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Method for preparing xylooligosaccharide from corncobs through microwave-assisted hydrothermal treatment

A xylooligosaccharide and microwave-assisted technology, which is applied in the production of sugar, xylose, sugar production, etc., can solve the problems of uneven heating, long heating time, etc., achieve fast and high yield, and promote dissolution and hydrolysis , The effect of easy operation and control

Inactive Publication Date: 2015-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used reaction equipment for hydrothermal pretreatment is reactor, and the heating method is oil bath, sand bath, etc., which has the disadvantages of long heating time and uneven heating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing xylooligosaccharides by microwave-assisted hydrothermal treatment of corncobs, the specific steps are as follows:

[0026] (1) Pretreatment: crush the corncobs into 40-80 mesh particles, extract with ethanol-acetone mixture (volume ratio 1:1.8) for 6 hours, filter, wash with distilled water, and dry at 45°C for 8 hours. Carry out ball milling then, and ball milling time is 10 hours, and rotating speed is 300 revs per minute;

[0027] (2) Microwave-assisted hydrothermal reaction: put the sample after ball milling in step (1) and ultrapure water (mass ratio is 1:5) in a reaction kettle, and react under microwave after ultrasonication at 80KHz for 40 minutes, microwave radiation The power is 550W, the reaction temperature is 140°C, and the reaction time is 120 minutes;

[0028] (3) Post-processing: after the reaction is completed, cool, filter with suction, distill and concentrate the filtrate, and freeze-dry to obtain xylooligosaccharides.

[0029...

Embodiment 2

[0039] A method for preparing xylooligosaccharides by microwave-assisted hydrothermal treatment of corncobs, the specific steps are as follows:

[0040] (1) Pretreatment: crush the corncobs into 40-80 mesh particles, extract with ethanol-acetone mixture (volume ratio: 1:2) for 7 hours, filter, wash with distilled water, and dry at 55°C for 10 hours. Then carry out ball milling, the ball milling time is 12 hours, and the rotating speed is 400 revs per minute;

[0041] (2) Microwave-assisted hydrothermal reaction: put the sample after ball milling in step (1) and ultrapure water (mass ratio is 1:10) in a reaction kettle, and react under microwave after ultrasonication at 90KHz for 30 minutes, microwave radiation The power is 600W, the reaction temperature is 160°C, and the reaction time is 60 minutes;

[0042] (3) Post-processing: after the reaction is completed, cool, filter with suction, distill and concentrate the filtrate, and freeze-dry to obtain xylooligosaccharides.

[...

Embodiment 3

[0045] A method for preparing xylooligosaccharides by microwave-assisted hydrothermal treatment of corncobs, the specific steps are as follows:

[0046] (1) Pretreatment: crush the corncobs into 40-80 mesh particles, extract with ethanol-acetone mixture (volume ratio: 1:2.2) for 8 hours, filter, wash with distilled water, and dry at 65°C for 12 hours. Carry out ball milling then, and ball milling time is 14 hours, and rotating speed is 500 revs per minute;

[0047] (2) Microwave-assisted hydrothermal reaction: put the corn cob and water (mass ratio: 1:20) after ball milling in step (1) in the reactor, and react under microwave after ultrasonication at 100KHz for 20 minutes. It is 650W, the reaction temperature is 180°C, and the reaction time is 15 minutes;

[0048] (3) Post-processing: after the reaction is completed, cool, filter with suction, distill and concentrate the filtrate, and freeze-dry to obtain xylooligosaccharides.

[0049] After calculation, the yield of disacc...

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Abstract

The invention discloses a method for preparing xylooligosaccharide from corncobs through microwave-assisted hydrothermal treatment. The xylooligosaccharide is a functional glycopolymer formed by combining 2-6 xylose molecules by beta-1,4 glucosidic bonding; the method of the microwave-assisted hydrothermal treatment is that water is taken as a reaction solvent, and a complex three-dimensional network structure of cell walls of the corncobs is efficiently and rapidly broken by virtue of a microwave-assisted technology, so that hemicelluloses are dissolved out and subjected to hydrolysis reaction to generate the xylooligosaccharide; the specific steps for preparing xylooligosaccharide from the corncobs through the microwave-assisted hydrothermal treatment are as follows: crushing the corncobs into small granules, extracting by an organic solvent, filtering, washing by purified water, drying, and then carrying out ball-milling; adding a sample subjected to the ball-milling and the water in a reaction kettle, carrying out ultrasonic treatment and reacting in a microwave; and concluding the reaction, cooling, carrying out suction filtration to obtain filtrate, distilling and concentrating the filtrate, and carrying out freeze-drying to obtain the xylooligosaccharide. The method for preparing xylooligosaccharide from the corncobs through the microwave-assisted hydrothermal treatment has the advantages of being rapid, efficient, environmentally friendly, and the like.

Description

technical field [0001] The invention belongs to the field of xylo-oligosaccharide preparation, and in particular relates to a method for preparing xylo-oligosaccharide by microwave-assisted hydrothermal treatment of corncobs. Background technique [0002] In recent years, due to the excessive consumption of petrochemical resources by human beings, it has caused a series of political and economic problems while causing environmental pollution. Therefore, it is becoming more and more urgent to seek raw materials that can replace petrochemical resources to meet human's increasing energy demand. Biomass is regarded as one of the ideal renewable raw materials because of its wide range of sources, low price, and environmental friendliness. The preparation of high value-added chemicals and energy from biomass has become a goal pursued by scientists and is regarded as an effective way to solve the current energy crisis. [0003] Biomass is mainly composed of cellulose, hemicellulo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 任俊莉李慧玲孙润仓邓奥杰邓昊菅龙飞韦宛利
Owner SOUTH CHINA UNIV OF TECH
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