Oligodextrose and preparation method thereof

A glucose and oligomerization technology, applied in the field of oligosaccharides, can solve problems such as unfavorable commercial applications, achieve the effects of mature extraction technology, mild reaction conditions, and overcome low product concentration

Pending Publication Date: 2021-11-12
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the concentration of the obtained oligosaccharides is only 26.2g / L. Increasing the dosage of cellulose raw materials will lead to the generation of a large amount of organic acids, which will increase the acidity of the system, thereby triggering the degradation of oligosaccharides, and limiting the concentration of oligosaccharides below 55g / L.
Therefore, the technology is not conducive to commercial application

Method used

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  • Oligodextrose and preparation method thereof
  • Oligodextrose and preparation method thereof
  • Oligodextrose and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0039] Preparation of 60wt.% LiBr salt solution: 12g of water was added to 18g of anhydrous LiBr, and stirred until completely dissolved to obtain a 60wt.% lithium bromide solution.

[0040] The preparation method of highly cross-linked resin can refer to the literature (RSC Advances, 2020, 10, 34732-34737 and Macomolecules). g of azobisisobutyronitrile, 1g of gelatin, and 15g of polydimethyldiallylammonium chloride were added to 300mL of water, at 40°C, N 2 Stir in the atmosphere for 1 h to dissolve, then increase the temperature to 75°C, and react for 8 h. After the reaction was over, the resulting solid was washed with ethanol and then dried, and then 5g of solid, 40mL of dichloroethane, 2g of FeCl 3 Add it into a glass reaction bottle, stir at room temperature for 2 hours, then raise the temperature to 80°C, and react for 12 hours. After the reaction, the solid residue was obtained by filtration, washed 5 times with acetone containing 4wt.% hydrochloric acid concentratio...

Embodiment 1

[0042] Weigh 500 mg of cellulose and a certain amount of highly cross-linked resin, put them into a thick-walled glass reaction tube with a volume of 15 mL, add 5 g of LiBr salt solution with a concentration of 60 wt.%, put them into an oil bath at 130 ° C, and take them out after 4 hours of reaction. Cooled in circulating water, quantitatively analyzed by liquid chromatography, the obtained results are as follows Figure 3a , Figure 3b shown.

[0043] Depend on Figure 3a , Figure 3b It can be seen that under mild conditions, cellulose can be directional converted into oligosaccharides. Along with the increase of resin dosage, the yield and concentration of oligosaccharides are gradually increased, and when the dosage ratio of resin and cellulose is from 0 to 1:1, oligosaccharide yield is promoted to 90.4% by 26.3% (see Figure 3a ), the oligosaccharide concentration increased from 42.1g / L to 144.6g / L (see Figure 3b ).

Embodiment 2

[0045]Take 500mg of cellulose and 250mg of resin, put them into a 15mL thick-walled glass reaction tube, add 5g of LiBr solution with a concentration of 60wt.%, mix them, put them into an oil bath at 130°C, take them out after reacting for different times, and cool them in circulating water , quantitatively analyzed by liquid chromatography, the results are as Figure 4 shown.

[0046] Depend on Figure 4 It can be seen that as the reaction time increases, more and more cellulose is converted into oligosaccharides. After 4 hours of reaction, the yield of oligosaccharides reaches 78.4%. Further prolonging the reaction time will cause the hydrolysis of oligosaccharides and reduce its yield. .

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Abstract

The invention discloses oligodextrose and a preparation method thereof, and belongs to the field of oligosaccharides. The preparation method comprises the following steps of: mixing polysaccharide, an adsorbent and a salt solution, and reacting to obtain the oligodextrose, wherein the adsorbent is one of a resin material and an activated carbon material or above, the polysaccharide is one of cellulose and chitosan or above, and the salt solution is one of a LiBr solution, a LiCl solution, a ZnCl2 solution and a ZnBr2 solution or above. According to the preparation method, selective conversion of cellulose to oligosaccharide with a specific polymerization degree (2-20) is realized, and the selectivity of the obtained oligosaccharide reaches 90% or above. Meanwhile, the oligosaccharide concentration can be increased to 200 g/L or above, and the highest oligosaccharide concentration reaches 247.1 g/L. In addition, the resin material adopted by the invention can be oxidized and regenerated through hydrogen peroxide to keep stable properties.

Description

technical field [0001] The invention belongs to the field of oligosaccharides, and in particular relates to an oligosaccharide and a preparation method thereof. Background technique [0002] Glucose oligosaccharides with a degree of polymerization of 2-20 are an important raw material for prebiotics. This type of oligosaccharide cannot be transformed and utilized by the upper digestive tract of the human body, but can be transformed and absorbed by probiotics such as bifidobacteria in the intestinal tract, thereby regulating the intestinal tract environment for the growth of colonies, inhibit the growth of harmful bacteria, improve the body's ability to absorb minerals, and protect human health. In recent years, the market expansion of prebiotic oligosaccharides at home and abroad has been extremely rapid, and oligosaccharides have also attracted more and more attention as a high value-added chemical. [0003] The traditional oligosaccharide preparation technology is mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H1/06C07H3/06C08B37/02B01J20/26
CPCC07H1/06C07H3/06C08B37/0024B01J20/267
Inventor 马巧智刘启予蒋恩臣官铭钊林健颖
Owner SOUTH CHINA AGRI UNIV
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