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Preparation method of refining xylan

A technology for xylan and wood purification, applied in oligosaccharides and other directions, can solve the problems of high cost and sewage generation, and achieve the effect of high efficiency and strong operability

Inactive Publication Date: 2005-10-26
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of high cost and sewage production in the existing xylan preparation methods, the present invention provides a low-cost, pollution-free xylan extraction and refining method. On this basis, the present invention also discloses further improvement of the product quality method

Method used

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  • Preparation method of refining xylan
  • Preparation method of refining xylan
  • Preparation method of refining xylan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Shake the non-mildew straw to remove dust and dry it and grind it into 1-20mm long shredded grass;

[0038] (2) Weigh 10 kg of grass silk, add 50 l of 2.5% KOH solution, soak for 4 hours, cook for 15-30 minutes, squeeze out the solution; minutes, squeeze out the solution. Combine the two parts of the extruded liquid, and centrifuge at a centrifugal force of 8000g for 30min to obtain about 50l of the supernatant;

[0039] (3) Add 150L of 95% ethanol, adjust the pH value to 6.0 with phosphoric acid after mixing, centrifuge at 8000g for 15min, and collect the precipitated crude xylan;

[0040] (4) Add 50 l of 95% ethanol to the coarsely extracted xylan precipitate, break it up and stir at low speed for 2 hours to fully balance it, then centrifuge at 8000 g for 15 min to collect the precipitate; add ethanol and repeat the above process twice to obtain the product , take a product sample and analyze it by HPLC as figure 2 As shown, where HPLC analysis column: Sugarpa...

Embodiment 2

[0041]Embodiment 2: basically the same as Example 1, the difference is that with 10kg broken wheat straw, 30L 1% NaOH solution, 80% ethanol 50L crudely extract xylan;

Embodiment 3

[0042] Embodiment 3: basically the same as Example 1, the difference is that 10kg of bagasse is used as a raw material, 100L of 5% KOH solution is used to extract alkali-soluble substances, and 80L of alkali extract is obtained, which is then concentrated to 40L; then 85% ethanol is added 200L crude xylan extraction.

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Abstract

The present invention relates to a preparation method for purifying xylan. Said method includes the following steps: A. using alkali solution to extract alkali soluble substance from raw material; B. adding ethyl alcohol to alkali extraction solution, uniformly mixing them, using acid to regulate solution pH, making centrifugalization and filtration and collecting precipitate so as to obtain coarsely-extracted xylan; and C. using ethyl alcohol to wash crude xylan at least once so as to obtain the precipitate, namely, purified xylan.

Description

technical field [0001] The invention relates to the field of xylan preparation, in particular to a preparation method for purifying xylan. Background technique [0002] Xylan widely exists in nature and accounts for 20-30% of the dry weight of straw. It is an inexhaustible carbohydrate that needs to be developed and utilized urgently. People's interest in xylan in the early years is that it is a renewable resource that can replace grain as a fermentation raw material or animal feed. With the development of science, people's awareness of health care has been continuously strengthened, and the demand for health care products has continued to increase; people's greater interest today lies in the preparation of products with health functions from xylan, such as xylooligosaccharides, xylose or xylitol etc. Xylooligosaccharides (2-7 xylose short chains) produced by xylan degradation are good functional oligosaccharides. Compared with other oligosaccharides, xylooligosaccharides ...

Claims

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Application Information

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IPC IPC(8): C07H3/06
Inventor 邵蔚蓝邵志忠
Owner NANJING NORMAL UNIVERSITY
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