煮鸡蛋的蛋黄表面为什么有时会呈灰绿色
文章来源:未知 文章作者:enread 发布时间:2021-09-10 04:48 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
鸡蛋的吃法有很多,水煮蛋是最常见的一种。水煮蛋烹饪简单,便于食用,高蛋白低热量,是一种健康营养的美味。细心的人可能会发现,煮鸡蛋的蛋黄表面有时会呈灰绿色。这是什么原因?这样的鸡蛋还能吃吗?
 
Some hard-boiled eggs have a gray or green ring of discoloration between the white and the yolk1, which might prompt you to wonder if the chicken in question had some exotic disease or whether the egg is safe to consume.
一些煮老了的鸡蛋蛋黄和蛋白相接触的一层表面会成灰色或绿色,有人可能会因此怀疑母鸡得病了,或者鸡蛋是否可以安全食用。
 
Good news: It is. The gray coloring appears due to a chemical reaction when boiling the egg. Proteins in the egg are held together by sulfur2, which breaks down in heat and becomes hydrogen sulfide. Iron in the egg yolk can alter it further so it becomes ferrous (iron) sulfide on the surface. Too much iron in your water can produce a similar result.
好消息:可以吃。煮鸡蛋时,蛋黄表面由于化学反应而呈现灰色。鸡蛋的蛋白质中含有硫元素,高温下蛋白质分解形成硫化氢。蛋黄中的铁元素会进一步与之发生反应,使其表面形成硫化亚铁。水中含铁过多也会导致类似的结果。
 
What does this have to do with the color? It's the iron sulfide that creates the gray (or green) rings around the egg, and that's usually a result of overcooking it. According to Sauder's Eggs, a crumbly, dry yolk takes about 14 minutes in boiling water. One way to avoid overcooking is to dip the cooked eggs in an ice bath immediately afterward3.
那这和蛋黄表面的颜色有什么关系呢?正是硫化亚铁让蛋黄表面呈现灰(绿)色,这通常是因为鸡蛋煮老了。据“索德鸡蛋”公司称,一个易碎的干蛋黄在沸水中大约需要煮14分钟。为避免过度烹煮,可以将煮熟的鸡蛋立即浸泡在冰水中。
 
If you do wind up overheating them, the eggs might be a little firmer than you'd like, but there's nothing about the color that indicates any food safety issue. The same holds for eggs that have speckling (brown spots) or bumps on the shells. So long as you use store-bought eggs within three weeks of purchase and cook the yolks until they're firm, you'll be good to go.
如果鸡蛋煮老了,口感可能会比你想的更硬一点,但是颜色并不能说明任何食品安全问题。蛋壳上有斑点(棕色斑点)或凸起的蛋也是如此。只要你的鸡蛋购买回来的时间不超过三周,并将蛋黄煮至变硬,就可以放心食用。


点击收听单词发音收听单词发音  

1 yolk BVTzt     
n.蛋黄,卵黄
参考例句:
  • This dish would be more delicious with some yolk powder.加点蛋黄粉,这道菜就会更好吃。
  • Egg yolk serves as the emulsifying agent in salad dressing.在色拉调味时,蛋黄能作为乳化剂。
2 sulfur ps4wC     
n.硫,硫磺(=sulphur)
参考例句:
  • Sulfur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。
  • Burning may produce sulfur oxides.燃烧可能会产生硫氧化物。
3 afterward fK6y3     
adv.后来;以后
参考例句:
  • Let's go to the theatre first and eat afterward. 让我们先去看戏,然后吃饭。
  • Afterward,the boy became a very famous artist.后来,这男孩成为一个很有名的艺术家。
TAG标签: color eggs gray
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片