The invention relates to a
euonymus alatus extract and a preparation process, a
quality control method, the blood-
sugar-reducing activity of the
euonymus alatus extract and application of the
euonymus alatus extract to the preparation of products for reducing
blood sugar. The euonymus alatus extract can be prepared by any one of a
solvent extracting method, a macroporous adsorbent resin method, a
supercritical fluid extraction method,
column chromatography, liquid-liquid counter-current partition
chromatography and the like or a combination of the methods. The prepared euonymus alatus extract comprises the following active ingredients: flavonoids,
phenols, alkaloids, triterpenoids, sterides, organic acids and polysaccharides, wherein the flavonoids and the
phenols are main ingredients, and the content of general
flavones is between 5 and 100 weight percent. Blood-
sugar-reducing experiments of mice which suffer from diabetes caused by mesoxyalyurea prove that the raising of the
blood sugar after the
intragastric administration of glucose is inhibited effectively, and the euonymus alatus extract has a certain
treatment effect on experimental diabetes caused by
pancreas islet beta cell injury caused by the mesoxyalyurea, and can be applied to the preparation of the products for reducing the
blood sugar.