The yam has changed color, can I still eat it? How do yams not change color?

The darkening of yams is due to the browning of enzymes, which causes them to darken in color. Yams that have changed color due to mildew cannot be eaten, but they can be eaten if they have changed color due to oxidation.

The main conditions for the occurrence of cut browning:

1. Polyphenol substances, polyphenol oxidase and oxygen. After the yam is peeled, it is exposed to the air, and the polyphenols in it react with oxygen to produce o-quinones, which are further oxidized and polymerized to form brown pigments and melanin.

2. Fresh yam is easy to oxidize with oxygen in the air, and it is easy to produce browning when it comes into contact with metals such as iron knives, which looks like white yam turning black.

It's okay if it's oxidized, but it's not okay if it's deteriorating.

There is a trick to how to make yam not blackened, and it will not change color for a day.

1. Choose stainless steel or ceramic for the paring knife.

Yam is a very easy to change color after peeling, when peeling, we should choose stainless steel or ceramic knives, these two materials of knives are not easy to make it oxidative and discolored. If peeled with an iron knife, the yam is very susceptible to discoloration.

2. Add white vinegar and soak.

Before cutting the yam, prepare a basin of water, add a little white vinegar to the water and stir well. In the process of cutting yams, the cut yams should be soaked in water immediately, which can prevent the yam from changing color.

3. Other methods.

In order to prevent the yam from changing color, we can also blanch it, and the blanched yam is not easy to change color; You can also brush the cut yam with a layer of oil, which can prevent it from changing color; You can also freeze the chopped yam in the refrigerator to prevent discoloration.

It can be eaten without rotting and deterioration.

There are two types of yam discoloration, one is that the skin becomes brown after peeling, and the flesh comes into contact with oxygen after peeling, and the normal oxidation reaction occurs, so that it can be eaten; One is rotten deterioration, because there are toxic ingredients in the rotten brown yam, and if it is harmful to your health if you eat it, then you can't eat it.

First, the preservation method of yam:

1. After peeling and cutting the yam into pieces, it should be packed in a plastic bag according to the amount of each consumption, and immediately put it into the upper layer of the refrigerator for rapid freezing after packaging.

2. The yam does not need to be thawed when eating, and the water can be boiled to put it in the pot, which is convenient and can ensure the quality of the yam.

Second, the method of yam not blackening:

1. Do not use metal props (stainless steel can be used) to cut yams, but use wooden or material knives.

3. You can also fry the yam with water first.

The above content refers to People's Daily Online-What to do if yam turns black How to save yam without discoloration.

Every time I peel the yam, the yam turns rust-colored, and when it comes out of the pot, it turns black again, and there is a rusty smell...Why do peeled yams change color easily? It turned out that the yam was oxidized by contact with oxygen in the air

You should also pay attention to the knives used when cutting yams, and you must not use iron, but stainless steel.

Another way is to soak it in water directly after cutting, which can also be used to cut eggplants, loofahs and other things.

The boiled yam is very ripe and glutinous, the taste is very good, it is also rich in nutrition, and it is also a medicinal material in traditional Chinese medicine, so it can be said to be a perfect match when used to make soup. I believe that friends who have handled yam have experienced yam discoloration, and this discoloration is mostly a normal phenomenon, because yam contains amylase. So is there any way to make yam less discolored?

1.The discoloration of the yam is caused by the phenolic oxidase in it turning purple when exposed to oxygen, so the yam can be cut into thin slices and scalded in a boiling pot to deactivate the phenolic oxidase.

2.Once sliced, it is washed and soaked in water to isolate oxygen.

3.Once the yam is thinly sliced, squeeze some lemon juice and stir to combine. Because the citric acid in lemon juice can inhibit the activity of phenol oxidase, the vitamin C in it can inactivate phenol oxidase and also has an antioxidant effect.

So that the yam does not turn black. It can also be soaked in salt water or vinegar water.

Yam contains phenolic substances, and after being cut, it will combine with oxygen in the air to produce colored quinones, resulting in a change in color, generally from white to brown, this phenomenon is called enzymatic browning, which is a normal condition. Usually after peeling, soak it in salt water, so it is not easy to change color.

1.Yam is a high-starch food that contains a lot of energy. Therefore, yam is not suitable for excessive consumption to avoid obesity and hyperglycemia.

2.Yam contains some exogenous proteins that are allergenic. Therefore, people with allergies should not consume yam to avoid causing itching, swelling of the throat, difficulty breathing and other allergies.

If the yam changes color after being cut for a while, it can be continued to be eaten, which is a normal reaction of yam oxidation. If the yam changes color when it is opened, it cannot be continued to be eaten, because this situation is usually caused by rot and deterioration, and eating it will cause physical discomfort.

Can you eat yam that changes color when you cut it?

If we cut the yam for a period of time before it changes color, then the yam can continue to be eaten, because after the yam is cut, it will react with the oxygen in the air and gradually change color, which is a very normal phenomenon.

But if the yam changes color when everything is opened, then the yam cannot continue to be eaten, because the internal discoloration of the yam is usually caused by decay and deterioration, and if we eat this yam, it will cause physical discomfort.

Yam is a kind of yam is mainly distributed in China's Henan Daji, Jiangsu, Zhejiang, Fujian, Hubei and other places, it is rich in nutrition, but also has a trace of medicinal value, we usually use it at home to stew soup to drink.