Can you still eat prawns when they turn black, and why do shrimps turn black

It is recommended not to eat it again, such shrimp is generally not fresh, because the internal organs of the shrimp are broken after coming out of the water, and they oxidize and turn black quickly, and the longer they are placed, the more serious the blackening will be. It can lead to diarrhea and other conditions.

Hello friends who love life, I am your good friend Xiao K, an intelligent robot with no loss of human wisdom, Xiao K loves popular science, and his doubts become clear. What are you talking about today? If the shrimp head turns black, can't you eat it?

When the shrimp turns black and spoiled, they cannot be eaten. Eating spoiled food is likely to cause food poisoning and diarrhea, so do not eat spoiled food for the sake of your health. Daily purchases should be reasonable, and do not buy too much and cause food spoilage.

Don't eat it, you still have to eat fresh seafood, and you will have diarrhea if you eat stale seafood

If the shrimp head turns black, it is because the nutrients in the shrimp head are oxidized, so it turns black. To maintain a comprehensive and balanced nutrition, pay attention to supplementing more nutrients that can help improve sub-health conditions, and follow the principles: cautious use of drug intervention, reasonable choice of health food or health care equipment assistance, as well as relaxation, reasonable diet and appropriate exercise.

The consumption of shrimp does not affect it, but the taste is not as good as the original, and the shrimp will spoil if it is not handled well.

But when the whole body turns black, you can't eat!!

It depends on what kind of shrimp you have、、、 but also on how you cook 、、、

You can't eat it, you can't eat it when it's black or dead.

No. If the shrimp has black hair, it is not a fresh shrimp, and the whole shrimp is relatively black and not bright, which means that it has deteriorated.

Good shrimp have no odor. Fresh shrimp have a normal fishy smell, if there is a peculiar smell, it means that the shrimp have gone bad. In addition, it is important to pay attention to safety and hygiene when eating shrimp.

Shrimp may contain bacteria and parasites that are resistant to low temperatures, and even dipping them in vinegar and mustard cannot completely kill them, so it is recommended to eat them after they are cooked thoroughly. Shrimp that cannot be eaten should be refrigerated and heated before being eaten again.

If you can't eat it, then who dares to eat it.

Because shrimp, especially cephalothorax, contains PP0 (polyphenol oxidase), a series of biochemical reactions catalyzed by PP0, under aerobic conditions, PP0 will oxidize monophenol with colorless compounds on the surface of the shrimp body into colorless bisphenols, which in turn are converted into colored quinones, which are easily combined with amino acids in the shrimp body to form black-brown complexes.

Usually, the original color is not black, and there is a certain oxide that turns black after a period of oxidation. After the shrimp dies, it will slowly turn dark at the temperature of the top, and the usual method of treatment is to freeze the shrimp.

In daily life, it is very common for shrimp with black heads to turn black. For example, when you take out the frozen shrimp from the refrigerator, basically the shrimp heads have turned black. But I believe everyone knows that as long as the shrimp is stored in the freezer well, the shrimp can still be eaten with confidence, at most, the taste will be worse.

The reason why it turns black is because there is a substance called tyrosine in the shrimp head, which slowly reacts into melanin and pheomelanin. Although the longer the shrimp is stored, this black color is indeed more likely to appear. But this is just an enzymatic reaction, and it has nothing to do with whether the shrimp is fresh or not, and the produced melanin and pheomelanin are not harmful substances.

Shrimp that are really stale will have the phenomenon of shrimp head separation, shell meat separation and shrimp meat softness.

Selection method: 1. Look at the appearance: the head and tail of fresh shrimp are detailed, the head and tail are inseparable from the human body, and the shrimp body is relatively stiff and has a certain degree of bending. Stale shrimp are slack, the head and body, shell and flesh are slack, and the head and tail are easy to fall off or separate, and their original bending degree cannot be maintained.

After the frozen shrimp, the intestines and meat are not too inseparable, and we find that the shrimp intestines and shrimp are loose, which indicates that the shrimp is not dead and fresh.

2. Look at the color: the skin shell of fresh shrimp is glowing, the small river shrimp is emerald green, and the grass shrimp is blue-white female shrimp or egg pale yellow male shrimp. Stale shrimp have a dark shell and a bright red or grayish-purple color.

3. Look at the texture of the meat: fresh shrimp has a firm and tender meat texture, and it feels hard and malleable when touched by the hand. Stale shrimp have soft flesh and poor malleability.

4. Smell the taste: The taste of fresh shrimp is normal and odorless. If there is a distinguishing odor, it is moldy shrimp.

5. Touching the shell: The shell of the shrimp must be hard, the color is blue and bright, the eyes are protruding, the meat is firm, and the taste is too heavy. If the shell is soft, gray and cloudy, the eyes are sunken, and the shell meat is slightly separated, it means that the shrimp has just died.

Shrimp meat can still be eaten after blackening, this will not have any effect, don't worry, in general, shrimp meat is one of the ingredients that are extremely susceptible to mold. If spoilage is a problem, volatile acrylamine is produced, which makes the shrimp lose its malleability, which is a non-fresh characteristic of shrimp. When eating, if it is steamed or boiled, it is generally used for raw shrimp.

In addition, if it is a dry fried or spicy flavor with a heavy taste, it is easy to cover up the freshness, so you should pay more attention at this time.

Health Health Shrimp Fresh Chinese New Year's Eve Dinner, how to choose fresh prawns? Dishes are delicious when the ingredients are fresh.

Can't eat it anymore, it's already spoiled.

If the shrimp does not have some strange smell and is able to eat such a black substance, it may be caused by the water area in which it is located.

Prawns contain a very high protein content, and at the same time, prawns also contain trace elements needed by the human body, not only that, but the umami taste of prawns is also desirable for many people. Such a good prawn, ** is not low, some people will choose to take advantage of the prawns ** cheap to buy a large number of them, put them in the refrigerator to freeze, and some people can only go to the market to buy those cheaper shrimp, at this time, some people will find that some shrimp have turned black, can the prawns be blackened and eaten.

1. It is still a relatively normal phenomenon for the shrimp head to turn black, not because the shrimp is broken.

2. At the same time, if the meat of the shrimp body also begins to turn black, it must be thrown away, because it is likely that the meat quality of the shrimp has deteriorated, so don't eat it hard, it is likely to cause harm to the human body.

Shrimp hair black shrimp must not be fresh.

1. If stored at room temperature, the shrimp head will turn black over time, which can reflect the freshness of the shrimp to a certain extent. However, the melanism of shrimp is mainly due to the action of enzymes and has little to do with microorganisms.

2. Even under freezing or refrigeration conditions, tyrosinase is still active, so black transformation still occurs.

3. The shrimp head is also the internal organs of the shrimp, if the shrimp happens to eat a lot of dark algae before fishing, such as brown algae, the shrimp may also appear black.

4. In addition, the undigested feed of farmed shrimp may also appear black.

There are many reasons why the shrimp head turns black, some are normal, and some are caused by the quality of the shrimp itself, so you must be cautious when judging whether the shrimp is fresh according to the phenomenon of the shrimp head turning black. Of course, if you are still very worried, then choose to buy more expensive live shrimp, live shrimp taste better and more reassuring.

1. Can you eat refrigerated shrimp when it turns black?

If the refrigerated shrimp head turns black and the shrimp body is blue-gray or red, then it can be eaten, and if the shrimp body and shrimp head are black, then it cannot be eaten. When refrigerating shrimp, vacuum and then refrigerate to prevent the raw shrimp from turning black.

2. How to tell if shrimp is bad?

1. See if the shrimp head falls off, if the whole shrimp is relatively complete, the head and tail are closely connected to the body, indicating that the shrimp is relatively fresh. If the head of the shrimp falls off, the head and body, the shell and the meat are loosely connected, and the head and tail are easy to fall off or separate, which is not fresh.

2. Shrimp that are cooked and then frozen. Look at the color of the shrimp head. The shrimp head is very shiny, not black, that is a good shrimp. And if it's blackened, it's not fresh. Red shrimp is cooked, the head is black, it is frozen after death, or it has deteriorated more badly, this kind of is not wanted.

3. Refrigerated shrimp, frozen raw green shrimp. Look at the shrimp shell color. It is better to compare white, blue-white and do not redden, the redness is not fresh.

In short, when buying shrimp, you must have certain skills to distinguish between good and bad, and choose shrimp with a complete body, dense carapace, clear and distinct shell, tight muscles, elastic body, and dry and clean body surface. As for the loose meat, reddish color, and fishy smell, it is not fresh enough shrimp and should not be eaten. Generally speaking, the head is closely connected to the body, and it is relatively fresh.

Therefore, when buying green shrimp, you should pay attention to discernment, so as not to buy stale shrimp.

You can't eat it. Shrimp contains PP0 (polyphenol oxidase), which oxidizes monophenol with colorless compounds on the surface of the shrimp body into colorless bisphenols under the condition of oxygen, and bisphenols are converted into colored quinones, which are easily combined with amino acids in the shrimp body to form black-brown complexes. Shrimp turning black is not recommended to continue eating.

1. Shrimp is rich in nutrition, and its meat is soft and easy to digest, which is an excellent food for people who are weak and need to recuperate after illness.

2. Shrimp is rich in magnesium, magnesium has an important role in regulating heart activity, can protect the cardiovascular system, it can reduce blood cholesterol content, prevent arteriosclerosis, and at the same time can dilate coronary arteries, which is conducive to preventing hypertension and myocardial infarction.

3. Shrimp has a strong lactation effect, and is rich in phosphorus and calcium, which is especially beneficial to children and pregnant women.

4. Scientists from Osaka University in Japan recently discovered that astaxanthin in shrimp helps eliminate "jet lag" caused by jet lag.

5. Shrimp contains 20% protein, is one of the foods with high protein content, several times or even more than ten times that of fish, eggs and milk, shrimp and fish meat, the essential amino acid valine is not high, but it is a nutritionally balanced protein**, in addition, shrimp contains glycine, the higher the content of this amino acid, the higher the sweetness of shrimp.

If the prawns are black, it's better not to eat them, because they have spoiled, so don't eat them to avoid eating them and hurting your stomach.