How to Identify Fresh Frozen Shrimp
1. Look at the color
Frozen shrimp is divided into two kinds, one is red shrimp. Red shrimp is cooked and then frozen. For this, look at the color of shrimp head. Shrimp head is very bright, not black, it is good shrimp. And if it's dark, it's not fresh. Red shrimp is cooked with black head and frozen after death. This kind of shrimp is not needed.
The dead shrimp must not be eaten. Once the lobster dies, the bacteria decompose immediately. People eat it, and it is easy to poison and have diarrhea. Moreover, lobster contains a large amount of histidine. When lobster dies, these histidines will quickly become toxic substances, which can easily cause food poisoning after human consumption. Only crayfish that died after being frozen can be eaten. It's not possible to die before it freezes. Most of the frozen crayfish are frozen directly when they are alive. Although the crayfish is dead, most of them have been frozen due to the low temperature, which will inhibit the growth of fungi and delay the deterioration of protein. After thawing, they can be cooked as soon as possible and edible.
The second is shrimp. For this. Look at the color of shrimp shells. White, blue and white is the best, do not redden, reddish is not fresh. Black is also bad.
Tips: Red shrimp in frozen shrimp can be red because it is boiled beforehand. After boiled, shrimp turns red because of astaxanthin in its body. The shrimp has been cooked and frozen for sale. But when you buy it home, you have to cook it, even if it's cooked, you can't eat it directly.
2. Look at the shape
Whether red shrimp or green shrimp, can be quickly identified by this method, that is, to see whether the head of the shrimp has fallen off, if the whole shrimp is relatively complete, head and tail are closely linked to the body, indicating that the shrimp is relatively fresh. The head of shrimp falls off, head and body, shell and meat are loosely connected, head and tail are easy to fall off or separate, which is not fresh.
Which nutrition is better, frozen shrimp or fresh shrimp?
It must be that fresh nutrition is better.
Frozen, mainly depends on the method of freezing and freezing time. Low temperature and quick freezing have little effect on food in a short time, and it is not easy to cause nutrient loss. However, with the increase of freezing time, nutrient will gradually lose. After all, food has a shelf life of up to three months. Taking fish as an example, some studies have shown that the loss of nutrients in fish, especially vitamin A and vitamin E, may be 20%-30% when stored at minus 18 C for 3 months. Vegetables and fruits should also be bought and eaten now, and vitamins will be reduced every day. And it's not freezing that keeps food from spoiling at all.
In addition, repeatedly frozen fish, shrimp and meat can lead to loss of nutrients and affect taste. In addition, the general preservation should be "quick freezing and slow freezing", that is, fast freezing and slow freezing. So, while the food is still fresh, eat it quickly. Don't wait until you have no nutrition. Fresh cells have the highest nutritional value, and at least they are active.