Extended data
edibleness
It is rich in protein, starch, pectin, cellulose, amino acids, vitamins and various minerals, as well as selenium and anthocyanins. Purple sweet potato is rich in nutrition and has special health care function, in which protein amino acids are easily digested and absorbed by human body.
It is rich in vitamin A, which can improve vision and mucosal epithelial cells of skin. Vitamin C can make collagen protein synthesize normally and prevent scurvy. Anthocyanin is a natural powerful free radical scavenger.
Besides the nutrients of common sweet potato, it is also rich in selenium, iron and anthocyanin. Ranked first in the anti-cancer vegetables published by the National Vegetable Cancer Research Center of Japan. In addition, purple sweet potato can be peeled, dried and crushed and processed into powder, which is beautiful in color and rich in nutrition. It is an excellent raw material for food processing and can be used as the main ingredient or ingredient of various cakes.
At the same time, purple sweet potato will become one of the main raw materials of anthocyanin. Purple sweet potato, from tender leaves at the tip of stem to potato pieces, has certain health care function, and is a pollution-free, green and organic food at present.
Edible taboo
1, purple sweet potato contains oxidase, which is easy to produce gas. If you eat too much, you will have bloating, abdominal rolling, hiccups and farting.
2, purple sweet potato sugar content is high, eating too much can stimulate the secretion of gastric acid, making people feel heartburn.
3. People with dampness blocking the spleen and stomach and stagnation of qi should eat carefully.
4, avoid eating purple potatoes alone, should be eaten with high-quality protein food, more comprehensive nutrition.
5, avoid eating raw. Purple potatoes should be cooked thoroughly before eating, because starch granules are difficult to digest without high temperature damage.
Medicinal value
Selenium and iron in purple sweet potato are essential elements for anti-fatigue, anti-aging and blood-enriching. In particular, selenium is known as the "king of cancer", which is easily absorbed by human body, and can stay in serum, repair myocardium, enhance immunity, scavenge free radicals in the body, inhibit the synthesis of DNA in cancer cells and the division and growth of cancer cells, and prevent the occurrence of cancer diseases such as gastric cancer and liver cancer.
Purple sweet potato is rich in cellulose, which can increase the volume of feces, promote gastrointestinal peristalsis, clean up mucus, gas accumulation and putrefaction in intestinal cavity, discharge toxic substances and carcinogens in feces, keep the stool smooth, improve the digestive tract environment and prevent gastrointestinal diseases.
In addition to the nutrients of common sweet potato, it also contains polysaccharides and flavonoids, and is also rich in selenium and anthocyanins, which has certain functions of preventing hypertension, relieving liver dysfunction and resisting cancer.
Yoshimot et al. used Salmonella typhimurium TA98 to evaluate the antimutagenic activity of water extracts of four different colors of sweet potatoes, and found that purple sweet potato anthocyanins can effectively inhibit the mutagenic effect caused by heterocyclic amines. Two anthocyanins isolated from purple sweet potato have strong antimutagenic effect.
Animal experiments showed that purple sweet potato beverage containing a large amount of anthocyanins could significantly inhibit the increase of glutamate oxaloacetate transaminase (GOT) and glutamate pyroglucuronate transaminase (GTP) in serum of rats with liver injury induced by carbon tetrachloride, and also inhibited the increase of thiobarbituric acid (TBA) reactant and oxidized lipoprotein in serum and liver to some extent.
However, the yellow-fleshed sweet potato beverage cannot be given to rats by Fredenck et al. for 4 weeks, 5 days a week, and 2.5mL of 5% ethanol aqueous solution /kg body weight containing 1%, 5% and 10% anthocyanins respectively;
After giving rats 0.5mL CCl4 /kg body weight18 hours, the serum levels of aspartate and alanine aminotransferase were significantly lower than those in the control group, indicating that anthocyanins can inhibit acute liver injury induced by CCl4.
References:
Purple potato. Baidu encyclopedia