When onions are cut, their cells break open and release enzymes that react with sulfur compounds to produce syn-propanethial-S-oxide gas; this gas travels to the eyes and reacts with moisture to form a mild acid, triggering tear production as the body's protective response. To reduce tears, chill the onion first, use a sharp knife, or cut near running water.
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Why Cutting Onions Hurt๐ญ๐ง
Added:
Ever wondered why onions make your eyes burn and tear up? It's actually the onion's secret chemical defense system fighting back. When you cut an onion, its cells break open. Enzymes mix with sulfur compounds and create a gas called syn-propanethial-S-oxide.
That gas floats into your eyes and reacts with the natural water there, creating a mild acid. Your eyes respond by producing tears to wash it away. To reduce the tears, chill the onion first, use a sharp knife, or cut near running water.
Science makes cooking easier.
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