Shrimp head turned black, there are generally these three cases, the first case is caused by the substance of tyrosinase, the second is the shrimp is not fresh enough, and the third is the shrimp before being caught just eat a lot of dark-colored algae. Here's the scoop on ? What is the matter with the shrimp head turned black? The content, interested partners can continue to read down to understand.

1, tyrosinase substances caused by: shrimp body, there is a substance called tyrosinase, in the role of this substance, it can slowly form quinone substances, and then form the black substances such as eumelanin, brown melanin.

2, and the shrimp head position distribution of tyrosinase activity is the strongest, the abdomen and tail position distribution of tyrosinase activity is lower, so the shrimp head is the first black.

3, shrimp freshness is not enough: if the shrimp in the room temperature depending on the state of storage, then with the passage of time, the shrimp head is also black, then this situation is not fresh shrimp.

4, shrimp eat a lot of dark algae before being caught: if the shrimp is caught before eating a lot of dark algae, then the shrimp head is also black, and this shrimp can often be seen in the cooked frozen Arctic shrimp.

Shrimp put in the freezer to turn black is not poisonous, the reason is that most of the shrimp turn black is due to the enzyme tyrosinase substances, and if the shrimp turn black, and at the same time do not have a bad smell, then it can still be eaten.