Why do peeled sweet potatoes turn black? Is there a way not to blacken?

Sweet potato is also a kind of food that everyone likes to eat in daily life, sweet potato is sweet potato, sweet potato its skin is red, and then after cooking, the meat inside is white or yellowish, in daily life we can find that sweet potato can be eaten directly raw, it tastes sweet and silky, and then it can also be cooked and eaten, and it is soft and glutinous when cooked, so it is also liked by many people. If you peel a sweet potato, or if you cut it and put it there, it will turn black, just like an apple will turn yellow when you cut it and put it there, and the reason why it turns black is due to oxidation.

In addition to sweet potatoes, apples and potatoes also undergo oxidation reactions and turn black. <>

Raw sweet potatoes are cut and then cut into their cells, which are known to contain phenolic substances, and the air contains oxygen, which is a substance that we humans need. Similarly, when a sweet potato is cut, it combines with oxygen to produce a phenolic substance that can then discolor the cells of plants. For example, the cells of sweet potatoes turn black or brown, so in this case, the sweet potatoes will change color when they are cut open, because the sweet potato is not protected by its skin before it is cut, so that its flesh is not in direct contact with the air, and there will be no oxidation, and once it is cut or peeled, thenThis membrane of the peel is equivalent to being destroyed, and an oxidation reaction will occur, just like an apple will change color when peeled for a period of time, which is the same principle.

Adding some antioxidant effects can prevent blackening, and to prevent the peeled sweet potato from turning black, it is to prevent it from oxidizing. First prepare some water, and then add lemon juice to this water.

Lemon juice is acidic and has an antioxidant effect. One of the ways to do this is to put the peeled sweet potatoes in water so that they don't turn black. Another way is that you can use some salt to rub the skin of the sweet potato before peeling it, and then wash the salt off.

In addition, the peeled sweet potato will not change color if it is dipped in salt, but it may have a salty taste because it comes into contact with salt after peeling.

It is because the reason for the blackening is that an oxidation reaction has occurred. You can isolate oxygen, you can wrap it tightly with plastic wrap, and the air will not turn black.

The blackening of sweet potatoes after cutting is due to oxidation. After scraping or cutting raw sweet potatoes, the phenolic substances in plant cells are oxidized with the air under the action of phenols, producing a large number of quinones. The new quinones can cause plant cells to quickly turn brown or even black, a change called enzymatic browning (black) of food.

So raw sweet potatoes will change color after scraping or cutting them open for a while. Put the unpeeled sweet potatoes in warm salted water and soak them for five minutes before peeling them will not change color, if you peel the skin first, it doesn't matter, dip the peeled sweet potatoes in the salted water, and they will not turn yellow and discolored for a long time.

This is because there is a lot of phenols inside the sweet potato, and there is also an oxidation reaction, and the peeled sweet potato can be placed in clean water.

Because it oxidizes when exposed to air, it can be soaked in water without turning black.

If sweet potatoes are stored for too long or in too humid places, sweet potatoes may be infected with black spot disease due to some molds. This sweet potato with dark spots contains a variety of toxins that can cause poisoning when eaten by humans. It is not recommended to eat.

Sweet potatoes are black when cooked and can be eaten, but they turn black because the starch in sweet potatoes turns black when exposed to iron, which is a normal phenomenon. Sweet potato, scientific name, is an annual herbaceous plant with round, oval or spindle-shaped roots in the underground, and the shape, skin color and flesh color of the roots vary depending on the variety or soil. The shape and color of the leaves often vary from variety to variety, and sometimes within the same plant.

1. If it is a natural phenomenon that produces blackening after oxidation, it can be edible. Because sweet potatoes contain starch, the starch will change color when it reacts with oxygen in the air, and sweet potatoes can be eaten in this case.

2. If it is blackened due to decay and other conditions, it is not edible. If the blackened area of the sweet potato smells unpleasant, it may be spoiled and inedible.

After the sweet potato is cooked, if it is placed in the air for a long time and is in contact with oxygen, it will sometimes turn black, and it can be eaten in this case. But if the dark area has a bad smell or is hard, then you can't eat it.

Can sweet potatoes be eaten when they turn black when cooked? Of course, it can't be eaten, it's cooked and blackened, which proves that it's spoiled inside.

Hello, the sweet potato turns black after cooking, so it is generally not edible, because it has turned black, it is already abnormal.

Can I eat sweet potato assistant after it turns black, sweet potato can't be eaten if it turns black after cooking, which means that the ground is slippery and has been broken, so it can't be blackened ten times.

Can sweet potatoes still be eaten when they are cooked and turned black? When it is cooked, it turns black, and it can no longer be eaten, probably because it is not visible when it is raw, and it can only be seen after it is cooked.

Definitely not, in fact, I think it is better to control it as much as possible, in fact, sometimes I think this situation may be the reaction of some substances in it.

The sweet potato turns black after cooking, of course, you can't eat it anymore, because it turns black, it's likely to be spoiled, so you can't eat it anymore.

The sweet potato turns black and can't be eaten after cooking, because well, he has a gas army, right? Therefore, it is not a sweet potato that can not be eaten after cooking.

The sweet potato turns black after cooking, which should be the reason why the sweet potato has become moldy and spoiled, and such sweet potatoes can no longer be eaten.

Sweet potatoes turn black after cooking, which is impossible, it should be the reason for storing them for too long, or do not use them again.

After cooking, it has already deteriorated when it turns black, and it is inedible, and there is aflatoxin, which will be poisoned if you eat it.

Sweet potatoes have changed after planting, so they can be eaten without any problems, and these are caused by too high firing temperatures.

After the melon is cooked, it turns black and can be eaten, just remove the blackened part.

It is normal for sweet potatoes to turn black if cooked, and if you leave it for a long time, it will oxidize to produce such a color.

I think it's enough to remove the black areas and eat only the white ones.

1. Oxidation: Sweet potatoes contain a lot of iron and starch, which are easy to react with oxygen in the air after peeling, and turn black.

2. Deterioration: Sweet potatoes are stored for too long, the content of sweet potato ketone and sweet potato ketone alcohol increases, the internal structure changes, and the situation of blackening occurs, at this time, the sweet potato becomes hard and bitter, which is easy to affect the human liver, and it is generally not recommended to eat.

Nutritional value: 1. Sweet potatoes contain dietary fiber, carotene, vitamin A, vitamin B, vitamin C, vitamin E, potassium, iron, copper, selenium, calcium, and more than 10 kinds of trace elements. It has a high nutritional value and is called the most nutritionally balanced "health" food by nutritionists.

2. Sweet potatoes are rich in potassium, carotene, folic acid, vitamin C and vitamin B6, all of which help prevent cardiovascular disease. Sweet potatoes contain collagen and mucopolysaccharides, which can reduce the content of total cholesterol in the blood and prevent the occurrence of arteriosclerosis and coronary heart disease.

3. The fiber contained in sweet potatoes is equivalent to 10 times that of rice noodles, its texture is delicate, does not hurt the stomach, can speed up the peristalsis of the digestive tract, helps to defecate, clean up the digestive tract, shorten the retention time of toxic substances in food in the intestines, reduce the body's own poisoning caused by constipation, reduce the concentration of intestinal carcinogens, and prevent hemorrhoids and colorectal cancer. At the same time, fiber can absorb a part of glucose, so that the amount of sugar in the blood is reduced, which helps to prevent diabetes.

4. Sweet potato is rich in mucus protein, which is a mixture of polysaccharides and proteins, which has a special protective effect on the human body, and can maintain the lubrication of the digestive tract, respiratory tract, joint cavity, membrane cavity and the elasticity of blood vessels. It also contains glycoproteins, which have good anti-mutation, hypolipidemic and immunity-enhancing effects.

5. Eating sweet potatoes often helps to maintain the normal level of folic acid in the body, and low folic acid content in the body will increase the risk of cancer.

Why do peeled sweet potatoes turn black? Is there a way not to blacken?

Dear, Hello, peeled sweet potatoes turn black: the blackening is due to oxidation. If you want it to not be black after peeling, it is to isolate the air, etc., sweet potatoes contain a lot of iron and starch, and after peeling, they will react with the oxygen in the anger, and rub them on the skin with salt a few times before peeling them, and then wash them off, so that the sweet potatoes can not only not be oxidized, but also stored for a long time.

This is a fungal disease of sweet potato black nevus, which is a fungal disease, and high temperature and humidity are conducive to the onset of the disease. It is mainly harmful to the surface layer of potato pieces, at first there are only some small light brown spots on the epidermis, and slowly expand into large black-brown lesions, and in severe cases, the affected parts will harden and produce fine cracks. Can't eat.