Method for preparing xylooligosaccharide from biomass raw material and application of xylooligosaccharide in preparation of feed additive

Abstract

The invention discloses a method for preparing xylooligosaccharide from a biomass raw material and application of the xylooligosaccharide to preparation of a feed additive, and the preparation method comprises the following steps: removing impurities from the biomass raw material containing lignocellulose, crushing, adding water, uniformly mixing, adding into a high-pressure reaction kettle, carrying out subcritical hydrothermal hydrolysis reaction at 170-220 DEG C under the condition of homogeneous stirring, filtering, washing, and drying to obtain the xylooligosaccharide. And after the reaction is finished, rapidly cooling to normal temperature, carrying out solid-liquid separation, collecting a hydrolysis mixed solution, and finally, carrying out post-treatment. The preparation of the xylooligosaccharide can be completed through a one-step subcritical hydrothermal hydrolysis reaction, and the particle size of the crushed biomass raw material and the subcritical hydrothermal hydrolysis reaction conditions are synergistically optimized, so that the yield of the xylooligosaccharide can be remarkably improved, and the generation of byproducts can be effectively reduced; the prepared xylooligosaccharide is rich in polysaccharide active ingredients, so that the utilization of the feed by animals can be effectively promoted; in the preparation process, the use of auxiliary materials such as maltodextrin, corn starch and beta-cyclodextrin is avoided, and the production cost can be remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of xylo-oligosaccharides, and more particularly relates to a method for preparing xylo-oligosaccharides by using biomass raw materials and its application in the preparation of feed additives. Background technique [0002] Xylo-oligosaccharide, also known as Xylooligosaccharide (XOS), is a mixture of oligosaccharides composed of 2-7 xylose units linked by β-1,4 glycosidic bonds (GB / T 23747-2009). As a super prebiotic, xylo-oligosaccharide has the functions of low calorie, good stability, and inhibition of intestinal inflammatory factors. It is 10-20 times of prebiotics and is an important functional food and feed additive. [0003] At present, the main preparation methods of feed-grade xylo-oligosaccharides include pulverization, physical and chemical pretreatment, acid-base neutralization, enzymatic hydrolysis, desalination, decolorization and concentration, etc., which are complicated in pr...

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Problems solved by technology

[0003]At present, the main preparation methods of feed-grade xylo-oligosaccharides include crushing, physical and chemical pretreatment, acid-base neutralization, enzymatic hydrolysis, desalination, decolorization and concentration, etc. There are problems such as complex process, long production cycle, high energy consumption and large amount of reagents, and the obtained xylooligosaccharides still need to add a large amount of maltodextrin, corn starch and β-cyclodextrin and other auxiliary materials to be further made into feed additives

[0004] In addition, in the prior art, the raw material for the preparation of feed grade xylo-oligosaccharides is mainly corn cobs, and there are agricultural and forestry wastes such as straws and branches and rice husks in some areas. , Bagasse and other agricultural processing wastes are used as raw materials to prepare feed grade xylooligosaccharides, but there is no report on the preparation of feed grade xylooligosaccharides from reed and Nandi biomass

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