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Crystallization method of xylobiose

A xylobiose and crystallization technology, applied in the field of preparing high-purity crystals, can solve the problems of high energy consumption, low crystallization yield and the like, and achieve the effects of improving crystallization yield, good gloss and good appearance

Inactive Publication Date: 2009-07-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the purity of xylobiose in this method reaches more than 99%, the concentrated crystallization technology is adopted, and the energy consumption is relatively high; at the same time, the crystallization yield is low, only 34%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Adjust 10L of 10g / L xylobiose solution to pH 4.0 with hydrochloric acid, add 10g of magnesium chloride, and slowly add 7L of methanol (flow speed: 10mL / min) at 30°C and 150r / min, after the crystallization is complete , the suspension was filtered, the white solid was washed with methanol, and dried in vacuo to obtain xylobiose crystals, the water content was 17.4%, the xylobiose content was 98.1% (according to anhydrous!), and the crystallization yield was 85%. .

Embodiment 2

[0020] Adjust 100L of 50g / L xylobiose solution to pH 5.0 with hydrochloric acid, add 4000g of potassium chloride, slowly add 150L of acetone at a stirring speed of 500r / min (flow speed is 300mL / min), and stir at a constant temperature of 20°C until the crystallization is complete. The suspension was filtered, the white solid was washed with acetone, and dried in vacuo to obtain xylobiose crystals with a water content of 20.1%, a xylobiose content of 99.1% (calculated as anhydrous!), and a crystallization yield of 81%.

Embodiment 3

[0022] Adjust 50L of 100g / L xylobiose solution to pH 6.0 with sodium hydroxide, add 4000g of sodium chloride, and slowly add 450L of ethanol at a stirring speed of 100r / min (flow speed is 500mL / min), at 10°C Stir at constant temperature until crystallization is complete. The suspension was filtered, the white solid was washed with ethanol, and dried in vacuo to obtain xylobiose crystals with a moisture content of 18.7%, a xylobiose content of 96.5% (anhydrous basis!), and a crystallization yield of 93%.

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Abstract

The invention discloses a method for crystallizing xylobiose, namely 1 to 80g of inorganic salt and 0.67 to 19L of organic solvent are added into each liter of xylobiose solution with a pH value of between 4.0 and 9.0 and a concentration of between 10 and 200g / L, the crystallization temperature is controlled to be between 10 and 40 DEG C, the stirring rotating speed is controlled to be between 10 and 500r / min, the filtration is performed after the crystallization is finished, the same organic solvent is used to wash, and xylobiose crystals can be obtained after vacuum drying. The method has steady crystallization yield, improves the quality of products, improves the appearance and the particle homogeneity of the products, has simple and convenient operation and good repetitiveness, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of crystallization, and in particular relates to a method for preparing high-purity crystals from an aqueous solution of xylobiose. Background technique [0002] Xylooligosaccharides are oligosaccharides formed by connecting 2 to 10 xylose molecules through β-1,4-glycosidic bonds, also known as xylooligosaccharides. Xylooligosaccharide is an important member of the functional oligosaccharide family. Its sweetness is lower than that of sucrose and glucose, about 40% of that of sucrose, and comparable to that of maltose. [0003] Xylo-oligosaccharides have significant proliferative ability of bifidobacteria, which can rapidly multiply beneficial bacteria such as bifidobacteria, thereby inhibiting the growth of harmful bacteria in the intestinal tract; it is difficult to be digested and absorbed, and cannot be absorbed by saliva, pancreatic juice, and small intestinal villous glands. Decomposition of mass flui...

Claims

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Application Information

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IPC IPC(8): C07H3/04C07H1/06
Inventor 李鑫欧阳嘉余世袁勇强宋向阳徐勇陈牧连之娜
Owner NANJING FORESTRY UNIV
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