Why chopping onions make s u cry nd how to prevent it: Onion - TopicsExpress

Why chopping onions make s u cry nd how to prevent it: Onion contains the amino acid, sulfoxide. When u cut the onion, the cells break and release the amino acid which is converted to sulfenic acid by the enzyme, lachrymatory-factor synthase. Sulphenic acid rearranges itself to form syn-propanethiol S- oxide which reacts with the water on ur cornea to produce sulphuric acid. The burning sensation produced by sulphuric acid stimulates the lachrymal gland to produce tears to remove the irritant. To prevent it, Chill the onion b4 cutting to inactivate the enzymes or chop it under water to prevent tears. You can also wear protective glasses.

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