents can be recycled, and the method is convenient for industrial scale production.

Description

Technical Field: [0001] The invention relates to the field of natural product chemistry, in particular to a method for simultaneously extracting arabinogalactan and dihydroquercetin from larch. Background technique: [0002] Arabinogalactan is a kind of long, highly branched hemicellulose composed of arabinose and galactose. Its main chain is galactan, and the branches are mainly arabinose side chains, passing β-1,3 The bond or β-1,6 bond is connected to the galactose chain. The content in larch is 10%-30%. Arabinogalactan is used in food and daily chemical industries as a mixture, emulsifier, stabilizer, sweetener, flavoring agent, and printing and mining industries. In recent years, arabinogalactan in larch wood has a unique role in the treatment of difficult and common diseases and a wide range of biological activities, without any toxic effects (it has been certified by the US FDA in 1974 and can be used in food). Administration, its medicine and health care functions are ...

AI Technical Summary

Problems solved by technology

This method has the following defects: although wood powder is used as raw material for sufficient extraction, the solvent consumption is large, and the residue is difficult to recycle; arabinogalactan and dihydroquercetin cannot be extracted in one step, which not only increases the cost but also lengthens The production cycle is shortened; without enrichment and purification, the purity of the crude product is low, so that the number of crystallization operations is more