What should I do if the yam is itchy? What kind of yam is the best?

Yam is a good food with high nutritional value, which can strengthen the spleen and moisten the lungs, but many people's fingers itch when cutting yam, so what is the itch of cutting yam? What kind of yam is the best?

How is one's fingers itch when cutting yam?

Yam contains saponin. After peeling, there will be a mucus, in which protein and dioscin will irritate the skin and cause allergies.

Because the saponin contained in yam mucus may cause allergies, contact dermatitis may be caused after human skin contact. The most common symptom is itchy hands. In severe cases, symptoms such as redness, swelling and tingling will appear. Allergic symptoms often appear at slightly different times. Some people react quickly and itch when they cut their hands. It takes some time for some people to react. This is also the reason why many people feel itchy when they peel yam themselves. At present, there are indeed many cases of contact dermatitis caused by yam in clinic.

The good news is that saponins that cause allergies are more afraid of heat. Therefore, if you are afraid of allergies, after peeling or cutting the yam, you can wash your hands first and then bake it on the fire to stop itching; Of course, you can also take precautions: before handling yam, you may wish to bring rubber gloves, or put a fresh-keeping bag on your hand, and then peel or cut it, so as to prevent contact with substances that may cause allergies, and you don't have to worry about itchy fingers.

What kind of yam is the best?

The best variety of yam is iron stick yam.

The best producing area of yam is Jiaozuo, Henan Province (formerly Huaiqing Prefecture), and the local yam is called "Huai Yam".

Therefore, the best yam is naturally iron yam! Among them, the quality of yam is higher.

Method for selecting Chinese yam

1, from the appearance, yam with smooth and crisp skin is suitable for frying; If it is a stew or a dessert dish, it is recommended to choose noodle yam, which will be very sweet and full. Noodles and yam are characterized by many pockmarks, many whiskers and smoothness.

2. Look at the appearance. Slightly flat, the head is a little bent, and the color is brown; Or the stem is straight and the texture is solid; Or the shape of a small hand, are all good yam. If there are bumps, the taste may be slightly harder.

3. Then hold it in your hand. Hold yam for a period of time, the length of time can depend on the weather at that time, the warmth can be shorter, on the contrary, the holding time can be longer. After holding, the fresh yam skin has a warm feeling; Stale yam will "sweat" and tiny water drops will ooze from the epidermis, which is frozen yam. Once yam is frozen, the content of polysaccharide and free amino acid in mucus will be destroyed, the nutritional value will be reduced and the taste will be poor.

4, you can open a little skin when buying, or look at the cut surface of yam, the meat is white, and the sticky juice is fresh yam; After the frozen yam is cut, the flesh is as red as rust and the heart is as hard as water.

5, according to the weight, the same size of yam, the heavier the better.

6, look at the hair, the same variety of yam, the more hair, the better. The more hairs yam has, the better its taste, and the more polysaccharides yam has, the better its nutrition.

7. finally look at the cross section. The meat quality of the cross section of yam should be white, which means it is fresh. If it is yellow like rust, don't buy it.

Note: Never buy yam with abnormal spots on its surface, because it may have been infected with the disease. It should also be noted that the cut surface of yam should contain mucus, so as not to damage the skin. Yam is afraid of freezing and heat. To buy yam in winter, you can hold it in your hand for about 10 minutes. Yam is frozen if it sweats. Looking at it, the cross-sectional mucus of frozen yam will turn into water, with hard heart, red meat color and poor quality.

How to tell the true and false yam?

Look at the "heart line" first. There is no heart line in the middle of yam slices, but there is a heart line in the middle of potato chips. Although the heart line is very small, you can see it by careful observation. Some wood chips are very thin and tend to lose their cores after drying. However, when the core falls off, it will leave a small hole. If there is a small hole in the middle, it must be potato chips.

Second, look at the edge. The skin of yam is very thin and will be cleaned before slicing. Cassava skin is much thicker than yam skin. Some cassava as big as a thumb is too small to peel, so counterfeiters often don't take the time to peel it. Therefore, after cutting into dry slices, thick skin will remain on the edge. A thick-skinned person must be a rockery.

Third, touch to distinguish between true and false. Dried yam slices contain a lot of starch. Touch it with your hands, it feels more delicate, and more starch will stick to your hands. Although cassava contains a lot of starch, its crude fiber is more than yam, and it feels rougher than yam by hand, and there is less starch left in the hand.

Fourth, the identification method after cooking. Yam is generally easy to cook, but cassava is difficult to cook. Boiled yam has a rotten and powdery taste, while cassava has a hard taste.