The white frost on the dried sweet potatoes is called "sweet potato frost", which is the sweet potato sugar that overflows from the dried sweet potatoes.

In addition to containing a lot of water, fresh dried sweet potatoes also contain sugar. The water gradually evaporates, and the glucose and fructose contained in the pulp penetrate into the skin. Although the sweetness of glucose is not as sweet as fructose, it can easily capture the moisture in the air. When it penetrates into the skin of the sweet potato, it forms a layer of The white powder just covers the fructose, making the entire dried sweet potato dry. Therefore, the dried surface of sweet potatoes is usually covered with a thin and even layer of white frost.

The nutritional value of dried sweet potatoes

Dried sweet potatoes have high glucose and vitamin A and B contents. According to research, the nutrition of dried sweet potatoes is relatively balanced, and the protein efficiency is similar to that of milk. The amino acid composition of the protein is higher except that it contains less sulfur acid and tryptophan.

Especially rich in cellulose and selenium, an essential element that has specific significance for human health, it has attracted much attention from nutrition and health experts. It can be used as a snack, or can be added with seasonings and processed into a banquet accompaniment.