双语早读|这样切洋葱,不容易流眼泪

葱属植物会有辛辣味,是因为其挥发性油脂中含有氨基酸亚砜这类有机分子。洋葱被切割的时候,会释放出“蒜胺酸酶”酵素,酵素再把氨基酸亚砜转成次磺酸,次磺酸再重组成SPSO这种物质。当眼睛的角膜沾到SPSO后产生的刺痛感,这就是洋葱会让人泪眼汪汪的原因!下面几个小窍门,让你在切洋葱时不再流泪。

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切洋葱前先冷藏或冷冻

根据研究所的说法,在切洋葱之前,先将它们放入冰箱30分钟,或放入冷冻室10到15分钟,便可以防止流泪,因为冷气能阻止其释放催泪气体。

According to the Institute, putting onions in the fridge 30 minutes or in the freezer for 10-15 minutes before chopping can prevent the stinging as the cold stops tear-jerking gas from being produced.

将洋葱浸泡在水中

减少洋葱释放气体的另一种方法是将其浸泡在水中——尽管这样可能会影响它的味道。

Another way to reduce the gas released by the onion is to soak in water - although this could compromise the taste.

最后切洋葱根部

洋葱生长时,与土壤中的硫混合,从而产生氨基酸亚砜。而洋葱被切成片时,这些亚砜会变成次磺酸,与酶反应后产生名为丙硫醛-S-氧化物的气体。

When an onion grows it mixes with sulfur in the soil to create amino acid sulfoxides. These sulfoxides turns into sulfenic acid when the onion is sliced which reacts with the enzymes to create a gas called syn-propanethial-S-oxide.

洋葱的根部是气体最集中的地方,所以建议,在切洋葱时最后切这一部分,以免刺激眼睛。

The root is where the fumes are most concentrated so it is recommended that this part of the onion is left on as you chop it to avoid stinging eyes.

在通风处切洋葱

另一种减少气体刺激眼睛的方法是在窗户边或者风扇旁切洋葱,这样气体就能从你面前被稀释或吹走。

Another way to reduce the gas’s effect on your eyes is to chop it next to a window or near a fan so the gas is diluted or blown away from your face.

来源:中国日报网英语点津

编辑:董静

审核:富文佳 王旭泉

【来源:中国日报网】

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