Syn-propanethial-S-oxide
From Wikipedia, the free encyclopedia
| Syn-propanethial-S-oxide | |
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| IUPAC name | 1-Sulfinylpropane |
| Other names | Thiopropanal S-oxide |
| Identifiers | |
| CAS number | [32157-29-2] |
| PubChem | |
| SMILES | CCC=S=O |
| Properties | |
| Molecular formula | C3H6OS |
| Molar mass | 90.14 g mol-1 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Syn-propanethial-S-oxide is a volatile gas that triggers tears when an onion is cut. As onions are sliced, cells are broken, allowing enzymes called alliinases to break down amino acid sulfoxides and generate sulfenic acids . Sulfenic acids are unstable and spontaneously rearrange into syn-propanethial-S-oxide. The gas dissipates through the air and eventually reaches the eye, where it reacts with the water to form a dilute solution of sulfuric acid.[citation needed] This acid irritates the nerve endings in the eye, making them sting. Tear glands produce tears to dilute and flush out the irritant.[1]
[edit] Properties
Syn-propanethial-S-oxide has a chemical formula of C3H6OS.
[edit] See also
[edit] References
- ^ Scott, Thomas. What is the chemical process that causes my eyes to tear when I peel an onion?. Ask the Experts: Chemistry. Scientific American. Retrieved on 2007-04-28.
