A Fascinating Behind-the-Scenes Look at Why Do Onion Make You Cry?

A complex process takes place when you cut onion.

This results on the release of propanethial-S-oxide which is an irritant of the lachrymal glands, which release tears.

Upon cutting, onions release an enzyme called lachrymatory-factor synthase.

This enzyme transforms sulfoxides present in the onion into sulfenic acid.

Sulfenic acid gets spontaneously rearranged into propanethial-S-oxide

Which through the air, goes into your eye and irritates your 'lachrymal glands.

By-Vikash Bharal

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