The invention discloses an extraction method for
Nigella saliniva seed
polysaccharide. The method comprises the following concrete steps of: decocting
Nigella saliciva seeds with water, carrying out filtering, adding absolute ethyl
alcohol into a filtrate until a final concentration is 70 + / -5 V%, carrying out standing, collecting a precipitate, removing
protein by a Sevage method after water
dissolution of the precipitate, taking a supernatant, adding absolute ethyl
alcohol until a final concentration is 70 + / -5 V%, performing standing, washing a precipitate, and freeze-
drying the washed precipitate to obtain the
Nigella saliniva seed
polysaccharide. Experiments show that the Nigella saliniva seed
polysaccharide can significantly reduce the levels of FBG, glycated
serum protein (GSP),
triglyceride (TG),
total cholesterol (TC), low-density
lipoprotein cholesterol (LDL-C), TNF-alpha, IL-6 and IL-1 beta of mice, and can significantly reduce the levels of FBG, glycated
serum protein GSP,
triglyceride TG,
total cholesterol TC, low-density
lipoprotein cholesterol LDL-C and increase the expression levels of
insulin (INS), high-density
lipoprotein cholesterol (HDL-C) and total antioxidantcapacity (T-AOC). The results of intestinal
flora composition analysis show that the abundance of the f_
Microbacterium_Unclassified bacterial
genus and the
Bacteroides genus in a model group is obviously reduced, and the Nigella saliniva seed polysaccharide remarkably increases the abundance of the f_
Microbacterium_Unclassified bacterial
genus and the
Bacteroides genus, which indicates that the Nigella saliniva seed polysaccharide can improve the abnormal state of diabetic mice by regulating intestinal microbiota, and is an ideal
medicine for treating type 2
diabetes mellitus.