Shrimp can turn black when kept in the refrigerator for a long time.

Shrimp is high in protein and breaks down when kept for a long time. Producing black objects similar to eggs left out for a long time may be sulfur-containing compounds, which may affect your health if consumed in large quantities. After thawing, check the meat is not discolored and slack, if there is certainly can not be eaten. If it's not discolored or flabby, you can still eat it after cooking, but the taste is not very fresh.

Fresh shrimp shrimp meat eat very sweet, low fat content, is a lot of people like to eat food. Buy the shrimp eaten must be promptly placed in the refrigerator, so that it is not easy to be bad, but if you put the refrigerator in the freezer, and then take it out to deal with the shrimp is likely to be blackened, which is in fact the normal oxidation phenomenon, but put it for a long time will begin to rot Oh, so found blackened to eat as soon as possible Oh.

How to pick prawns:

1, look at the body shape of the shrimp is not curved

Fresh shrimp head and tail intact, the head and tail and the body are closely linked, the shrimp body is more quite, there is a certain degree of elasticity and curvature. And not fresh shrimp, head and body, shell and meat connected to the slack, head and tail easy to fall off or separate, can not maintain its original curvature.

The body of the organization is intact, the cells are filled with water, expansion and elasticity, so it can maintain the death of stretching or curling of the intrinsic state, that is, the use of external forces to make it change, such as external forces to stop, but still restored to the original posture. When the shrimp body after autolysis, tissue softening, the loss of this stretching force.

2, touch the shrimp body surface is dry

Fresh shrimp body appearance clean, solid, tender meat, feel hard when touched with your hands, elasticity, a sense of dryness. And when there is a lot of mucus seepage to the body surface feel slippery, on behalf of the shrimp has deteriorated, the head and feet off, meat loose shrimp, so you can not buy.

3, look at the color of the shrimp is bright

Fresh shrimp color is lime green, shrimp species are different, its color also varies slightly, but basically look very shiny, and in the sun's rays, there will be some transparent, and will be back out of some light. When the shrimp body deterioration decomposition, that is, and protein detachment and production of astaxanthin, so that the shrimp body reddish, if the shrimp shell color appears reddish or dark black, such shrimp is best not to buy, indicating that the shrimp has been placed for a long time.

Refer to Baidu Encyclopedia - Shrimp