1. Nutritional value: Purple potatoes are rich in cellulose, protein, vitamins, carotene and other nutrients similar to sweet potatoes, but purple potatoes also contain a special ingredient - anthocyanins, and their selenium and zinc content is also 3-8 times higher than that of sweet potatoes. These micronutrients make purple potatoes slightly higher in nutritional value than sweet potatoes.
2. Edible taste: sweet potatoes have a higher starch content, so the taste is sweet, soft and glutinous. Purple potatoes, on the other hand, have a higher crude fiber content and less moisture content, so they may feel drier and have a noodle feel when eaten.
3. Main uses: Sweet potatoes are often used for steaming, roasting, and boiling, and are also common high-quality raw materials for starch processing. Purple potatoes, on the other hand, are more used for coloring desserts and making pasta, and the purple potato starch processed from them has a higher market value.
4. Color: The color of purple potatoes is generally purple or dark purple, while the colors of sweet potatoes include yellow, orange and light yellow.
5. Efficacy: The anthocyanins in purple potatoes have antioxidant, anti-aging, anti-cancer and other effects, while the vitamin A and carotene in sweet potatoes have a good protective effect on the eyes and can improve vision. In addition, both purple and sweet potatoes are rich in dietary fiber, which helps to promote digestion and prevent constipation.