Crab dead can eat?
Dead crabs can not be eaten, otherwise it will cause poisoning, and even death. Crabs are often caught trying to break free causing an increase in lactic acid in the body, which can lead to rapid multiplication of bacteria in the crab's body after death and spread to the crab meat. The bacteria will break down the amino acids in the crab's body and produce a harmful substance called histamine, which can cause allergic food poisoning; another substance that may be produced is histamine-like, which can cause vomiting, abdominal pain and diarrhea, so be careful when selecting crabs.
Crab usually like to eat some rotten food, such as animal carcasses. Pathogenic bacteria, parasites and some toxic substances often exist in its gills and gastrointestinal tract. In spite of this, people eating live crabs (with gills and internal organs removed) will not cause poisoning. This is because there are generally no pathogenic bacteria and toxic substances in the muscle of the living body, but when the crab leaves the water, with the prolongation of time, its vitality gradually weakened, the bacteria outside the body will begin to reproduce a lot, until the depth of the muscle, and the composition of its tissues began to disintegrate, and once the crab is dead, the bacterial reproduction is faster, which is when the body of the crab with a large number of bacteria and toxins.
This toxin is histamine. Because the crab is a high-protein food, there is an amino acid called histidine, histidine decarboxylase decarboxylation under the action of the formation of histamine, when the histamine accumulation to a certain extent, there is a risk of poisoning after eating.
It is generally believed that adults ingesting more than 100 milligrams of histamine can cause allergic phenomena, such as facial flushing, skin allergies, conjunctival congestion and other symptoms, and headache, dizziness, pulse frequency, palpitations, thirst, burning throat and lip swelling; there are mouth, tongue and limb numbness, general weakness and irritability; more serious may also be asthma, respiratory distress, dizziness, fainting, etc.. The more serious may also have asthma, dyspnea, dizziness, fainting, etc.
Maybe some people will ask, after the crab is cooked, the crab is not still dead? The only thing you can do is to eat the dead crabs. Why can't we eat crabs that are naturally dead?
There is a difference between the natural death of the crab, the body of the toxins will multiply, and these toxins will decompose the crab meat, and for the do-it-yourself in the do-it-yourself crab, that has been drained of the body of the toxins, and also after the high temperature, these are effective in preventing the spread of bacteria, better to play a role in the killing of bacteria. And is the water boiled, and then boiled for 20 minutes, so that the crab meat inside the germs to kill, the crab flavor is very fresh.
But if the crab is improperly preserved and causes death, it's better to send it directly to the garbage can, for your own health and for the health of your family.
How to choose fresh crabs?
Crabs will lose their vitality as they are removed from water for a longer period of time, their taste will deteriorate, and they may even produce toxic substances. Therefore, it is very important to ensure that the crabs are fresh and alive.
To determine whether the crab is alive, you can touch the crab's eyes, the reaction is more intense, indicating that it is alive; you can also turn the crab belly up, to see if it can be turned over to determine whether it is healthy enough to live; you can also put your finger between the crab claws, such as the crab claws strong, that the crab is strong enough to see whether the crab is spitting bubbles, leaving the water of the crab spit out the bubbles, the crab is alive.
How to choose hairy crabs? Fine selection of crab to "five look".
One look at the crab shell. Where the back of the shell is black-green, with a bright light, are meat thick and strong; the back of the shell is yellow, most of the more thin and weak.
Two look navel. Navel convex out, a cream fat fat full; concave in, most of the fat body is not enough.
Three look at the chelipeds. Where the chelipeds on the fluffy tufts, are chelipeds old and healthy; and chelipeds without fluffy, the body is soft.
Four look at the vigor. The crab will be turned over, abdomen to the sky, can quickly turn back with the stinger, strong vitality, can be preserved; can not be turned back, poor vitality, can not be stored for a long time.
Five look at male and female. In the eighth and ninth months of the lunar calendar, you should pick female crabs and male crabs after the ninth month, because male and female crabs mature in the gonads at these two times, and they have the best flavor and nutrition. By carefully studying and referring to these "five looks", you will be able to pick out quality crabs from a large number of crabs.
Can you eat overnight crabs?
There has always been a saying that "river crabs can only be eaten alive, and even if cooked, they cannot be eaten overnight, or they will be easily poisoned". As a matter of fact, some people do buy home river crabs all at once steamed and boiled through, and then put into the refrigerator to save, think so there will be no problem. This is the first time I've seen this.
Cooked river crabs can be eaten overnight, but not into the refrigerator is the same as into the safe, stored for too long cooked crab is still easy to cause poisoning killer. Because in the overnight leftover crab there is a substance called histidine, it will be in the role of some microorganisms decompose into histamine, back to the pot heating although you can kill pathogenic microorganisms, but can not destroy the toxin.
When all is said and done, what should we do if we can't finish the cooked crab? If you don't eat it all that night, you can wrap it in plastic wrap and put it in the refrigerator when it cools down, or you can freeze it if you have the means. But do not store cooked crab in the refrigerator later than noon of the next day, and then eat it again, remember to steam again, eat the best put some ginger, favorable sterilization. This way to eat crab, in order to ensure the enjoyment of delicious at the same time, but also take into account the safety.
Healthy eating crab a few precautions
Crab and other foods are different, its more histidine-containing food, overnight leftover crab histidine in the role of certain vitamins, will be decomposed into histidine ammonia, back to the pot heating can kill pathogenic microorganisms, but can not destroy the toxin, which can lead to histidine toxicity, so the crab is best to eat now steamed, generally not more than 4 hours.
The best thing to do is to eat only one. Crab is delicious, but eat more or their own physical reasons for the limitations, are easy to let you full of mouth, loss of body. Because crab is rich in protein and high in cholesterol, it is easy to get sick if you eat too much. Even for healthy people, crabs eat too much, can cause stomach pain, bloating, vomiting and diarrhea and other indigestion symptoms. For people who suffer from hepatitis, cardiovascular disease, cholecystitis, colds and other diseases, eating crabs may aggravate the condition, if you eat raw pickled crabs will cause a variety of diseases.
Special reminder that there is a side of beer while enjoying the food friends, eat crabs, with their food also have to pay attention to, eat crabs, do not drink beer, because these two foods contain high purine, eat more will cause gout. People who want to drive away the coldness of the crab, you can drink some white wine or Shaoxing yellow wine when eating, or add ginger, perilla and other ingredients when cooking.
Meanwhile, when eating crabs, you must get rid of the gills, heart, stomach and intestines of the crab, because these four things contain bacteria, viruses and sludge. In addition, crabs must not be eaten with persimmons, pears, peanut kernels, loaches, melons.