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What makes you cry when slicing an onion?

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81 views asked May 16, 2014 in General by abbeymathew2000 (260 points)

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Onions make you cry because they contain Amino acid sulfoxides.when you cut an onion,a sufuric gas is released ,which makes your eyes tear.
answered Jun 18, 2014 by ajumathew (570 points)
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Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion. Recent studies from Japan, however, proved that lachrymatory-factor synthase, (a previously undiscovered enzyme) is the culprit (Imani et al, 2002).

The process goes as follows:

  1. Lachrymatory-factor synthase is released into the air when we cut an onion.
  2. The synthase enzyme converts the amino acids sulfoxides of the onion into sulfenic acid.
  3. The unstable sulfenic acid rearranges itself into syn-ropanethial-S-oxide.
  4. Syn-propanethial-S-oxide gets into the air and comes in contact with our eyes. The lachrymal glands become irritated and produces the tears!
answered May 24, 2017 by sasikiran (320 points)

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