The invention discloses a
brassica rapa alkali extract with anti-hypoxia activity as well as a preparation method and application of the
brassica rapa alkali extract. The method comprises the following steps: by taking
brassica rapa tuberous roots as a
raw material, rinsing,
slicing,
drying, crushing, extracting with a food-grade
calcium oxide alkaline solution, carrying out
centrifugal separation to obtain supernate, and carrying out
spray drying on the supernate to obtain the
brassica rapa alkali extract. The method is easy to operate, low in cost and high in extraction rate,
starch and crude
fiber auxiliary components in the
brassica rapa tubers can be removed to a large extent, the most important components with health-care functions of
brassica rapa are reserved, and the
biological activity of nutritional components of brassica rapa is kept. Results of evaluation and biochemical index determination of a normal-pressure closed experiment and a
sodium nitrite poisoning experiment show that the brassica rapa alkali extract can remarkably prolong the survival time of mice, improve the activity of
superoxide dismutase in the mice and reduce the content of
malondialdehyde, and shows a relatively good hypoxia tolerance effect. The alkali extract can be used for developing hypoxia-resistant functional foods such as tabletted candies and biscuits, and has a wide application prospect.