1. The physical principles are different. :

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.

2. The experimental results are different:

1. First, find two transparent plastic cups, fill them with water, and then pour vinegar into the left cup (because there is no white vinegar , so I could only experiment with rice vinegar) and then put some baking soda on the right side of the cup. In this way, the experimental water is ready.

2. Then, I found a purple potato and cut it into pieces for the experiment. In order to maintain the moisture of the cut surface of the purple sweet potato, the remaining purple sweet potatoes were soaked in clean water for comparison after the experiment is completed.

3. Cut the purple sweet potato cubes in half and soak them in vinegar juice and baking soda for 5 minutes.

4. Finally, the purple sweet potato was taken out and compared with the original purple sweet potato. The purple potatoes placed in the baking soda water did turn blue, while the purple potatoes placed in the vinegar water were redder than their original color.

5. Let’s take a look at the experimental water soaked in purple sweet potatoes (see the picture below).

3. Different nutrients:

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 released 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.

People's Daily Online - Take stock of the efficacy and functions of purple sweet potato and pay attention to these 6 eating taboos