Preparation method and application of water-insoluble xylan

Abstract

The invention discloses a preparation method and application of water-insoluble xylan. The preparation method comprises the following steps: extracting xylan from plant cell walls with an alkali liquid, removing most of the alkali liquid, and performing deep purification and bleaching treatment on a water-insoluble part, thereby obtaining edible water-insoluble xylan, wherein purities are separated and purified through multiple times of replacement and ultra filtration with diluted alkali water of a specific pH value, the pH value of a turbid emulsion to 8-13 with an acid, further replacementwashing is carried out through a centrifugation or micro-filtration membrane, no alcohol is used in the whole process, only a product of water-insoluble xylan is generated, soluble components are completely removed, and the purity content of the water-insoluble xylan can be up to 85-90%. The water-insoluble xylan prepared by using the method has the functions of promoting intestinal health, inhibiting starch decomposition or absorption, reducing serum cholesterol, reducing serum triglyceride, treating constipation, treating fatty livers and improving processing properties of rice and wheat flour foods.

Description

technical field [0001] The invention belongs to the field of food science, and relates to extracting xylan in plant cell walls with lye, removing most of the water-insoluble part of lye, and obtaining edible water-insoluble xylan after deep purification and bleaching treatment. sugar. Background technique [0002] The development of modern agriculture and animal husbandry has provided people with more cheap food and meat products. The human diet in the past few million years has been replaced by a high-fat, high-protein and increasingly refined diet. , directly lead to a serious shortage of dietary fiber components in human plant foods—that is, plant non-starch polysaccharides in foods, which has become an important cause of many metabolic diseases. [0003] The human body lacks dietary fiber hydrolytic enzymes and cannot directly hydrolyze, absorb and utilize dietary fiber in the small intestine. After ingestion, dietary fiber is mainly used as the basic carbon source for ...

AI Technical Summary

Problems solved by technology

[0013] Although patent 1 can prepare xylan in a large amount from agricultural wastes and provide raw materials for the production of xylooligosaccharides, xylose, and xylitol, there are several deficiencies. 1. The xylan extract has no effect on Alkali is recycled but directly neutralized, which has high cost and large amount of waste water; 2. The impurity separation and purification process completely depends on the alcohol precipitation method. The xylan purification and purification process is exposed to alcohol, and the removal of water-soluble impurities is not complete; 3. Water-soluble wood Glycans and water-insoluble xylans are not isolated and xylan purity is not addressed

[0014] Although the method for preparing plant xylan by improved alkaline extraction in Patent 2 effectively reduces the production cost of xylan products and significantly improves the social and economic benefits of industrial production of plant fiber xylan, there are several shortcomings and have not yet been developed. What is clear, 1. Only use the method of recycling the extract to save alkali consumption per unit of xylan, and there is no mention of the recovery of the lye in the extract; 2. It is not stated that the alkali concentration of the extract is reduced from 5%-7% to Whether the pH12.0 is removed by direct acid neutralization or ultrafiltration membrane replacement; 3. Under the initial condition of the extract pH12.0, the purpose of using soft water ultrafiltration membrane replacement is to remove residual alkali or to separate and purify impurities. Clear; 4. The purity of xylan after soft water ultrafiltration membrane replacement only increased from 70% of the traditional process to 75%, and the deep separation and purification process of impurities still relies on alcohol precipitation or washing; 5. There is no mention of water-soluble xylan and water How to separate insoluble xylan

[0015] In the above-mentioned patents, the purification of xylan adopts the traditional method of alcohol precipitation, but the alcohol precipitation method requires high equipment safety, large amount of alcohol loss, high cost, and incomplete removal of water-soluble impurities.

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