鲜虾的美味十分诱人,但在虾头处时常能看到一些黑乎乎的东西,着实影响食欲。虾头为什么会变黑?这是什么“脏东西”吗,它是不是被污染了?虾头变黑的虾,还能吃么?其实,虾头变黑体现的是发生在虾体内的一种酶促反应,它和外界污染并没有什么关系。虾是否受到污染、是否重金属超标,这些通过肉眼观察可没法判断。动植物体内普遍存在一种叫酪氨酸酶的物质,虽然不同生物体中的酪氨 The deliciousness of shrimp is very attractive, but at the shrimp head can often see some dark things, really affect the appetite. Why is the shrimp head turned black? What is this “dirty stuff”? Is it contaminated? Shrimp head shrimp black, but also eat it? In fact, shrimp head black is reflected in the shrimp body An enzymatic reaction, it has nothing to do with the external pollution. Shrimp are contaminated, whether excessive heavy metals, these can be judged by the naked eye can not judge. Plants and animals commonly exist in the body called tyrosinase substances, although different organisms tyramine