Preparation method of dioscorea opposita thunb slime polysaccharide and resistant starch

Abstract

The invention belongs to the field of processing agricultural products, and particularly relates to a preparation method of dioscorea opposita thunb slime polysaccharide and resistant starch. The preparation method of dioscorea opposita thunb slime polysaccharide and resistant starch comprises the following steps: washing and peeling fresh dioscorea opposita thumb, protecting color, slicing, crushing, homogenizing, putting homogenate into a high-pressure pulsed electric field for extraction, adding water into the treated dioscorea opposita thumb homogenate and performing high-speed centrifugation, and centrifuging starch residues at the lower layer for three times; respectively collecting supernatant and lower-layer starch residues obtained through repeated centrifugation; filtering the centrifuged supernatant through a molecularly imprinted membrane and eluting with water, to obtain a dioscorea opposita thumb slime polysaccharide solution, concentrating and drying to obtain dioscoreaopposita thumb slime polysaccharide, adding water into the lower-layer starch residues and performing membrane filtration, preparing a starch emulsion after filtering, performing pressure-heating treatment in an autoclave and then adding pancreatic amylase and pullulanase for enzymolysis, performing enzyme denaturing and performing refrigeration and ageing, hot-air drying, pulverizing and screening to obtain the dioscorea opposita thumb resistant starch.

Description

technical field [0001] The invention belongs to the field of agricultural product processing, and specifically relates to a preparation method of yam mucus polysaccharide and resistant starch. Background technique [0002] Chinese yam is the root tuber of Dioscorea opposita plant in Dioscorea family, and it is a medicinal and edible plant. Chinese yam contains crude fiber, pectin, polysaccharide, amylase, mucus, glycoprotein, allantoin, saponin, yam, choline, fatty acid and other components, as well as trace amounts of iodine, calcium, iron and phosphorus that are indispensable to the human body. It has the functions of nourishing the spleen and nourishing the stomach, promoting body fluid and benefiting the lungs, stopping diarrhea and dampness. [0003] Yam polysaccharide is one of the important active ingredients of yam, which has the functions of lowering blood sugar, improving gastrointestinal function, regulating immune system, and anti-aging. At present, a large num...

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Problems solved by technology

[0009] Chinese patent 201710573545.5 provides a method for preparing cassava resistant starch. The steps are as follows: take cassava starch, heat-press, cool to room temperature, add heat-resistant α-amylase to react, then cool to room temperature for ultrasonic treatment, let it stand, and bake Drying, grinding, and sieving to obtain the cassava resistant starch, the preparation method of the invention is used to solve the problem of low yield of resistant starch in the existing preparation technology

There are few reports on the continuous and integrated production of viscous polysaccharides and resistant starch of Chinese yam