The invention discloses
dandelion polysaccharide with high hypoglycemic activity as well as a preparation method and application thereof. The preparation method comprises the following steps:
drying, crushing and sieving whole
dandelion plants,
degreasing and decolorizing, extracting and concentrating the obtained pretreated
powder by hot water, carrying out graded
alcohol precipitation to obtain crude
dandelion polysaccharide, screening the crude dandelion
polysaccharide with optimal activity by virtue of
oxidation resistance and in-vitro
blood sugar reduction, deproteinizing, and separating and purifying by virtue of DEAE-52 and
Sephadex G-200 to obtain relatively uniform dandelion polysaccharide. The dandelion polysaccharide can remarkably inhibit the activity of alpha-
amylase and alpha-
glucosidase, improve the glucose consumption capacity of IR-HepG2 cells (an
insulin resistance model) and effectively reduce fasting blood glucose of type 2
diabetes mellitus mice, can be used for developing and preparing hypoglycemic products, and meanwhile, can be used for preparing hypoglycemic products. The
fine structure characteristics of the dandelion polysaccharide with the hypoglycemic activity are further analyzed, and reference and data support are provided for development and application of dandelion and polysaccharide.