Process for extracting L-arabinose from acacia gum by two-column method

A technology of gum arabic and arabinose, applied in the direction of monosaccharide, oligosaccharide, etc., can solve the problems of complex operation, high difficulty, high technical requirements for refining and purification, and achieve the effect of simple process, low production cost and high purity

Inactive Publication Date: 2002-10-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The primary hydrolysis products produced by most of the above methods contain various sugars, and this type of mixture has high requirements for refining and purification technology, so it is not conducive to separation and purification. Generally, cation exchange resins, diatomite mixed ion exchange resins, anion Separation and purification of exchange resins, strongly acidic cation exchange resins, zeolite molecular sieves, and aminopropyl-bonded silica gel impregnated with sodium dihydrogen phosphate, etc., but it is very difficult
Due to complex operations such as high-temperature separation or little effect, the yield and yield of L-arabinose extracted are very low, and cannot be applied to industrial production.

Method used

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Examples

Experimental program
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Effect test

example 1

[0020] Take 50g of gum arabic, put it into a pre-weighed 1000ml four-neck bottle, add 500ml of 1% hydrochloric acid, heat, control the temperature at 55°C, stir and reflux for about 3h. At the end of the reaction, weigh approximately an equivalent amount of Ca(OH) to the acid 2 ·8H 2 O is added into water equivalent to twice its weight, and heated to above 70°C, and slowly added to the hydrolyzed solution under stirring conditions to neutralize the solution to neutrality. The neutralized solution was kept at about 60°C, and subjected to vacuum distillation, and 5 times the volume of methanol was added to the residue as an extractant, and refluxed for 3 hours while stirring. After the reflux, the solution was left to stand for more than 6 hours, filtered, and the filtrate was distilled. Add about 200mL of acetic acid to the residue, heat to 80°C to dissolve, filter to remove insoluble matter, let it stand and cool to room temperature, precipitate precipitate and bake at about...

example 2

[0021] Take 50g of gum arabic, put it into a pre-weighed 1000ml four-necked bottle, add 500ml of 2.5% hydrochloric acid, heat, control the temperature at 65°C, stir and reflux for about 4h. At the end of the reaction, weigh approximately an equivalent amount of Ca(OH) to the acid 2 ·8H 2 O is added into water equivalent to twice its weight, and heated to above 70°C, and slowly added to the hydrolyzed solution under stirring conditions to neutralize the solution to neutrality. The neutralized solution was kept at about 50°C, and subjected to vacuum distillation, and 5 times the volume of 80% ethanol was added to the residue as an extractant, and refluxed for 3 hours while stirring. After the reflux, the solution was left to stand for more than 6 hours, filtered, and the filtrate was distilled. Add about 50mL of acetic acid to the residue, heat to dissolve, let stand to cool to room temperature, filter to remove insoluble matter, and bake at about 60°C for about 4 hours to obt...

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PUM

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Abstract

A two-column process for extracting L-arabinose from acacia gum includes hydrolyzing in inorganic acid, alkali neutralizing, extracting in alcohol, filtering, dissolving in acetic acid at 60-90 deg.Cto obtain coarse L-arabinose mixture, separating by the first column to obtain the mixture of pure rhamnose and mixture of L-arabinose and galactose, and separating by the second column to obtain pure L-arabinose. The cellulose, alumina, starch, silica gel and developing solvent are filled in columns. Its advantages are low cost and high yield and purity of product.

Description

technical field [0001] The invention relates to a method for extracting L-arabinose from gum arabic by a two-column method. It belongs to the technology of preparing L-arabinose from gum arabic. Background technique [0002] L-arabinose is mainly used as a pharmaceutical intermediate for the preparation of anticancer, antiviral, and cardiovascular disease drugs; it can also be used as a biochemical reagent for the preparation of bacterial culture media and for the synthesis of spices. [0003] L-arabinose usually exists in the form of hemicellulose L-arabinan and L-arabinan-D-galactose, usually found in gum bean, cherry gum, pear gum, rye, wheat bran, sugar beet pulp And larch wood, corn husk, etc. L-arabinose is obtained by hydrolyzing these natural raw materials and post-processing them. Existing preparation method is as follows: [0004] Using Arabic PYCNANTHA gum as raw material, use 0.01N H 2 SO 4 After hydrolysis, use anionic IR-4B (OH) resin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H3/06
Inventor 冯亚青刘燕张晓东张卫红孟舒献
Owner TIANJIN UNIV
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