Why do we usually get teras while cutting onions?

May 6, 2015, 16:00 IST

In this article you will get to know why do we usually get teras while cutting onions.

Q. Why do we usually get teras while cutting onions?

Ans. Onions contain amino acid- sulfoxides, which converts into sulfenic acids in the onion cells. On cutting the onion, the enzymes start  to mix with the sulfenic acid to form propanethiol S-oxide gas, which is a volatile gas, that reaches our eyes. This volatile gas then reacts with the water of the eyes, forming mild sulphuric acid; causing a burning sensation in our eyes. This burning sensation stimulates the tear glands to secrete tears in order to dilute and remove the irritant.

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