1, crab just dead can eat
(1) just dead crab can eat
just dead crab can not eat. Not only just dead crabs, dying crabs, drunken crabs, or some unknown crabs can not be eaten, these crabs contain substances harmful to the body, after eating easy to food poisoning, or other diseases.
(2)Why can't you eat
Taste deterioration
Crab body contains histidine, histidine in the decarboxylase enzyme under the action of the production of histamine and histamine-like substances, after the death of the crab, the intestinal glands will be quickly disintegrated, which histidine and digestive enzymes will be the decomposition of the crab meat, so the dead crab meat will deteriorate, the taste of the big discount.
Allergic symptoms
Histidine contained in crab meat will be converted into histamine after the crab dies. Histamine is an allergenic substance, which will lead to vasodilatation, congestion and edema of the skin and mucous membranes, urticaria, nasal congestion, runny nose, bronchial asthma, and other allergic symptoms after the human body ingests it, and in severe cases of respiratory and circulatory failure, which may lead to life-threatening injuries.
Causing food poisoning
Crab is an omnivore, like to eat decaying plant and animal carcasses, these plants and animals contain a large number of bacterial viruses, crab alive, their own metabolism can fight microbes and inhibit the reproduction of bacteria, and after the death of the crab, microorganisms will utilize its nutrients to reproduce rapidly, resulting in the corruption of crabs spoiled, producing too many toxins, people eat it! It is easy to have diarrhea and abdominal pain, vomiting, fever and other symptoms of poisoning.
(3)Why can't you eat drunken crab
Many people think that after soaking in white wine, the crab can be sterilized and disinfected, so there is no problem to eat, in fact, the crab lives in the stream, or the river bank, the body may be with parasitic worms called cysticerci, the alcohol in white wine can't kill the parasites. The alcohol in white wine does not kill this parasite, so when you eat drunken crabs, if you don't clean them up thoroughly, this parasite can easily enter the body and pass through the intestines to the lungs, and in serious cases, it can even reach the liver, the brain and other organs, resulting in organ cysts.
(4) the way unknown crabs can not eat
Some vendors use crab wash powder to soak ordinary river crabs, used to pass off as high-priced Yangcheng Lake hairy crabs, this crab wash powder with the same wash shrimp powder, contains a large number of oxalic acid components, oxalic acid has a strong corrosive, the human body ingested this material, easy to cause urinary stones.
(5) fresh live crabs how to save good
1. buy back the live crabs if not immediately eat, pay attention to save, first will not be very flexible reaction of the crab picked out to eat, vitality of the crab properly preserved, in order to avoid premature death and can not be eaten.
2. You can tie the legs and feet of the live crabs to reduce the physical exertion of the crabs, put them into containers, add water to the surface of the crabs, and store them in a cool and ventilated place or the freezer of the refrigerator, so as to maximize the freshness of the crabs.
3. When preserving crabs, pay attention to the fact that if they are kept in the refrigerator, the temperature of the refrigerator should be kept at about 5 to 10 degrees Celsius; if they are kept in plastic pots or buckets, pay attention to the addition of water, but the crabs should not be buried all the way down, so as not to lead to asphyxiation of the crabs due to lack of oxygen.
(6) several types of people should not eat crab
Coronary heart disease, high blood fat people: crab contains high cholesterol, the human body can not be more than 300 milligrams of cholesterol intake a day, and 100 grams of crab roe contains cholesterol as high as 460 milligrams, so it is not suitable for coronary heart disease and high blood fat people to eat.
Gallstones, pancreatitis, hepatitis active patients: the protein contained in the crab is more, easy to promote the secretion of pancreatic fluid after eating, this group of people eating crab is likely to lead to aggravation of the disease.
Gout patients: crab is a high-purine food, easy to aggravate the condition of gout, especially when the crab and beer with food.
Infants and young children: crab yolk and crab paste belong to the reproductive system and reproductive cells, containing a large number of sex hormones, eating too much is likely to cause precocious puberty in children.
2, crab how to save
(1) refrigerator preservation crab
Crab is best kept in a cool environment, the refrigerator is the best preservation of the environment, if the crab's vitality is still strong enough, you can tie up the crab's feet, which reduces the crab's physical exertion, in order to avoid the body of the lactic acid in the process of the crab's struggles to increase the proliferation of accelerated bacteria in the body . The temperature of the refrigerator freezer is best kept at 5 to 10 degrees Celsius, and it is enough to cover the crabs with a wet towel.
(2) water basin / bucket preservation of crabs
Prepare a plastic basin or plastic bucket, the vitality of the crabs into it, pay attention to not put the crabs stacked into, add water to the half of the crab's body, pay attention to moisturizing, but can not be covered with water all, because the water is too deep, the crabs will be suffocated by a lack of oxygen to die, the water basin or bucket do not need to be added to the lid, this way to save the If the temperature is not very high, the crabs can be preserved for more than half a month.
(3)How to save boiled crabs
Boiled crabs can be preserved for a short time, provided that the temperature is relatively low, you can use plastic wrap to cover it and put it in a cool and ventilated place, which can generally keep it fresh for 6 - 8 hours; if the weather is relatively hot, and you want to save it for a short period of time, then it is best to put the crabs into a refrigerator freezer so that the crabs at noon can be preserved until the evening, but not overnight. If cooked crabs want to be kept overnight, it is better to put them in the freezer.
(4)How to keep live crabs without dying
1, put the crabs bundled up in the freezer, preferably in the layer of fruit, put the wet towel on top of the crabs, don't wring it out too much, don't fold the towel over and lay it on top of the crabs. This will keep for a while.
2, keep the crabs in water . If the crabs are too thin or you want to store them for a while, you can feed the crabs some sesame seeds or broken eggs and add some yellow wine to fatten them up.
3, keep moist, live a week or two is not a big problem, do not use the water soaked on the line. Professional crab breeding places are usually placed in cement pools, spray water every day, sometimes put a month or two.
(5)How to preserve river and sea crabs
River crabs can't get wet, put them in a container and cover them with a wet towel, or put them in a pot with a string, open the lid diagonally a little bit to breathe, and put them in the refrigerator.
Sea crabs can be kept in the freezer for several months if they are tied up and put on ice.
When selecting crabs, try to choose green-shelled crabs; those with green shells and yellow shells are less fresh and have a shorter shelf life.
(6) cooked crab in time to eat
Preserved cooked crab to eat, try to return to the pot to steam through before eating, but to be in the refrigerator freezer (not refrigerated) to be covered, because cooked crab and fog, dew and other toxic contact, the next day to eat must be cooked again in boiling water, to open the pot and then heated for half an hour, to prevent microorganisms within the crab is not completely killed. Crab should be eaten with grated ginger and vinegar to prevent stomach damage. But if it becomes tasteless, it is best to throw it away so as not to harm your health.