Purple potato is also called black potato, and its meat is purple to deep purple. Besides the nutrients of common sweet potato, it is also rich in selenium and anthocyanins. Purple sweet potato is one of the main raw materials of anthocyanin.
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 the skin. Vitamin C can make collagen 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 anthocyanins.
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 into powder, with beautiful color and rich 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 the tender leaves at the tip of the stem to the potato pieces, has certain health care functions and is a pollution-free, green and organic food at present.
Edible taboo
Purple sweet potato contains oxidase, which is easy to produce gas. Eating too much will lead to bloating, abdominal tumbling, burping and farting.
Purple potato has a high sugar content. Eating too much will stimulate gastric acid secretion and make people feel heartburn.
People suffering from dampness blocking the spleen and stomach and qi stagnation should be careful to eat.
Avoid eating purple potato alone, and eat it with high-quality protein food for more comprehensive nutrition.
Avoid eating raw. Purple potatoes should be cooked thoroughly before eating, because starch granules are difficult to digest without high temperature damage.
Selenium and iron in purple sweet potato are essential elements for anti-fatigue, anti-aging and blood-enriching. In particular, selenium, known as the "king of cancer", is easily absorbed by the human body, can retain serum, repair myocardium, enhance immunity, eliminate free radicals in the body, inhibit the synthesis of cancer DNA 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 corruption in intestinal cavity, discharge toxic substances and carcinogens in feces, keep defecation unobstructed, improve digestive tract environment and prevent gastrointestinal diseases. Besides 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.
Sweet potato, scientific name: Sweet potato is also called sweet potato, red taro, sweet potato, sweet potato, sweet potato, sweet potato (north), sweet potato (local languages), sweet potato, sweet potato, pillow taro, bamboo taro, sweet potato, fennel sweet potato, red-skinned sweet potato and sweet potato.
Sweet potato is rich in protein, starch, pectin, cellulose, amino acids, vitamins and various minerals, and has the reputation of "longevity food". The sugar content reached 15%-20%. Has anticancer, heart protecting, emphysema and diabetes preventing, and weight reducing effects. Li Shizhen's Compendium of Materia Medica in Ming Dynasty recorded that "sweet potato can tonify deficiency, strengthen spleen and stimulate appetite, and strengthen kidney yin", and said that people in the sea can eat for a long time. Chinese medicine regards sweet potato as a good medicine.
Sweet potato tuber contains 60%-80% water, 10%-30% starch, about 5% sugar and a small amount of protein, oil, cellulose, hemicellulose, pectin and ash. If 2.5Kg fresh sweet potato is converted into 0.5Kg grain, its nutritional components are higher than rice and flour except fat. In addition, sweet potato is rich in vitamins (carotene, vitamins A, B, C and E), and its starch is easily absorbed by the human body.
1. carotene
Vitamin A is known as "eye protection", which is transformed from carotene. Sweet potato is rich in carotene, which can provide rich vitamin A. The content of vitamin A can be as high as 40mg/ 100g of fresh sweet potato. Carotene can be converted into vitamin A after being absorbed by human body. Vitamin A can maintain normal visual function.
2. Edible fiber
The fiber content of sweet potato is 10 times that of rice flour. It has fine texture, does not harm the stomach, can accelerate the peristalsis of digestive tract, help defecation, clean the digestive tract, shorten the residence time of toxic substances in food in the intestine, reduce self-poisoning caused by constipation, reduce the concentration of carcinogens in the intestine, and prevent hemorrhoids and colorectal cancer. At the same time, cellulose can absorb some glucose, reduce the sugar content in blood, and help prevent diabetes.
3. Combination of sugar and protein
Sweet potato is rich in mucin, which is a mixture of polysaccharide and protein. It has a special protective effect on human body, and can keep the lubrication of digestive tract, respiratory tract, joint cavity and membrane cavity and the elasticity of blood vessels. Because this substance can prevent arteriosclerosis caused by the deposition of substances on the arterial wall, it can prevent the atrophy of connective tissue of organs such as liver and kidney, slow down the aging of human organs and improve the immunity of the body. Sweet potato also contains glycoprotein, which has good anti-mutation, hypolipidemic and immune enhancement effects.
4. Potassium
Sweet potato has high potassium content, which can alleviate the disadvantages caused by excessive salt intake. Potassium is also an important factor to protect the heart. Because potassium is an alkaline element, the pH value of sweet potato is 10. 1, which is a physiological alkaline food and has the function of neutralizing body fluids. Proper consumption of sweet potato is conducive to maintaining the acid-base balance of blood and to people's health, development and intellectual development.
5. Anticancer substances
There is a physiologically active substance called "deoxyepiandrosterone" in sweet potato, which can prevent colon cancer and breast cancer and greatly promote the activity of brain cells and endocrine glands, so it can delay mental decline and increase human resistance. It contains more carotene, lysine, plant fiber and dehydroepiandrosterone, which can prevent intestinal cancer and breast cancer.
Therapeutic value
Tuberous roots can be used for sugar, wine and alcohol, starch and pectin. The prepared starch can be used to make vermicelli and vermicelli and delicious dishes. Sweet potato is rich in essential nutrients such as starch, vitamins and cellulose, as well as mineral elements such as magnesium, phosphorus and calcium and linoleic acid. These substances can maintain the elasticity of blood vessels and are very effective in preventing and treating habitual constipation in the elderly. Unfortunately, most people think that eating sweet potatoes will make people fat and dare not eat them. In fact, on the contrary, sweet potato is an ideal diet food, its calorie is only 1/3 of that of rice, and because it is rich in cellulose and pectin, it has the special function of preventing sugar from transforming into fat.
Sweet potato is not only a healthy food, but also a good medicine for treating diseases. According to Compendium of Materia Medica, sweet potato has the effects of "tonifying deficiency and benefiting qi, strengthening spleen and stomach, and strengthening kidney yin". "Sweet potatoes are steamed, cut into sections, dried, and harvested as food, which is called potato food, which makes people live longer and less sick." Compendium of Materia Medica says that sweet potato can tonify the middle energizer, enrich the blood, warm the stomach and nourish the five internal organs. The Manual of Sweet Potato says that it has six medicinal values: treating dysentery and diarrhea; Treat wine accumulation and heat diarrhea; Treating damp-heat jaundice; Treating nocturnal emission with white turbidity; Treating blood deficiency and menstrual disorder; Treat infantile malnutrition. "Lu Chuan Materia Medica says that sweet potatoes can produce fluid to quench thirst and cure fever and thirst.
Sweet potato contains a lot of cellulose and pectin that are not easily destroyed by digestive enzymes, which can stimulate the secretion of digestive juice and gastrointestinal peristalsis, thus playing a laxative role. In addition, its rich β -carotene is an effective antioxidant, which helps to eliminate free radicals in the body. In fact, sweet potato is an ideal diet food.