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Xylan nanocrystal and preparation method thereof

A xylan and nanocrystal technology, which is applied in the field of selective oxidative degradation of inorganic bases, can solve the problems of cumbersome preparation methods, particles without crystallinity and rigidity, and poor water dispersibility of xylan nanoparticles, and achieves a simple preparation process. , good biocompatibility, excellent water dispersibility

Active Publication Date: 2022-04-19
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of xylan nanomaterials in the above patents, on the one hand, requires the extraction of raw materials from plants through organic extraction. The preparation method is cumbersome, and the obtained xylan nanoparticles have poor water dispersibility, which limits their large-scale application.
The most important thing is that the above patents only control the shape of xylan into nanoparticles, and the particles do not have crystallinity and rigidity, so they are not xylan nanocrystals

Method used

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  • Xylan nanocrystal and preparation method thereof
  • Xylan nanocrystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 20 grams of periodic acid and 150 grams of deionized water into a 250 mL single-mouth reaction bottle wrapped in tin foil, and start stirring at room temperature at a stirring speed of 500 rpm.

[0027] (2) configure a potassium hydroxide solution with a mass concentration of 0.5 mol / L, slowly add it dropwise under stirring conditions, and adjust the pH to 10;

[0028] (3) 15 grams of xylan powder was directly added into a one-necked flask, and the temperature of the water bath was 20° C.; after 72 hours of stirring in the dark, the reaction was stopped and centrifuged, and the white solid in the lower layer was removed.

[0029] (4) The prepared solid powder is redispersed in deionized water, and after purification by dialysis, a xylan nanocrystal suspension can be obtained. The suspension was further freeze-dried to obtain 4.5 g of xylan nanocrystal powder with a yield of 30%.

[0030] Using dynamic light scattering and transmission electron microscopy, the s...

Embodiment 2

[0035] Repeat Example 1, with the following differences: the "potassium hydroxide" in the step (2) of Example 1 is changed to "potassium carbonate", and 100-200nm xylan nanocrystal suspension can be obtained, which can be produced after lyophilization. The yield was 25%, and the product had X-ray diffraction peaks of typical crystalline polymers.

Embodiment 3

[0037] Repeat Example 1, with the following differences: the "potassium hydroxide" in the step (2) of Example 1 is changed to "sodium hydroxide", and the 100-200nm xylan nanocrystal suspension can be obtained equally, freeze-dried The final yield is 5%, and the product has X-ray diffraction peaks of typical crystalline polymers, which shows that potassium hydroxide or potassium carbonate is more conducive to increasing the yield of nanocrystals.

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Abstract

The invention discloses a method for preparing xylan nanocrystals by taking industrial xylan as a raw material, which is characterized in that industrial xylan generated in a dissolving pulp preparation process of a papermaking enterprise is adopted as a raw material, and an amorphous region of the industrial xylan is selectively oxidized and degraded by periodate under the condition of an alkaline aqueous solution to obtain xylan nanocrystal powder; and the highest yield can reach 40%. The raw materials are easy to obtain, the reaction conditions are mild, and the prepared polysaccharide nanocrystals are rigid crystalline nanoparticles, have the size of 20-200nm, can be effectively and stably dispersed in water, and have good biocompatibility and degradability.

Description

technical field [0001] The invention relates to a xylan nanocrystal and a preparation method thereof, in particular to an inorganic alkali selective oxidation degradation technology. Background technique [0002] Polysaccharide nanocrystals refer to highly crystalline rigid nanoparticles extracted from animals and plants. Compared with inorganic nanoparticles, these polysaccharide nanocrystals obtained from nature are biodegradable, biocompatible, and controllable. Features and advantages such as structure and morphology and high specific surface area. At present, the raw materials of polysaccharide nanocrystals are mainly cellulose, starch or chitin, which are single, and it is urgent to develop new polysaccharide nanocrystals. [0003] Xylan is the main component of all types of wall hemicellulose in the secondary wall of dicotyledonous plants and symbiotic monocotyledonous plants, and it is also one of the main by-products of the pulp and paper industry in my country. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14C08J3/12C08L5/14
CPCC08B37/0057C08J3/12C08J2305/14
Inventor 彭锋郝翔王海荣吕保中
Owner BEIJING FORESTRY UNIVERSITY