In general, the shrimp head blackened is a very common phenomenon, many people eat shrimp when this situation occurs, it is formed for a number of reasons, such as incorrect cooking methods, refrigeration freezing and so on.

What is the reason for the blackening of the shrimp head?

1, shrimp is not fresh: some restaurants seafood platter is easy to cover up the ingredients are not fresh, be careful.

2, refrigerated or frozen lead: shrimp in frozen, refrigerated conditions may also turn black, whether fresh can not be generalized.

3, shrimp extrusion collision: shrimp death, shrimp viscera in the handling, extrusion process is easy to break, so that shrimp after cooking, even before the pot to cook shrimp head as well as shrimp body will be black.

4, feed impact: shrimp eaten algae or feed can also affect the shrimp head color. In addition, shrimp in the starting catch, feed feed too much, and the day on the market for sale. Cooking in the case of feed has not been digested, shrimp are easy to blacken after cooking.

5, high-temperature cooking time is too long: In general, the shrimp pot at high temperatures will cook for one or two minutes, if the shrimp cooked on more than three minutes the internal organs are easy to rupture, but also easy to blacken the shrimp.

6, shrimp ingredients into melanin: tyrosine is enzymatically converted into quinones, and further into melanin.