The invention relates to a purple jade extract as well as a preparation method and application thereof, and belongs to the field of
plant extracts. According to the purple jade extract as well as the preparation method and the application thereof provided by the invention, the extraction of
flavonoid substances rich in a
dendrobium devonianum variety'purple jade 'is completed for the first time, the extract with the total
flavonoid content of more than or equal to 17% is obtained, and the condition that the
dendrobium devonianum variety'purple jade' contains two substances, namely
rutin and vicenin-2, is determined through qualitative and quantitative analysis. Through
verification, the purple jade extract disclosed by the invention has a good
antioxidant function, and the
total antioxidant capacity of the purple jade extract is close to that of a water-soluble
vitamin E analogue Trolox (6-hydroxy-2, 5, 7, 8-tetramethylchromane-2-
carboxylic acid) with the
equivalent weight of 4mM. According to the purple jade extract as well as the preparation method and the application thereof, a scientific basis is provided for application of purple jade in related directions, and the purple jade extract can be used as an intermediate for development of purple jade series products (such as in the fields of
medicine, food, daily necessity development and the like).