Use the characteristics and chemical properties of anthocyanins rich in purple sweet potatoes to identify them. Anthocyanins are soluble in water and are extremely chemically unstable. They turn red when exposed to acid, blue when exposed to alkali, and purple when neutral. You can use vinegar water and baking soda water at home to test whether the purchased purple sweet potato is dyed purple sweet potato.

The nutritional value of purple sweet potato:

1. Rich in protein, starch, pectin, cellulose, amino acids, vitamins and various minerals, as well as selenium and anthocyanin. Purple sweet potato is rich in nutrients and has special health care functions. The protein and amino acids in it are easily digested and absorbed by the human body. The rich vitamin A can improve vision and skin mucosal epithelial cells. Vitamin C can normalize the synthesis of collagen and prevent and treat the occurrence of scurvy. Anthocyanins are natural and powerful free radical scavengers.

2. In addition to the nutrients of ordinary sweet potatoes, it is also rich in selenium, iron and anthocyanins. It ranks first among the anti-cancer vegetables announced by Japan’s National Vegetable Cancer Research Center. In addition, purple sweet potato can also be peeled, dried, crushed and processed into powder. It has beautiful color and rich nutrition. It is an excellent food processing raw material and can be used as the main ingredient or ingredient of various pastries.

At the same time, purple sweet potato will also become one of the main raw materials of anthocyanins. Purple sweet potato has certain health-care functions from the stem tips to the tender leaves to the potato pieces. It is currently a pollution-free, green and organic food.

Extended information:

Taboos for eating purple sweet potato:

1. Avoid eating purple sweet potato alone. It should be eaten with high-quality protein foods for more comprehensive nutrition. .

2. Avoid eating it raw. Purple sweet potatoes must be cooked thoroughly before eating, because the starch grains are difficult to digest without being destroyed by high temperatures.

3. Avoid eating together with tomatoes. Tomatoes contain a lot of acids, which can form indigestible substances with purple sweet potatoes in the stomach, which can easily lead to abdominal pain, diarrhea and indigestion.

4. Purple sweet potato should not be eaten with persimmons, which will not only affect the absorption of nutrients, but also form stones and easily cause gastric bleeding.

5. Purple sweet potato should not be eaten with white wine, crabs, and bananas. Because purple sweet potato contains low calories, it can easily cause abdominal pain and diarrhea.

6. People who are allergic to purple sweet potatoes should not eat it. Purple sweet potato may also become an allergen. If you are allergic to purple sweet potato, eating purple sweet potato may cause allergic symptoms such as skin redness and swelling, frequent diarrhea, indigestion, headache, sore throat, asthma, etc. Therefore, such people should also Avoid eating purple sweet potatoes.

China’s official website for combating infringement and counterfeiting – How to identify fake purple sweet potatoes?

Baidu Encyclopedia - Purple Sweet Potato

People's Daily Online - Inventory of the efficacy and functions of purple sweet potato. Pay attention to these 6 eating taboos