This is because purple sweet potato is also an important nutrient element of sweet potato. In addition, purple sweet potato also contains a nutrient element that sweet potato does not have, namely anthocyanin. The unique color of purple sweet potato comes from anthocyanins. At the same time, the content of zinc and selenium in purple potato is 3-8 times higher than that in sweet potato.

Purple sweet potato is rich in dietary fiber, starch, vitamins and trace elements (selenium, iron, calcium, potassium, etc. ), anthocyanin, glycoprotein, carotene, dehydroepiandrosterone and other functional factors.

Purple sweet potato is a plant of Panicum genus in convolvulaceae. Potato-shaped spindle-shaped, pulp from purple to deep purple; Seeds round, winged; The flowering period is early summer, and June-August is the potato-bearing period.

Method for selecting purple sweet potato

1, look at the shape: when choosing, choose a slightly longer shape, a rotating cone. This shape of purple potato tastes pure.

2, look at the skin: the skin is smooth, there is no abnormality, then the purple potato is fresh, there is no deterioration, if the purple potato skin is rough, if there are black spots, it means that the purple potato has deteriorated.

3, smell: there is no strange or musty smell, you can choose with confidence, if the purple potato has musty or strange smell, don't choose.

4. Softness: Purple potato is rich in starch and is a hard tuber. If the purple potato is pinched in your hand, the skin will shrink and it is likely to go moldy and deteriorate. Purchase is not recommended.

Reference to the above content: Baidu Encyclopedia-Purple Potato