The invention discloses a golden camellia leaf extract and application thereof. The extract comes from
plant leaves of golden camellia, and the iconic component tea
polyphenol of the extract accounts for 3.5-20
mass percent. The preparation method comprises the following steps: adding water into the
plant leaves of golden camellia, extracting, filtering, adding water into the filter residue for extracting for 1-5 times, filtering, merging the obtained filtrate, and
drying under reduced pressure, thereby obtaining a product, wherein the step of adding water into the
plant leaves and the filter residue for extracting comprises the following sub-steps: adding water in an amount of 5-30 times that of the weight of the material, heating, closing the fire after the solution is boiling, performing hot dipping for 10-180 minutes, heating and closing the fire after the solution is boiling, and performing hot dipping for 1-180 minutes. The extract mainly refers to a
polyphenol extract of golden camellia leaves, and the preparation method is simple and feasible and is suitable for industrial production; and moreover, the
polyphenol extract of golden camellia leaves is obvious in effect of reducing
blood sugar, can be used for preparing medicines, foods and health products for reducing
blood sugar or preparing medicines for treating related diseases caused by
abnormal glucose tolerance,
insulin resistance,
metabolic syndrome and primary hyperglycemia and is wide in application range.